So im having trouble getting the first read input to read all inputs on the line. But for some reason it doesnt take into consideration of whitespaces. in fact, it considers the whitespace from the print information as part of the whitespace. only name has this problem. ID does not have this problem. I would just like to know how to fix this one problem since it is giving me the most trouble.
public class Project2 {
public static Scanner sc = new Scanner (System.in);
public static void main(String[] args) {
PersonList PersonList = new PersonList();
System.out.print("Welcome to my personal Management Program\n\n");
System.out.print("\nChoose one of the following options: \n\n");
//print out options for user
for (;;) {
int input = 0;
System.out.print("1- Enter the information of a faculty\n");
System.out.print("2- Enter the information of a student\n");
System.out.print("3- Print tuition person for a student\n");
System.out.print("4- Print faculty information\n");
System.out.print("5- Enter the information of a staff member\n");
System.out.print("6- Print the information of a staff member\n");
System.out.print("7-Exit the program\n\n");
System.out.print("\tEnter a selection: ");
input = sc.nextInt();
if (input == 1) {
faculty f = new faculty();
System.out.print("Enter the faculty info:\n");
System.out.print("\tName of Faculty: ");
f.name = sc.nextLine();
System.out.print("\tID: ");
f.ID = sc.nextLine();
String rank, department;
for(;;) {
System.out.print("\n\tRank: ");
rank = sc.nextLine();
if (rank.equalsIgnoreCase("professor") || rank.equalsIgnoreCase("adjunct")) {
f.rank = rank;
break;
}
else {
System.out.print("\"" + rank +"\" is invalid");
}
}
for(;;) {
System.out.print("\tDepartment: ");
department = sc.nextLine();
if (department.equalsIgnoreCase("mathematics") || department.equalsIgnoreCase("engineering") || department.equalsIgnoreCase("sciences")) {
f.Department = department;
break;
}
else {
System.out.print("\"" + department +"\" is invalid");
}
}
System.out.println("Faculty added!");
PersonList.addPerson(f);
}
When you read the selection input = sc.nextInt() it returns the next integer it finds, stopping right after that. It returns the choice typed but it does not read the newline. If you typed 1 (space one space) it would skip over the leading space then read the 1 and stop; it would not read the following space or the newline.
So when you get to the faculty name f.name = sc.nextLine() it reads whatever was remaining from the input = line, which is probably just a newline, and returns that for the name.
Now when you get to f.ID = sc.nextLine() the input buffer is clear so it reads ID as you expect it to.
A simple solution is to just finish reading the line by adding a nextLine() after reading the selection:
System.out.print("\tEnter a selection: ");
input = sc.nextInt();
sc.nextLine(); // Read the remainder of the line and throw it away
Read the javadoc for java.util.Scanner and for nextInt() and nextInt(radix)
`Scanner scanner = new Scanner(System.in);
System.out.println("Enter your name:");
String userName = scanner.nextLine();
if (scanner.hasNextDouble()){
System.out.println("You can't enter numbers");
}`
Here i can't print "You can't enter numbers". Or is there any other option to restrict user to input numbers?
You can try out something like below
public static void main(String[] args) {
boolean validUsername = false;
String regexForNumbers = ".*\\d.*";
Scanner scanner = new Scanner(System.in);
System.out.println("Enter your name:");
while (!validUsername) {
String userName = scanner.nextLine();
if(userName.matches(regexForNumbers)){
System.out.println("Username Can not contain numbers");
System.out.println("Please Enter username again:");
}else{
validUsername = true;
}
}
}
Here String regexForNumbers = ".*\\d.*"; will check whether the username contains a number,and you can expect something like this,
Enter your name:
maneesha123
Username Can not contain numbers
Please Enter username again:
123
Username Can not contain numbers
Please Enter username again:
maneesha
Keep it simple, use the String#matches() method with a small Regular Expression (regex) to make sure numerical digits have not been supplied. The "\\D" regex does exactly that, for example:
Scanner scanner = new Scanner(System.in);
String userName = "";
while (userName.isEmpty()) {
System.out.println();
System.out.print("Enter your User name: --> ");
userName = scanner.nextLine();
// Anything is acceptable 'except' numerical digits.
if (!userName.matches("\\D+")) {
System.err.println("Invalid name supplied (" + userName + ")!.\n"
+ "Numerical digits are not permitted! Try again...");
userName = "";
}
}
System.out.println("Acceptable: " + userName);
How could I read input from the console using the Scanner class? Something like this:
System.out.println("Enter your username: ");
Scanner = input(); // Or something like this, I don't know the code
Basically, all I want is have the scanner read an input for the username, and assign the input to a String variable.
