I am writing a client database. I want to know the customer's name and hometown based on the customer number. When I enter number 2, I want to see Arya Stark, Edinburgh and when I enter number 1, I want to see Jon Snow, London. Why doesn't my program work? How to fix this?
package app;
import java.util.Scanner;
class Person {
String name;
String homeCity;
int customerNumber;
}
public class Customers {
static Scanner input = new Scanner(System.in);
public static void main(String[] args) {
String name;
System.out.print ("Give a customer card number: ");
name = input.next();
Person person1 = new Person();
person1.name = "Jon Snow";
person1.homeCity = "London";
person1.customerNumber = 1;
Person person2 = new Person();
person2.name = "Arya Stark";
person2.homeCity = "Edinburgh";
person2.customerNumber = 2;
System.out.println();
}
}
This should work:
class Person {
private String name;
private String homeCity;
private int customerNumber;
public Person(String name, String homeCity, int customerNumber) {
this.name = name;
this.homeCity = homeCity;
this.customerNumber = customerNumber;
}
public boolean isMatch(int num) {
return num == customerNumber;
}
#Override
public String toString() {
return name + " from " + homeCity;
}
}
import java.util.Scanner;
class Main {
private static Scanner input = new Scanner(System.in);
public static void main(String[] args) {
Person person1 = new Person("Jon Snow", "London", 1);
Person person2 = new Person("Arya Stark", "Edinburgh", 2);
while(true) {
System.out.print("Give a customer card number: ");
String num = input.next();
if (person1.isMatch(Integer.parseInt(num))) {
System.out.println(person1);
} else if (person2.isMatch(Integer.parseInt(num))) {
System.out.println(person2);
} else {
System.out.println("Not found");
}
}
}
}
here i have a code which i am giving u please correct my code and run it when i enter the extend or make object of attendence class in the student class then attendence class is not worked
import java.util.Scanner;
public class Attendence {
private int c;
public Attendence(){
}
public void project(){
System.out.println("Enter the total no of students of the class");
Scanner input=new Scanner(System.in);
int c=input.nextInt();
String[][] array=new String[c][6];
for(int i=0; i<c; i++){
for(int j=0;j<6;j++){
array[i][j]=input.next();
}}
System.out.println("RollNO \t Name \t Class \t Attendence Mark \tTeacher Name \tSubject Name");
for(int k=0; k<c; k++){
for(int l=0;l<6;l++){
System.out.print(array[k][l]+ "\t\t" );
}
System.out.println("\n");
}
}}
here this is second class
import java.util.Scanner;
public class student extends Attendence {
private int password;
private String ID;
public student(int passsword , String ID){
super();
this.password= password;
this.ID=ID;
}
public int getPassword() {
return password;
}
public void setPassword(int password) {
this.password = password;
}
public String getID() {
return ID;
}
public void setID(String iD) {
ID = iD;
}
public void mainfunction(){
Scanner input=new Scanner(System.in);
System.out.println("enter the password");
int password=input.nextInt();
System.out.println("enter the ID");
String ID=input.next();
if(password==123 || ID=="abc"){
System.out.println("u enter right password and ID so you can acess the Attendance sheet");
}
else
System.out.println("u enter wrong password and ID so you can't acess the Attendance sheet");
}
#Override
public String toString(){
return this.getPassword()+ this.getID()+super.toString();
}
public static void main(String[] args) {
Attendence z = new Attendence();
student a=new student(123, "abc");
//a.mainfunction();
a.mainfunction();
z.project();
}
}
Call the Attendance class in if loop(if password and ID is correct)..and close the input(Scanner) object..
Student.class
import java.util.Scanner;
public class Student extends Attendence {
private int password;
private String ID;
public Student(int passsword, String ID) {
super();
this.ID = ID;
}
public static void main(String[] args) {
Student a = new Student(123, "abc");
a.mainfunction();
}
public void mainfunction() {
Scanner input = new Scanner(System.in);
System.out.println("enter the password");
int password = input.nextInt();
System.out.println("enter the ID");
String ID = input.next();
if (password == 123 || ID == "abc") {
System.out.println("u enter right password and ID so you can acess the Attendance sheet");
Attendence z = new Attendence();
z.project();
} else {
System.out.println("u enter wrong password and ID so you can't acess the Attendance sheet");
}
input.close();
}
#Override
public String toString() {
return this.getPassword() + this.getID() + super.toString();
}
public int getPassword() {
return password;
}
public void setPassword(int password) {
this.password = password;
}
public String getID() {
return ID;
}
public void setID(String iD) {
ID = iD;
}
}
Attendance.class
import java.util.Scanner;
public class Attendence {
public void project() {
System.out.println("Enter the total no of students of the class");
Scanner input = new Scanner(System.in);
Integer c = input.nextInt();
String[][] array = new String[c][6];
for (int i = 0; i < c; i++) {
System.out.println("Enter the Roll No,Name,Class,Attendance Mark,Teacher Name,Student Name for student "+(i+1));
for (int j = 0; j < 6; j++) {
array[i][j] = input.next();
}
}
System.out.println("RollNO \t Name \t Class \t Attendence Mark \tTeacher Name \t Subject Name");
for (int k = 0; k < c; k++) {
for (int l = 0; l < 6; l++) {
System.out.print(array[k][l] + "\t\t");
}
System.out.println("\n");
}
input.close();
}
}
It is working as expected.
