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In Java, how do you create an ArrayList, with one element of that list being another ArrayList, that is unique for each element?

So for example.
I have an ArrayList of people. Created through a people object that contains a name, address, age, etc.
How would I then add another list to that, allowing a unique list of hobbies for each person?
So I could have:
James, 32, England, (Football, Tennis)
Chloe, 21, Wales, (Art)
Tried a few things and struggling with it.
import java.util.ArrayList;
public class People {
int id;
String name;
ArrayList<String> hobbies;
public People(int id, String name, ArrayList<String> hobbies) {
this.id = id;
this.name = name;
this.hobbies = hobbies;
}
public People(String name) {
this.name = name;
}
public People() {
// TODO Auto-generated constructor stub
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
#Override
public String toString() {
return "People [id=" + id + ", name=" + name + ", hobbies=" + hobbies + "]";
}
}
import java.util.ArrayList;
public class Runner {
public static void main(String[] args) {
// TODO Auto-generated method stub
ArrayList<People> arrayPeople = new ArrayList<>();
ArrayList<String> hobbies = new ArrayList<>();
hobbies.add("Football");
hobbies.add("Tennis");
arrayPeople.add(new People(1,"Paul", hobbies));
hobbies.add("Golf");
arrayPeople.add(new People(2,"James", hobbies));
System.out.println(arrayPeople);
}
}
This creates a hobby list that is the same for each person, not unique.

This creates a hobby list that is the same for each person, not unique.
That's because member hobbies in [Paul] People object has same value as member hobbies in [James] People object, since they are assigned the same value in method main of class Runner. Hence when you change hobbies variable, in method main of class Runner, you are changing for both Paul and James.
The simplest solution is to change the class constructor so that it creates a copy of the hobbies parameter and assigns the copy to the hobbies member:
public People(int id, String name, List<String> hobbies) {
this.id = id;
this.name = name;
this.hobbies = new ArrayList<>(hobbies);
}
However, I suggest that you add methods to class People to manipulate hobbies member, including:
addHobby for adding a hobby
removeHobby for removing a hobby
clearHobbies for removing all hobbies
getHobbies that returns a copy of hobbies (so that code that calls the method cannot change hobbies)
Below code demonstrates.
Note that you should always use the interface – in this case java.util.List – rather than the implementation – in this case ArrayList – in the API so that you can change class People without having to change its API. If you change the API of class People then all other classes that use class People – like class Runner in the code in your question – will need to be changed as well.
import java.util.ArrayList;
import java.util.List;
public class People {
private int id;
private String name;
private List<String> hobbies;
public People(int id, String name, List<String> hobbies) {
this.id = id;
this.name = name;
this.hobbies = new ArrayList<>(hobbies);
}
public People(int id, String name) {
this(id, name, new ArrayList<String>());
}
public People() {
this(0, "");
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public void addHobby(String hobby) {
if (!hobbies.contains(hobby)) {
hobbies.add(hobby);
}
}
public void clearHobbies() {
hobbies.clear();
}
public List<String> getHobbies() {
return List.of(hobbies.toArray(new String[]{}));
}
public void removeHobby(String hobby) {
if (hobbies.contains(hobby)) {
hobbies.remove(hobby);
}
}
#Override
public String toString() {
return "People [id=" + id + ", name=" + name + ", hobbies=" + hobbies + "]";
}
public static void main(String[] args) {
List<People> arrayPeople = new ArrayList<>();
People paul = new People(1,"Paul");
paul.addHobby("Football");
paul.addHobby("Tennis");
People james = new People(2,"James");
james.addHobby("Football");
james.addHobby("Tennis");
james.addHobby("Golf");
arrayPeople.add(paul);
arrayPeople.add(james);
System.out.println(arrayPeople);
}
}
Running the above code prints the following:
[People [id=1, name=Paul, hobbies=[Football, Tennis]], People [id=2, name=James, hobbies=[Football, Tennis, Golf]]]

The question seemed unclear to me, however I assume that you created lists such as
[name,age,location]
However, this is not an object. If you create a person object, you can add features inside it. So that when you create a person object, then you will have access to add/edit new features. In your case, your features must be:
Name
Age
Location
List (Whatever you name it, type of it must be an arraylist).

To have a list of people:
class Person{
String name;
int age;
String Address;
...
}
and
ArrayList<Person>
For the people class, if you need each hobby in hobbies to be unique you can have a Set class to store hobbies.
class Person{
String name;
int age;
String address;
Set<String> hobbies;
...
}
If the order does not matter you can use HashSet To maintain the order you can use TreeSet or LinkedHashSet.
class person{
String name;
int age;
String address;
TreeSet<String> hobbies;
...
}
class Person{
String name;
int age;
String address;
LinkedHashSet<String> hobbies;
...
}
To add a hobby to a person.
String hobby = "a hobby";
person.add(hobby);
To add hobbies to a person;
String hobby1 = "hobby1";
String hobby1 = "hobby2";
...
Set<String> hobbies = new TreeSet(); // or Set<String> hobbies = new LinkedHashMap();
hobbies.add(hobby1);
hobbies.add(hobby2);
...
person.addAll(hobby);
For another person with the same hobbies, you need to copy the hobbies, then modifying the hobbies of the second person will not affect the hobbies of the first person.
Set<String> new_hobbies = new TreeSet(old_hobbies); // or new LinkedHashSet(old_hobbies);
another_person.addAll(new_hobbies);