A simple example to illustrate how java.util.Scanner works would be reading a single integer from System.in. It's really quite simple.
Scanner sc = new Scanner(System.in);
int i = sc.nextInt();
To retrieve a username I would probably use sc.nextLine().
System.out.println("Enter your username: ");
Scanner scanner = new Scanner(System.in);
String username = scanner.nextLine();
System.out.println("Your username is " + username);
You could also use next(String pattern) if you want more control over the input, or just validate the username variable.
You'll find more information on their implementation in the API Documentation for java.util.Scanner
Scanner scan = new Scanner(System.in);
String myLine = scan.nextLine();
Reading Data From The Console
BufferedReader is synchronized, so read operations on a BufferedReader can be safely done from multiple threads. The buffer size may be specified, or the default size(8192) may be used. The default is large enough for most purposes.
readLine() « just reads data line by line from the stream or source. A line is considered to be terminated by any one these: \n, \r (or) \r\n
Scanner breaks its input into tokens using a delimiter pattern, which by default matches whitespace(\s) and it is recognised by Character.isWhitespace.
« Until the user enters data, the scanning operation may block, waiting for input.
« Use Scanner(BUFFER_SIZE = 1024) if you want to parse a specific type of token from a stream.
« A scanner however is not thread safe. It has to be externally synchronized.
next() « Finds and returns the next complete token from this scanner.
nextInt() « Scans the next token of the input as an int.
Code
String name = null;
int number;
java.io.BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
name = in.readLine(); // If the user has not entered anything, assume the default value.
number = Integer.parseInt(in.readLine()); // It reads only String,and we need to parse it.
System.out.println("Name " + name + "\t number " + number);
java.util.Scanner sc = new Scanner(System.in).useDelimiter("\\s");
name = sc.next(); // It will not leave until the user enters data.
number = sc.nextInt(); // We can read specific data.
System.out.println("Name " + name + "\t number " + number);
// The Console class is not working in the IDE as expected.
java.io.Console cnsl = System.console();
if (cnsl != null) {
// Read a line from the user input. The cursor blinks after the specified input.
name = cnsl.readLine("Name: ");
System.out.println("Name entered: " + name);
}
Inputs and outputs of Stream
Reader Input: Output:
Yash 777 Line1 = Yash 777
7 Line1 = 7
Scanner Input: Output:
Yash 777 token1 = Yash
token2 = 777
There is problem with the input.nextInt() method - it only reads the int value.
So when reading the next line using input.nextLine() you receive "\n", i.e. the Enter key. So to skip this you have to add the input.nextLine().
Try it like that:
System.out.print("Insert a number: ");
int number = input.nextInt();
input.nextLine(); // This line you have to add (it consumes the \n character)
System.out.print("Text1: ");
String text1 = input.nextLine();
System.out.print("Text2: ");
String text2 = input.nextLine();
There are several ways to get input from the user. Here in this program we will take the Scanner class to achieve the task. This Scanner class comes under java.util, hence the first line of the program is import java.util.Scanner; which allows the user to read values of various types in Java. The import statement line should have to be in the first line the java program, and we proceed further for code.
in.nextInt(); // It just reads the numbers
in.nextLine(); // It get the String which user enters
To access methods in the Scanner class create a new scanner object as "in". Now we use one of its method, that is "next". The "next" method gets the string of text that a user enters on the keyboard.
Here I'm using in.nextLine(); to get the String which the user enters.
import java.util.Scanner;
class GetInputFromUser {
public static void main(String args[]) {
int a;
float b;
String s;
Scanner in = new Scanner(System.in);
System.out.println("Enter a string");
s = in.nextLine();
System.out.println("You entered string " + s);
System.out.println("Enter an integer");
a = in.nextInt();
System.out.println("You entered integer " + a);
System.out.println("Enter a float");
b = in.nextFloat();
System.out.println("You entered float " + b);
}
}
import java.util.Scanner;
public class ScannerDemo {
public static void main(String[] arguments){
Scanner input = new Scanner(System.in);
String username;
double age;
String gender;
String marital_status;
int telephone_number;
// Allows a person to enter his/her name
Scanner one = new Scanner(System.in);
System.out.println("Enter Name:" );
username = one.next();
System.out.println("Name accepted " + username);
// Allows a person to enter his/her age
Scanner two = new Scanner(System.in);
System.out.println("Enter Age:" );
age = two.nextDouble();
System.out.println("Age accepted " + age);
// Allows a person to enter his/her gender
Scanner three = new Scanner(System.in);
System.out.println("Enter Gender:" );
gender = three.next();
System.out.println("Gender accepted " + gender);
// Allows a person to enter his/her marital status
Scanner four = new Scanner(System.in);
System.out.println("Enter Marital status:" );
marital_status = four.next();
System.out.println("Marital status accepted " + marital_status);
// Allows a person to enter his/her telephone number
Scanner five = new Scanner(System.in);
System.out.println("Enter Telephone number:" );
telephone_number = five.nextInt();
System.out.println("Telephone number accepted " + telephone_number);
}
}
You can make a simple program to ask for the user's name and print whatever the reply use inputs.