I tried to execute your code got following output . check it this is what you expect.
enter the password
123
enter the ID
abc
u enter right password and ID so you can acess the Attendance sheet
Enter the total no of students of the class
1
2
xyz
2
2
2
abc
RollNO Name Class Attendence Mark Teacher Name S
ubject Name
2 xyz 2 2 abc
or else ask precisely what you exactly want.
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Scanner;
import java.util.Set;
class Employee
{
private String Id;
private String Name;
private String Department;
private String Salary;
public Employee(String Id, String Name, String Department,
String Salary)
{
this.Id=Id;
this.Name=Name;
this.Department=Department;
this.Salary=Salary;
}
public String getId() {
return Id;
}
public void setId(String id) {
Id = id;
}
public String getName() {
return Name;
}
public void setName(String name) {
Name = name;
}
public String getDepartment() {
return Department;
}
public void setDepartment(String department) {
Department = department;
}
public String getSalary() {
return Salary;
}
public void setSalary(String salary) {
Salary = salary;
}
public String toString()
{
return this.Id+"\t"+this.Name+"\t\t"+this.Department+"\t\t\t"+this.Salary;
}
}
public class Assignment4
{
public static void main(String[] args)
{
try {
Map< String, List<Employee> > m=new HashMap< String, List<Employee> >();
List<Employee> ListForFinance=new ArrayList<Employee>();
Scanner scn1=new Scanner(System.in);
String Id;
String Name;
String Department;
String Salary;
while(true)
{
System.out.print("\nThe Choices:\n1>add\n2>modification\n3>remove\n4>display\n\n");
System.out.println("Enter the choice: ");
System.out.println("To quit type -1");
int num=scn1.nextInt();
if(num == -1)
{
break;
}
switch(num)
{
case 1:
{
System.out.print("\nDepartment: ");
Department=scn1.next();
System.out.print("\nId: ";
Id=scn1.next();
System.out.print("\nName: ");
Name=scn1.next();
System.out.print("\nSalary: ");
Salary=scn1.next();
Employee employee1=new Employee(Id,Name,Department,Salary);
ListForFinance.add(employee1);
m.put(Department, ListForFinance);
break;
}
case 2:
{
System.out.println("Type Department to be modified");
Department=scn1.next();
System.out.println("Modification values");
System.out.print("\nId: ");
Id=scn1.next();
System.out.print("\nName: ");
Name=scn1.next();
System.out.print("\nSalary: ";
Salary=scn1.next();
Set<String> s=m.keySet();
Iterator<String> i=s.iterator();
Employee employee1=new Employee(Id,Name,Department,Salary);
m.get(Department.setId("Id");
ListForFinance.add(employee1);
m.put(Department, ListForFinance);
while(i.hasNext())
{
System.out.println(i.next());
}
break;
}
case 3:
{
System.out.println("=========================================================");
System.out.println("ID"+"\t"+"NAME"+"\t\t"+"DEPARTMENT"+"\t\t"+"SALARY");
System.out.println("=========================================================");
Set<String> s=m.keySet();
Iterator<String> i=s.iterator();
while(i.hasNext())
{
String dept=i.next();
List<Employee> employees=m.get(dept);
for(int j=0;j<employees.size();j++)
{
System.out.print("\n"+employees.get(j)+"\n\n");
}
}
break;
}
}
}
}
catch(Exception e)
{
System.out.println("NOTE: \n"+"Please enter specified key format..!!!");
System.out.println("======================================");
System.out.println("Now you are Signing out");
System.out.println("Thank You,Login Again");
System.out.println("======================================");
}
}
}
default:
System.out.println("=============================================================";
System.out.print("Wrong key Pressed,please enter the correct key\n";
System.out.println("Try again...!!!";
System.out.println("=============================================================";
}
}
}
Please find how to enter employee details,update,remove,displaying using hashmap wherin employee dept is taken as a key and id,name,salary is stored in the values using arraylist ......Currently Iam struck at CASE 2...PLease help me out
In CASE 1 i am trying to insert the employee details and in CASE 2 iam trying to modify the values .If i try to put any details with the same Dept it should create new entry...Even i should able to modify it,i am not getting how to do..PLease help me out
Your question is not clear,
For setting employee in list
Arraylist<Employee> list = new ArrayList<Employees>;
Employee emp = new Employee();
emp.setname("John");
emp.setEmpCode(1);
list.add(emp);
For getting employee from list just use this.