I have to store employee data in a ConcurrentHashMap containing name and id as key and other details as value

Here I have used two ConcurrentHashMaps,
1st map: key = name
value = Employee obj (containing 2nd map)
2nd map: key = id
value = Employee details( pojo class)
But I m doing it wrong. pls someone explain what should be my approach.
here is my code -
import java.util.concurrent.ConcurrentHashMap;
public class POJODemo {
public static void main(String[] args)
{
ConcurrentHashMap <String, Employee> outer_concurrentHashMap = new ConcurrentHashMap<String,Employee>();
Employee empobj = new Employee();
empobj.setId("123");
outer_concurrentHashMap.put("disha", empobj.toString());
System.out.println(outer_concurrentHashMap);
}
}
class Employee
{
public static ConcurrentHashMap <String , POJODetails> inner_concurrentHashMap = new ConcurrentHashMap <String , POJODetails>();
private String id;
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
POJODetails details = new POJODetails("korba", 12345);
}
class POJODetails{
public POJODetails(String address, int phone) {
super();
this.address = address;
this.phone = phone;
}
private String address;
private int phone;
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
public int getPhone() {
return phone;
}
public void setPhone(int phone) {
this.phone = phone;
}
public String toString()
{
return ;
}
}

'outer_concurrentHashMap.put("disha", empobj.toString());' is incorrect; should be 'outer_concurrentHashMap.put("disha", empobj);'
You cannot convert your object to a string and put it in a hash map that only takes employee as a value. When you print the Map it will call.toString on the employee and still print it visibly for you.

When you created your HashMap, you specified that it would take an object of type String as a 'key' and an object of type Employee as a 'value'.
Using HashMap.get('key'), will return an object of type Employee, which is the mapped value to your key. So you could write:
Employee retrievedEmployee = outer_concurrentHashMap.get("disha");
//'retrievedEmployee' has the same value as 'empobj'
In your code, when you write:
outer_concurrentHashMap.put("disha", empobj.toString());
you are not adding an object of type Employee to your hashmap, but the representation of that object as a string.
The correct code would be:
outer_concurrentHashMap.put("disha", empobj);

OpenCSV memberFieldsToBindTo not working - Java

I am trying to use OpenCSV to parse a CSV file into a list of objects so I can load student data into my Student Team Allocator system.
I have been following this guide under the heading 'Parsing the records into a Java Object'
After some issues with dependencies I have it outputting a list of Student objects, however the CSV columns are not bound to the member fields as they should be. Print test returns null values for every object's fields.
I have two constructors in Student, one that initialises the 3 fields, and one that is empty. I know currently the empty one gets used as removing this one causes InstantiationExceptions in the Student object.
CSVParser Class
public class CSVParser {
private static String CSV_FILE_PATH;
public CSVParser(String CSVPath){
CSV_FILE_PATH = CSVPath;
try (
Reader reader = Files.newBufferedReader(Paths.get(CSV_FILE_PATH));
) {
ColumnPositionMappingStrategy strategy = new ColumnPositionMappingStrategy();
strategy.setType(Student.class);
String[] memberFieldsToBindTo = {"fName", "sName", "stuNumber"};
strategy.setColumnMapping(memberFieldsToBindTo);
CsvToBean csvToBean = new CsvToBeanBuilder(reader)
.withMappingStrategy(strategy)
.withSkipLines(1)
.withIgnoreLeadingWhiteSpace(true)
.build();
List<Student> Students = csvToBean.parse();
for (Student s : Students) {
System.out.println("First Name : " + s.getFirstName());
System.out.println("Second Name : " + s.getSecondName());
System.out.println("StudentNo : " + s.getStudentNumber());
System.out.println("---------------------------");
}
} catch (IOException ex) {
Logger.getLogger(CSVParser.class.getName()).log(Level.SEVERE, null, ex);
}
}
}
Student Class
public class Student {
private String fName;
private String sName;
private String stuNumber;
private String skill;
private final String[] skills = {"Planning","Writing","Developing"};
public Student(){
}
public Student(String fName, String sName, String stuNumber) {
this.fName = fName;
this.sName = sName;
this.stuNumber = stuNumber;
}
// Setters
public void setSkill(int skillIndex){
this.skill = skills[skillIndex];
}
public void setFirstName(String fName){
this.fName = fName;
}
public void setSecondName(String sName){
this.sName = sName;
}
public void setStudentNumber(String stuNumber){
this.stuNumber = stuNumber;
}
// Getters
public String getFirstName(){
return fName;
}
public String getSecondName(){
return sName;
}
public String getStudentNumber(){
return stuNumber;
}
// Save to Database
private void saveStudent(){
// DBConnect db = new DBConnect();
}
}
The exception caused by non empty constructor
The print test showing null values in Student fields
Please let me know how I can make things any clearer,
Thanks.