Or ask the user to enter two numbers and you can add, multiply, subtract, or divide those numbers and print the answers for user inputs just like the behavior of a calculator.
So there you need the Scanner class. You have to import java.util.Scanner;, and in the code you need to use:
Scanner input = new Scanner(System.in);
input is a variable name.
Scanner input = new Scanner(System.in);
System.out.println("Please enter your name: ");
s = input.next(); // Getting a String value
System.out.println("Please enter your age: ");
i = input.nextInt(); // Getting an integer
System.out.println("Please enter your salary: ");
d = input.nextDouble(); // Getting a double
See how this differs: input.next();, i = input.nextInt();, d = input.nextDouble();
According to a String, int and a double varies the same way for the rest. Don't forget the import statement at the top of your code.
A simple example:
import java.util.Scanner;
public class Example
{
public static void main(String[] args)
{
int number1, number2, sum;
Scanner input = new Scanner(System.in);
System.out.println("Enter First multiple");
number1 = input.nextInt();
System.out.println("Enter second multiple");
number2 = input.nextInt();
sum = number1 * number2;
System.out.printf("The product of both number is %d", sum);
}
}
When the user enters his/her username, check for valid entry also.
java.util.Scanner input = new java.util.Scanner(System.in);
String userName;
final int validLength = 6; // This is the valid length of an user name
System.out.print("Please enter the username: ");
userName = input.nextLine();
while(userName.length() < validLength) {
// If the user enters less than validLength characters
// ask for entering again
System.out.println(
"\nUsername needs to be " + validLength + " character long");
System.out.print("\nPlease enter the username again: ");
userName = input.nextLine();
}
System.out.println("Username is: " + userName);
To read input:
Scanner scanner = new Scanner(System.in);
String input = scanner.nextLine();
To read input when you call a method with some arguments/parameters:
if (args.length != 2) {
System.err.println("Utilizare: java Grep <fisier> <cuvant>");
System.exit(1);
}
try {
grep(args[0], args[1]);
} catch (IOException e) {
System.out.println(e.getMessage());
}
import java.util.*;
class Ss
{
int id, salary;
String name;
void Ss(int id, int salary, String name)
{
this.id = id;
this.salary = salary;
this.name = name;
}
void display()
{
System.out.println("The id of employee:" + id);
System.out.println("The name of employye:" + name);
System.out.println("The salary of employee:" + salary);
}
}
class employee
{
public static void main(String args[])
{
Scanner sc = new Scanner(System.in);
Ss s = new Ss(sc.nextInt(), sc.nextInt(), sc.nextLine());
s.display();
}
}
Here is the complete class which performs the required operation:
import java.util.Scanner;
public class App {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
final int valid = 6;
Scanner one = new Scanner(System.in);
System.out.println("Enter your username: ");
String s = one.nextLine();
if (s.length() < valid) {
System.out.println("Enter a valid username");
System.out.println(
"User name must contain " + valid + " characters");
System.out.println("Enter again: ");
s = one.nextLine();
}
System.out.println("Username accepted: " + s);
Scanner two = new Scanner(System.in);
System.out.println("Enter your age: ");
int a = two.nextInt();
System.out.println("Age accepted: " + a);
Scanner three = new Scanner(System.in);
System.out.println("Enter your sex: ");
String sex = three.nextLine();
System.out.println("Sex accepted: " + sex);
}
}
There is a simple way to read from the console.
Please find the below code:
import java.util.Scanner;
public class ScannerDemo {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
// Reading of Integer
int number = sc.nextInt();
// Reading of String
String str = sc.next();
}
}
For a detailed understanding, please refer to the below documents.
Doc
Now let's talk about the detailed understanding of the Scanner class working:
public Scanner(InputStream source) {
this(new InputStreamReader(source), WHITESPACE_PATTERN);
}
This is the constructor for creating the Scanner instance.
Here we are passing the InputStream reference which is nothing but a System.In. Here it opens the InputStream Pipe for console input.
public InputStreamReader(InputStream in) {
super(in);
try {
sd = StreamDecoder.forInputStreamReader(in, this, (String)null); // ## Check lock object
}
catch (UnsupportedEncodingException e) {
// The default encoding should always be available
throw new Error(e);
}
}
By passing the System.in this code will opens the socket for reading from console.