Employee emp = list.getItem(0);// change 0 to your position or make a loop to get all employees
import java.util.*; import java.util.concurrent.TimeUnit;
class Employee{
public String name; public String city; public String email; public String phone; public String age;`enter code here`
public Employee(String name,String city,String email,String age,String phone) { super(); this.name = name; this.city=city; this.email = email; this.age=age; this.phone = phone; }
public String getPhone() { return phone; }
public String getAge() { return age; }
public String getName() { return name; } public String getEmail() { return email; } public String getAddress() { return city; } public void setPhone(String phone) { this.phone = phone; } }
public class Display_Employee implements Comparator {
/* public int compare(Employee o1, Employee o2) { // in the case if when age is Integer return o1.getAge() - o2.getAge(); }*/ /public int compare(Employee o1, Employee o2) { //for short by Name return o1.getFirstName().compareTo(o2.getFirstName()); }/ public int compare(Employee o1, Employee o2) { //for short by Name return o1.getAge().compareTo(o2.getAge()); } public static void main(String[] args) throws Exception { int choice,i,size,mob_serch_result,email_serch_result; String name,city,email,phone,age,mob_serch,email_serch,update_search,choice_update,update_search_email; String name1,city1,email1,phone1,age1;
Scanner sc = new Scanner(System.in);
// Map< String, List > mapPhone=new HashMap< String, List >(); // Map< String, List > mapEmail=new HashMap< String, List >(); Map< String, Integer > mapEmail=new HashMap< String, Integer >(); Map< String, Integer > mapPhone=new HashMap< String, Integer >(); List list = new ArrayList(); //User Input /*System.out.println("How much details you want to Enter"); size=sc.nextInt() ; for(i=0;i<size;i++) {
System.out.println("\t\t\t\tEnter the "+(i+1)+" Employee Details \t\t\t\t\n"); System.out.println("Enter the name "); name=sc.next(); System.out.println("Enter the City "); city=sc.next(); System.out.println("Enter the email "); email=sc.next(); System.out.println("Enter the age "); age=sc.next(); System.out.println("Enter the MobNum "); phone=sc.next(); Employee employee=new Employee(name,city,email,age,phone); list.add(employee); mapPhone.put(phone,i); mapEmail.put(email,i); }*/
//Testing input Employee employee1=new Employee("Raj","Mumbai","raj#yahoo.com","27","7499031600"); list.add(employee1); phone="7499031600"; email="raj#yahoo.com"; mapPhone.put(phone,0); mapEmail.put(email,0); Employee employee2=new Employee("Rekha","Chennai","rekha#hotmail.com","24","9598551664"); list.add(employee2); phone1="9598551664"; email1="rekha#hotmail.com"; mapPhone.put(phone1,1); mapEmail.put(email1,1); Employee employee3=new Employee("Ram","Siliguri","ram#outlook.com","55","8563878480"); list.add(employee3); String phone2="8563878480"; String email2="ram#outlook.com"; mapPhone.put(phone2,2); mapEmail.put(email2,2); Employee employee4=new Employee("Lakhan","Bhopal","Lakhan#outlook.com","30","8563050698"); list.add(employee4); String phone3="8563050698"; String email3="Lakhan#outlook.com"; mapPhone.put(phone3,3); mapEmail.put(email3,3); Employee employee5=new Employee("Bharat","Ayodhya","Bharat#outlook.com","35","9044669201"); list.add(employee5); String phone4="9044669201"; String email4="Bharat#outlook.com"; mapPhone.put(phone4,4); mapEmail.put(email4,4 );
for (Employee s : list) { System.out.println("\n\n"+s.getName()+" " +s.getAddress()+" " +s.getAge()+" " +s.getEmail()+" " +s.getPhone()); } /Seaching part/ while(true) { System.out.println("==========================================================================================================="); System.out.println("Press 1 for Sort by age\nPress 2 for find the Person by mobile number\nPress 3 for find the Person by email\nPress 4 for update the mobiel number"); choice= sc.nextInt(); sc.nextLine(); switch(choice) { case 1: Collections.sort(list, new Display_Employee ()); for (Employee s : list) { System.out.println(" Name : "+s.getName()+" City : " +s.getAddress()+" Age : " +s.getAge()+" Email : " +s.getEmail()+" Phone : " +s.getPhone()); } System.out.println("===========================================================================================================");
break;
/*case 1 is Running perfectly*/
case 2:
System.out.println("Enter the mobiel number of Employee ");
mob_serch=sc.next();
mob_serch_result=mapPhone.get(mob_serch);
System.out.println("Mobile mob_serch_result is "+mob_serch_result);
Employee Emp_phone_obj=(Employee)list.get(mob_serch_result);
System.out.println("Employee Name: "+Emp_phone_obj.getName()+" Email : "+Emp_phone_obj.getEmail()+" Age : "+Emp_phone_obj.getAge()+" City : "+Emp_phone_obj.getAddress());