The names in the column mapping array should respond to the names of the setters rather than the fields themselves. If it can't find a setter that correspond to the name, it can't set the value.

I want to get individual element of an arrayList in Java

I am newbie in java and I have a method that accepts 3 parameters, query the db and returns result in an arraylist form (like this [1, Java, 3, Bangalore, 10] ). How can i extract individual element so that I can assign each to a var like int id=1;String name=Java.
Below is the method that
ArrayList searchResult =jSearch.doJobSearch(techName, exp, city);
Iterator searchResultIterator = searchResult.iterator();
PrintWriter out = response.getWriter();
String arrayList[] = new String[searchResult.size()];
if(searchResultIterator.hasNext()){
for(int i =0; i<searchResult.size(); i++){
//searchResult.get(i)
out.println(searchResult.get(i));
}
}else{
out.println("No Job found in selected city");
}

ArrayList works in the sense of [index, element].
By using the get method, you're using index as the parameter and it returns the element at that position. So if you're accessing the element by it's index you already have both the id and element, but a different collection interface might suit you better like a map.
http://docs.oracle.com/javase/7/docs/api/java/util/Map.html

Create POJO (Plain Old Java Object). I am providing example how to array list is used when store Real time Object.
package com.appkart.examples;
public class Employee {
private int id;
private String name;
public Employee(int id, String name) {
this.id = id;
this.name = name;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
And Add Employee into Array list and get values
package com.appkart.examples;
import java.util.ArrayList;
public class Program {
public static void main(String[] args) {
ArrayList<Employee> employees = new ArrayList<Employee>();
Employee arun = new Employee(10, "Arun");
Employee ankit = new Employee(20, "Ankit");
Employee jon = new Employee(30, "Jon");
Employee anil = new Employee(40, "Anil");
employees.add(arun);
employees.add(ankit);
employees.add(jon);
employees.add(anil);
for (Employee employee : employees) {
int id = employee.getId();
String name = employee.getName();
System.out.println("id : "+id +" name : "+name);
}
}
}

Setting Variable in Class that Extends other class

the psuedo for what im trying to do is
-send Array of EMPLOYEE objects to Restaurant Class
-In Class RESTAURANT give each of the employee objects a name and last name (last name not in employee Class but in PERSON Class which Employee CLass Extends.
-print say employeeList[1].getLastName()
hopefully my code explains better
class Person {
public Person(final String last) {
}
}
class Employee extends Person {
private String firstName;
// getFirstName method
// getLastName Method
Employee(final String first, final String last) {
super(last);
}
}
class Restaurant { // set first object in array have first and last name
public void setFirstLast(final Employee[] employeeList) {
String firstName = "Jovana";
String lastName = "Valdez";
employeeList[0] = new Employee(firstName, lastName); // set up via constructor
}
}
public class Main {
private String lastName;
public static void main(final String[] args) {
Employee[] employeeList = new Employee[1]; // my array of Employee objects, all set to null
Restaurant restaurant = new Restaurant();
restaurant.setFirstLast(employeeList);
}
}
from main when i try to print System.out.printf("first is %d\n",arrayList.getFirst()); i get null for the value as well as the value for the last name so what is the correct way to go about and set values to objects in the array?
Edit arrayList initialized in Class restaurant by
public Table[] create_table_array(Table table,int number) {
Table[] TableList = new Table[number];
int i = 0;
for(i = 0; i < number; i++) {
TableList[i] = table;
}
return TableList;

Your constructor doesn't save firstName, it should look like:
Employee(String first, String last) {
super(last);
firstName = first;
}

You did not make good constructor of Person class and it class does not have instance variable lastName in which you should assign value you get in constructor as a parameter.
Also constructor of Employee does not assign any value to firstName.
What ArrayList ?As i see you are working with arrays?I didn't see it in code anywhere?
System.out.printf("first is %d\n",**arrayList**.getFirst());so command is wrong.
Any code that has meaning to me and can be compilled is to fix those things and delete formatting options you putted in System.out.printf because you are not formatting numbers.
So code look like :
class Person {
String lastName;
public Person(final String last) {
lastName=last;
}
}
class Employee extends Person {
private String firstName;
public String getFirstName()
{return firstName;}
public String getLastName()
{return lastName;}
Employee(final String first, final String last) {
super(last);
firstName=first;
}
}
class Restaurant { // set first object in array have first and last name
public void setFirstLast(final Employee[] employeeList) {
String firstName = "Jovana";
String lastName = "Valdez";
employeeList[0] = new Employee(firstName, lastName); // set up via constructor
}
}
public class Main {
private String lastName;
public static void main(final String[] args) {
Employee[] employeeList = new Employee[1];
Restaurant restaurant = new Restaurant();
restaurant.setFirstLast(employeeList);
System.out.printf("first is "+employeeList[0].getFirstName()+" "+employeeList[0].getLastName());
}
}