You can flow this code:
Scanner obj= new Scanner(System.in);
String s = obj.nextLine();
You can use the Scanner class in Java
Scanner scan = new Scanner(System.in);
String s = scan.nextLine();
System.out.println("String: " + s);
import java.util.Scanner; // Import the Scanner class
class Main { // Main is the class name
public static void main(String[] args) {
Scanner myObj = new Scanner(System.in); // Create a Scanner object
System.out.println("Enter username");
String userName = myObj.nextLine(); // Read user input
System.out.println("Username is: " + userName); // Output user input
}
}
you have wrote
Scanner = input()
this is wrong method, you have to make an integer or a string, i would like to prefer string, and then give a string any name that can be i that can be n or anything else, remember that you are giving name to username you can also give name username also, and the code is
String username = sc.nextline();
System.our.println("the username is" + username);
I hope you understand now
I just want the scanner to read new line as empty string then continue to next process if the user press enter. So valid input must be y,n,enter. Any idea how to do this?
This is my code:
String gender = "", employed = "";
Scanner in = new Scanner(System.in);
System.out.print("Gender M/F, press enter to skip... ");
while(!in.hasNext("[mfMF]$")){
System.out.print("Invalid, please choose m/f only... ");
in.nextLine();
}
if(in.hasNextLine()){
gender = in.nextLine();
}
System.out.print("Employed? y/n, press enter to skip... ");
while(!in.hasNext("[ynYN]$|")){
System.out.print("Invalid, please choose y/n only... ");
in.nextLine();
}
if(in.hasNextLine()){
employed = in.nextLine();
}
System.out.println(gender + " : " + employed);
Try This :
import java.util.*;
class Scanner1
{
public static void main(String args[])
{
Scanner sc=new Scanner(System.in);
String s;
do
{
s=sc.nextLine();
if(!(s.equalsIgnoreCase("y")||s.equalsIgnoreCase("n")||s.equalsIgnoreCase("")))
{
System.out.println("Please Enter valid input");
}
}while(!(s.equalsIgnoreCase("y")||s.equalsIgnoreCase("n")||s.equalsIgnoreCase("")));
}
}
So, to check if the user has pressed enter, you would have to make use of the isEmpty() method. The way to do that is shown below:
String enter = in.nextLine();
if (enter.isEmpty()) {
// do what is needed
}
I am working on improving my do-while loop skills and i am kind of stuck trying to implement a do-while loop which loops everytime the word bye is not found.
public static void getinput() throws IOException {
Scanner scanner = new Scanner(System.in);
String input = null;
/* End Initialization */
System.out.println("Welcome ");
System.out.println("What would you like to know?");
do{
System.out.print("> ");
input = scanner.nextLine().toLowerCase();
parseFile(input);
System.out.println("is there anything you want to know?");
}
while(input.contains("bye")
{
System.out.println("have a good day");
}
can someone assist me with my problem?
The syntax looks like this:
do{
System.out.print("> ");
input = scanner.nextLine().toLowerCase();
parseFile(input);
System.out.println("is there anything you want to know?");
} while(input.contains("bye"); // Semicolon after the "while." This is the end of the statement
// No brackets here.
System.out.println("have a good day");
However, note that this will continue to loop as long as the user is saying "bye" (perhaps you want while (!input.contains("bye")))
The line
while(input.contains("bye")
is missing a semicolon and should be testing the opposite case, and the code after that line does not need to be enclosed in brackets. Otherwise your code looks fine.
I beieve you are looking for something like,
Scanner scanner = new Scanner(System.in);
String input = "";
System.out.println("Welcome ");
System.out.println("What would you like to know?");
do {
System.out.print("> ");
input = scanner.nextLine().toLowerCase();
parseFile(input);
System.out.println("is there anything you want to know?");
} while (!input.startsWith("bye")); // <-- while it doesn't...
System.out.println("have a good day");
do while syntax
do {
statement(s)
} while (expression);
Your Code
public static void getinput() throws IOException {
Scanner scanner = new Scanner(System.in);
String input = null;
/* End Initialization */
System.out.println("Welcome ");
System.out.println("What would you like to know?");
do{
System.out.print("> ");
input = scanner.nextLine().toLowerCase();
parseFile(input);
System.out.println("is there anything you want to know?");
}
while(input.contains("bye"));//right parenthesis add semicolon
OR
while(input.equalsIgnoreCase("bye"));
//remove braces from here.
System.out.println("have a good day");