break; /*case 2 is Running perfectly*/
case 3:
System.out.println("Enter the emailId of Employee ");
email_serch=sc.nextLine();
email_serch_result=mapEmail.get(email_serch);
System.out.println("Email_serch_result is "+email_serch_result);
Employee Emp_email_obj=(Employee)list.get(email_serch_result);
System.out.println("Employee Name : "+Emp_email_obj.getName()+" Email : "+Emp_email_obj.getEmail()+" Age : "+Emp_email_obj.getAge()+" City : "+Emp_email_obj.getAddress());
break;
case 4:
System.out.println("Enter the mobile number ");
update_search= sc.next();
mob_serch_result=mapPhone.get(update_search);
Employee Emp_update_obj=(Employee)list.get(mob_serch_result);
update_search_email=Emp_update_obj.getEmail();
System.out.println("\t\t\t\t\t\t\tYour Search Result");
System.out.println(" Name: "+Emp_update_obj.getName()+" Email : "+Emp_update_obj.getEmail()+" Age : "+Emp_update_obj.getAge()+" City : "+Emp_update_obj.getAddress());
System.out.println("\t\t\t\t\t\t\tPress Y or y for Confirm and Update\tPress N or n for Cancle");
choice_update=sc.next();
if(choice_update.equalsIgnoreCase("Y")||choice_update.equalsIgnoreCase("y"))
{
mapPhone.remove(update_search);
mapEmail.remove(update_search_email);
list.remove(Emp_update_obj);
System.out.println("Enter the Firstname ");
name1=sc.next();
System.out.println("Enter the City ");
city1=sc.next();
System.out.println("Enter the email ");
email1=sc.next();
System.out.println("Enter the age ");
age1=sc.next();
System.out.println("Enter the MobNum ");
phone1=sc.next();
Employee employee=new Employee(name1,city1,email1,age1,phone1);
list.add(employee);
mapPhone.put(phone1, mob_serch_result);
mapEmail.put(email1, mob_serch_result);
}
break;
default:
System.out.println("\n\t****Please give a valid Input****\t\n");
break;
} }
}//End of main() method }//end of DisplayArrayList class
import java.util.*;
import java.util.concurrent.TimeUnit;
class Employee implements Comparator<Employee> {
private String name;
private String city;
private String email;
private String phone;
private int age;
public Employee(){}
public void setAge(Integer age) {
this.age = age;
}
public void setName(String Name) {
this.name = Name;
}
public void setEmail(String email) {
this.email = email;
}
public void setPhone(String phone) {
this.phone=null;
this.phone = phone;
}
public void setCity(String city) {
this.city = city;
}
public String getPhone() {
return phone;
}
public int getAge() {
return age;
}
public String getName() {
return name;
}
public String getEmail() {
return email;
}
public String getAddress() {
return city;
}
public int compare(Employee o1, Employee o2) { // in the case if when age is Integer
return o1.getAge() - o2.getAge();
}
}
public class Display_Employee {
public static void main(String[] args)
{
int choice,i,size,mob_serch_result,email_serch_result,age,age1;
String name,city,email,phone,mob_serch,email_serch,update_search,choice_update,update_search_email;
String name1,city1,email1,phone1,Update_choice,choice_update_for_phone,choice_update_for_email;
Scanner sc = new Scanner(System.in);
Map< String, Integer > mapEmail=new HashMap< String, Integer >();
Map< String, Integer > mapPhone=new HashMap< String, Integer >();
List<Employee> list = new ArrayList<Employee>();
/*
System.out.println("How much details you want to Enter");
size=sc.nextInt() ;
for(i=0;i<size;i++)
{
System.out.println("\t\t\t\tEnter the "+(i+1)+" Employee Details \t\t\t\t\n");
System.out.println("Enter the name ");
name=sc.next();
System.out.println("Enter the City ");
city=sc.next();
System.out.println("Enter the email ");
email=sc.next();
System.out.println("Enter the age ");
age=sc.nextInt();
System.out.println("Enter the MobNum ");
phone=sc.next();
Employee employee=new Employee();
employee.setAge(age);
employee.setName(name);
employee.setCity(city);
employee.setPhone(phone);
employee.setEmail(email);
list.add(employee);
mapPhone.put(phone,i);
mapEmail.put(email,i);
}*/
/*Test input Start*/
name="Anoop";
city="kanpur";
email="anoop#gmail.com";
age=23;
phone="9415418279";
Employee employee=new Employee();
employee.setAge(age);
employee.setName(name);
employee.setCity(city);
employee.setPhone(phone);
employee.setEmail(email);
list.add(employee);
mapPhone.put(phone,0);
mapEmail.put(email,0);
/*Test input end*/
for (Employee s : list)
{
System.out.println("\n\n"+s.getName()+" " +s.getAddress()+" " +s.getAge()+" " +s.getEmail()+" " +s.getPhone());
}
while(true)
{
System.out.println("===========================================================================================================");
System.out.println("Press 1 for Sort by age\nPress 2 for find the Person by mobile number\nPress 3 for find the Person by email\nPress 4 for update the mobiel number\nPress 5 for print list and free the varible ");
