Second Time can not get input from user for String input

Question

Below is the code :

import java.util.Scanner;
public class Calculate{
  public static void main(String args[])
  {
    int age=0;
    String name="";
    Scanner scan=new Scanner(System.in);

    System.out.println("Please Enter value of your age : ");
    age=scan.nextInt();

    System.out.println("Please Enter value of your name : ");
    name=scan.nextLine();

    System.out.println("Age : "+age+", Name : "+name);
  }
}

Now, Here the issue is taking String value from the user.

I can take two INTEGER values from user one by one after pressing [ENTER]. But, In case of taking STRING value from the user Second time, It just let me out after I enter value for Age variable.

If I first take the input for String and then INTERGER than it working fine as below : (First name and then age) :

    System.out.println("Please Enter value of your name : ");
    name=scan.nextLine();

    System.out.println("Please Enter value of your age : ");
    age=scan.nextInt();

What might be the issue ?

how are you providing the input? – Lalit Mehra Jul 25 '19 at 05:46 — Lalit Mehra, Jul 25 '19 at 05:46

score 1 · Answer 1 · answered Jul 25 '19 at 05:47

1

The problem occurs as you hit the enter key, which is a newline \n character.

to add an additional scan.nextLine() after you read the int

System.out.println("Please Enter value of your age : ");
age=scan.nextInt();
scan.nextLine();// additional  line

answered Jul 25 '19 at 05:47

Istiaque Hossain

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So, Why it's working in case of Integer (If I take second integer value from user) ? – Jaimin Modi Jul 25 '19 at 05:53
Integer dose not take `\n` – Istiaque Hossain Jul 25 '19 at 05:57

GOVIND DIXIT · Accepted Answer · 2019-07-25T05:58:31.417

The problem is with the scan.nextInt() method. It only reads the int value. So when you continue reading with scan.nextLine() you receive the "\n" Enter key. So to skip this you have to add the input.nextLine()

Try this:

import java.util.Scanner;
public class Main{
  public static void main(String args[])
  {
    int age=0;
    String name="";
    Scanner scan=new Scanner(System.in);

    System.out.println("Please Enter value of your age : ");
    age=scan.nextInt();

    scan.nextLine(); // This line you have to add (It consumes the \n character)


    System.out.println("Please Enter value of your name : ");
    name=scan.nextLine();

    System.out.println("Age : "+age+", Name : "+name);
  }
}

Output

Please Enter value of your age :
20
Please Enter value of your name :
ABC
Age : 20, Name : ABC

Second Time can not get input from user for String input

2 Answers2