choice= sc.nextInt();
sc.nextLine();
switch(choice)
{
case 1:
Collections.sort(list,new Employee());
for (Employee s : list)
{
System.out.println(" Name : "+s.getName()+" City : " +s.getAddress()+" Age : " +s.getAge()+" Email : " +s.getEmail()+" Phone : " +s.getPhone());
}
System.out.println("===========================================================================================================");
break;
case 2:
System.out.println("Enter the mobile number of Employee ");
mob_serch=sc.next();
mob_serch_result=mapPhone.get(mob_serch);
System.out.println("Mobile mob_serch_result is "+mob_serch_result);
Employee Emp_phone_obj=(Employee)list.get(mob_serch_result);
System.out.println("Employee Name: "+Emp_phone_obj.getName()+" Email : "+Emp_phone_obj.getEmail()+" Age : "+Emp_phone_obj.getAge()+" City : "+Emp_phone_obj.getAddress());
break;
case 3:
System.out.println("Enter the emailId of Employee ");
email_serch=sc.nextLine();
email_serch_result=mapEmail.get(email_serch);
System.out.println("Email_serch_result is "+email_serch_result);
Employee Emp_email_obj=(Employee)list.get(email_serch_result);
System.out.println("Employee Name : "+Emp_email_obj.getName()+" Email : "+Emp_email_obj.getEmail()+" Age : "+Emp_email_obj.getAge()+" City : "+Emp_email_obj.getAddress());
break;
case 4:
System.out.println("\033[H\033[2J"+"\n\n\t\t\tPress P to Edit PhoneNumber & Press E for Edit Email ");
choice_update_for_phone=sc.next();
choice_update_for_email=choice_update_for_phone;
if(choice_update_for_phone.equalsIgnoreCase("P")||choice_update_for_phone.equalsIgnoreCase("p"))
{
System.out.println("Enter the Old Mobile number ");
update_search=sc.next();
mob_serch_result=mapPhone.get(update_search);
System.out.println(" mob_serch_result "+mob_serch_result);
Employee Emp_update_obj_phone=(Employee)list.get(mob_serch_result);
System.out.println("\t\t\t\t\t\t\tYour Search Result");
System.out.println(" Name: "+Emp_update_obj_phone.getName()+" Email : "+Emp_update_obj_phone.getEmail()+" Age : "+Emp_update_obj_phone.getAge()+" City : "+Emp_update_obj_phone.getAddress());
System.out.println("\t\t\t\tPress Y or y for Confirm and Update\tPress N or n for Cancle");
choice_update=sc.next();
if(choice_update.equalsIgnoreCase("Y")||choice_update.equalsIgnoreCase("y"))
{
System.out.println("Enter the New MobNum ");
phone1=sc.next();
Emp_update_obj_phone.setPhone(phone1);
System.out.println("\t\t\t\tupdated entry is :\n");
mapPhone.put(phone1,mob_serch_result); //Map update
System.out.println(" Name: "+Emp_update_obj_phone.getName()+" Email : "+Emp_update_obj_phone.getEmail()+" Age : "+Emp_update_obj_phone.getAge()+" City : "+Emp_update_obj_phone.getAddress()+" PhoneNumber : "+Emp_update_obj_phone.getPhone());
}
}
else if(choice_update_for_email.equalsIgnoreCase("e")||choice_update_for_email.equalsIgnoreCase("E"))
{
System.out.println("Enter the old email ");
update_search_email= sc.next();
email_serch_result=mapEmail.get(update_search_email);
System.out.println(" email_serch_result = "+ email_serch_result);
Employee Emp_update_obj_email=(Employee)list.get(email_serch_result);
System.out.println("\t\t\t\t\t\t\tYour Search Result");
System.out.println(" Name: "+Emp_update_obj_email.getName()+" Email : "+Emp_update_obj_email.getEmail()+" Age : "+Emp_update_obj_email.getAge()+" City : "+Emp_update_obj_email.getAddress());
System.out.println("\t\t\t\t\t\t\tPress Y or y for Confirm and Update\tPress N or n for Cancle");
choice_update=sc.next();
if(choice_update.equalsIgnoreCase("Y")||choice_update.equalsIgnoreCase("y"))
{
System.out.println("Enter the new email ");
email1=sc.next();
Emp_update_obj_email.setEmail(email1);
mapEmail.put(email1,email_serch_result);
}
}
break;
case 5:
Iterator<Employee> itr=list.iterator();
while(itr.hasNext())
{
Employee employe = itr.next();
System.out.print(" name: "+employe.getName());
System.out.print(" email: "+employe.getEmail());
System.out.print(" age: "+employe.getAge());
System.out.println(" phone: "+employe.getPhone());
}
System.gc();
break;
default:
System.out.println("\n\t****Please give a valid Input****\t\n");
break;
}
}
}//End of main() method
}//end of DisplayArrayList class
I'm trying to write a program using a Map to map the details of an employee with the hobbies of the employee. The program should take the details of the employee and his/her hobbies as input and then store them as key/value pair in the map. Once the addition of details is complete, then the user should be able to list down all the employees, along with their hobbies and also should be able to view a particular employee's (by giving employee id as input), details and his/her hobbies . Also the user should be able to delete an employee based on the id of the employee.
I have tried as follows. But the method 'deleteEmployee()', 'isEmployeePresent()' and 'displayEmployees()' are erroneous
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
import java.util.Scanner;
class Employee {
String designation, name;
Date dob;
int employeeID;
float salary;
public Employee(String designation, Date dob, int employeeID, String name,
float salary) {
this.designation = designation;
this.dob = dob;
this.employeeID = employeeID;
this.name = name;
this.salary = salary;
}
public String getDesignation() {
return designation;
}
public Date getDob() {
return dob;
}
public int getEmployeeID() {
return employeeID;
}
public String getName() {
return name;
}
public float getSalary() {
return salary;
}
public void setDesignation(String designation) {
this.designation = designation;
}
public void setDob(Date dob) {
this.dob = dob;
}
public void setEmployeeID(int employeeID) {
this.employeeID = employeeID;
}
public void setName(String name) {
this.name = name;
}
public void setSalary(float salary) {
this.salary = salary;
}
}
class Hobby {
String hobbyDescription, hobbyName;
public Hobby(String hobbyName, String hobbyDescription) {
this.hobbyName = hobbyName;
this.hobbyDescription = hobbyDescription;
}
public String getHobbyName() {
return hobbyName;
}
public String getHobbyDescription() {
return hobbyDescription;
}
public void setHobbyName() {
this.hobbyName = hobbyName;
}
public void setHobbyDescription() {
this.hobbyDescription = hobbyDescription;
}
}
public class EmployeeManagement {
public static void main(String args[]) {
HashMap<Employee, Hobby> hm1 = new HashMap<Employee, Hobby>();
Scanner sc1 = new Scanner(System.in);
System.out.println("How many names do you want to add to the system? ");
int w = sc1.nextInt();
EmployeeManagement ob = new EmployeeManagement();
ob.addEmployees(w, hm1);
ob.displayEmployees(hm1);
while (true) {
System.out.println("1. Delete an employee");
System.out
.println("2. Check whether an employee is present or not");
System.out.println("3. Break the loop and terminates the program");
int ch = sc1.nextInt();
switch (ch) {
case 1:
System.out.println("Enter Employee-I'd:");
int p = sc1.nextInt();
ob.deleteEmployee(p, hm1);
ob.displayEmployees(hm1);
break;
case 2:
System.out.println("Enter Employee-I'd:");
int q = sc1.nextInt();
boolean b = ob.isEmployeePresent(q, hm1);
if (b == true)
System.out.println("The employee is present");
else
System.out.println("The employee is not present");
break;
case 3:
return;
}
}
}
public void addEmployees(int n, Map<Employee, Hobby> abc) {
Scanner sc = new Scanner(System.in);
Employee[] obj1 = new Employee[n];
Hobby[] obj2 = new Hobby[n];
for (int i = 0; i < n; i++) {
System.out.println("Enter Employee name:");
String nm = sc.next();
System.out.println("Enter designation:");
String des = sc.next();
System.out.println("Enter employeeI-D:");
int eId = sc.nextInt();
System.out.println("Enter salary:");
double sl1 = sc.nextDouble();
float sl = (float) sl1;
System.out.println("Enter Hobby-name:");
String hnm = sc.next();
System.out.println("Enter Hobby-description");
String hdes = sc.next();
System.out.println("Enter date-of-birth:");
String dt1 = sc.next();
SimpleDateFormat formatter = new SimpleDateFormat("dd/MM/yyyy");
try {
Date dt = formatter.parse(dt1);
obj1[i] = new Employee(des, dt, eId, nm, sl);
obj2[i] = new Hobby(hnm, hdes);
} catch (ParseException e) {
e.printStackTrace();
}
abc.put(obj1[i], obj2[i]);
}
}
public void deleteEmployee(int id, Map<Employee, Hobby> m1) {
if (m1.containsKey((Employee.getEmployeeID()) == id))
m1.remove(Employee);
}
public boolean isEmployeePresent(int id, Map<Employee, Hobby> m2) {
if (m2.containsKey((Employee.getEmployeeID()) == id))
return true;
else
return false;
}
public void displayEmployees(Map<Employee, Hobby> hm) {
for (Map.Entry<Employee, Hobby> m : hm.entrySet()) {
System.out.println(m.getKey() + " " + m.getValue());
}
}
}
You're triying to access Employee methods in a static way:
if(m1.containsKey((Employee.getEmployeeID())==id))
// ↑ here
You must get the instances of Employee inside the map and then compare with the id given:
public void deleteEmployee(int id,Map<Employee,Hobby> m1) {
// iterate in the map searching for the id
for (Entry<Employee, Hobby> entry : map.entrySet()) {
Employee e = entry.getKey(); // here you have the employee
Hobby h = entry.getValue(); // here you have the hobby
// check if this employee have same id than given
if(e.getEmployeeID() == id) { // map contains the employee
m1.remove(e);
}
}
NOTES:
I would recommend to return a boolean to check if employee has been updated, deleted, etc... public boolean deleteEmployee(int id,Map<Employee,Hobby> m1)
I would keep the employees in another way, HashMap does not allow duplicates, so you cannot save more than one Hobby in each employee if you don't declare it like HashMap<Employee, List<Hobby>>.
I am trying to retrieve every record that an arraylist contains. I have a class called ContactList which is the super class of another class called BusinessContacts. My first task is to print only the first name and last name of a contact. The second task is to print details of a contact that's related to its id number. The ContactList class has all the instance variables and the set/get methods and the toString() method. The BusinessContact class consists of only two instance variables that need to be appended to the ContactList class. How is can this be worked out? The code is below:
The ContactList class:
package newcontactapp;
public abstract class ContactList {
private int iD;
private String firstName;
private String lastName;
private String adDress;
private String phoneNumber;
private String emailAddress;
// six-argument constructor
public ContactList(int id, String first, String last, String address, String phone, String email) {
iD = id;
firstName = first;
lastName = last;
adDress = address;
phoneNumber = phone;
emailAddress = email;
}
public ContactList(){
}
public void displayMessage()
{
System.out.println("Welcome to the Contact Application!");
System.out.println();
}
public void displayMessageType(String type)
{
System.out.println("This is a " + type);
System.out.println();
}
public int getiD() {
return iD;
}
public void setiD(int id) {
iD = id;
}
public String getFirstName() {
return firstName;
}
public void setFirstName(String first) {
firstName = first;
}
public String getLastName() {
return lastName;
}
public void setLastName(String last) {
lastName = last;
}
public String getAdDress() {
return adDress;
}
public void setAdDress(String address) {
adDress = address;
}
public String getPhoneNumber() {
return phoneNumber;
}
public void setPhoneNumber(String phone) {
phoneNumber = phone;
}
public String getEmailAddress() {
return emailAddress;
}
public void setEmailAddress(String email) {
emailAddress = email;
}
public String toString(){
return getiD() + " " + getFirstName() + " " + getLastName() + " " + getAdDress() + " " + getPhoneNumber() + " " + getEmailAddress() + "\n" ;
}
}
The BusinessContacts class:
package newcontactapp;
public class BusinessContacts extends ContactList {
private String jobTitle;
private String orGanization;
//
public BusinessContacts(int id, String first, String last, String address, String phone, String email, String job, String organization){
super();
jobTitle = job;
orGanization = organization;
}
public BusinessContacts(){
}
public String getJobTitle() {
return jobTitle;
}
public void setJobTitle(String job) {
jobTitle = job;
}
public String getOrGanization() {
return orGanization;
}
public void setOrGanization(String organization) {
orGanization = organization;
}
//#Override
public String toString(){
return super.toString()+ " " + getJobTitle()+ " " + getOrGanization() + "\n";
}
}
Here is my main method class:
package newcontactapp;
import java.util.ArrayList;
//import java.util.Iterator;
import java.util.Scanner;
public class NewContactAppTest {
//ArrayList<ContactList> fullList = new ArrayList<>();
ArrayList<ContactList> bContacts = new ArrayList<>();
ArrayList<ContactList> pContacts = new ArrayList<>();
public static void main(String [] args)
{
ContactList myContactList = new ContactList() {};
myContactList.displayMessage();
new NewContactAppTest().go();
}
public void go()
{
ContactList myContactList = new ContactList() {};
System.out.println("Menu for inputting a Business Contact or Personal Contact");
System.out.println();
Scanner input = new Scanner(System.in);
System.out.println("Please enter a numeric choice below: ");
System.out.println();
System.out.println("1. Add a Business Contact");
System.out.println("2. Add a Personal Contact");
System.out.println("3. Display Contacts");
System.out.println("4. Quit");
System.out.println();
String choice = input.nextLine();
if(choice.contains("1")){
String type1 = "Business Contact";
myContactList.displayMessageType(type1);
businessInputs();
}
else if(choice.contains("2")){
String type2 = "Personal Contact";
myContactList.displayMessageType(type2);
personalInputs();
}
else if(choice.contains("3")) {
displayContacts();
displayRecord();
}
else if(choice.contains("4")){
endOfProgram();
}
}
public void businessInputs()
{
BusinessContacts myBcontacts = new BusinessContacts();
//ContactList myContactList = new ContactList() {};
//ContactList nameContacts = new ContactList() {};
bContacts.clear();
int id = 0;
myBcontacts.setiD(id);
Scanner in = new Scanner(System.in);
while(true){
id = id + 1;
myBcontacts.setiD(id);
//myContactList.setiD(id);
System.out.println("Enter first name ");
String firstName = in.nextLine();
//nameContacts.setFirstName(firstName);
//myContactList.setFirstName(firstName);
myBcontacts.setFirstName(firstName);
System.out.println("Enter last name: ");
String lastName = in.nextLine();
//nameContacts.setLastName(lastName);
//myContactList.setLastName(lastName);
myBcontacts.setLastName(lastName);
System.out.println("Enter address: ");
String address = in.nextLine();
//myContactList.setAdDress(address);
myBcontacts.setAdDress(address);
System.out.println("Enter phone number: ");
String phoneNumber = in.nextLine();
//myContactList.setPhoneNumber(phoneNumber);
myBcontacts.setPhoneNumber(phoneNumber);
System.out.println("Enter email address: ");
String emailAddress = in.nextLine();
//myContactList.setEmailAddress(emailAddress);
myBcontacts.setEmailAddress(emailAddress);
System.out.println("Enter job title: ");
String jobTitle = in.nextLine();
myBcontacts.setJobTitle(jobTitle);
System.out.println("Enter organization: ");
String organization = in.nextLine();
myBcontacts.setOrGanization(organization);
//bContacts.add(myContactList);
bContacts.add(myBcontacts);
//names.add(nameContacts);
//System.out.println("as entered:\n" + bContacts);
System.out.println();
System.out.println("Enter another contact?");
Scanner input = new Scanner(System.in);
String choice = input.nextLine();
if(choice.equalsIgnoreCase("Y")) {
continue;
}
else{
break;
}
}
//bContacts.add(myBcontacts);
go();
}
public void personalInputs(){
ContactList myContactList = new ContactList() {};
PersonalContacts myPcontacts = new PersonalContacts();
Scanner in = new Scanner(System.in);
int id;
id = 1;
while(true){
System.out.println("Enter first name; ");
String firstName = in.nextLine();
myContactList.setFirstName(firstName);
myPcontacts.setFirstName(firstName);
System.out.println("Enter last name: ");
String lastName = in.nextLine();
myContactList.setLastName(lastName);
myPcontacts.setLastName(lastName);
System.out.println("Enter address: ");
String address = in.nextLine();
myContactList.setAdDress(address);
myPcontacts.setAdDress(address);
System.out.println("Enter phone number: ");
String phoneNumber = in.nextLine();
myContactList.setPhoneNumber(phoneNumber);
myPcontacts.setPhoneNumber(phoneNumber);
System.out.println("Enter email address: ");
String emailAddress = in.nextLine();
myContactList.setEmailAddress(emailAddress);
myPcontacts.setEmailAddress(emailAddress);
System.out.println("Enter birth date");
String dateOfBirth = in.nextLine();
myPcontacts.setDateOfBirth(dateOfBirth);
//pContacts.add(myContactList);
pContacts.add(myPcontacts);
id = id + 1;
myContactList.setiD(id);
System.out.println();
System.out.println("Enter another contact?");
Scanner input = new Scanner(System.in);
String choice = input.nextLine();
if (choice.equalsIgnoreCase("y")) {
continue;
}
else{
break;
}
}
go();
}
public void displayContacts(){
System.out.println();
for(ContactList name : bContacts){
System.out.println(name.getiD() + " " + name.getFirstName()+ " " + name.getLastName());
}
}
public void displayRecord(){
System.out.println();
System.out.println("Do you wish to see details of contact?");
Scanner input = new Scanner(System.in);
String choice = input.nextLine();
if(choice.equalsIgnoreCase("Y")) {
System.out.println();
System.out.println("Enter the numeric key from the list to see more specific details of that record");
System.out.println();
Scanner key = new Scanner(System.in);
System.out.println();
ContactList record = new ContactList() {};
for(int i = 0; i < bContacts.size(); i++){
record = bContacts.get(i);
System.out.println(record.toString());
}
}
else{
go();
}
/* else{
System.out.println();
System.out.println("This is a Personal Contact");
System.out.println();
for(int j = 0; j < pContacts.size(); j++){
ContactList pList = pContacts.get(j);
pList = pContacts.get(j);
System.out.println(pList.toString());
}
}*/
}
public void endOfProgram(){
System.out.println("Thank you! Have a great day!");
Runtime.getRuntime().exit(0);
}
}
If you're looking to get a value based on ID, try making a method that iterates over the contents of the ArrayList to find one that matches:
public ContactList getContactList(int id) {
for (ContactList list : /*your ContactList List object*/) {
if (list.getiD() == id) {
return list;
}
}
return null;
}
This will return null if none is found, or the first result in the list.