bug in program flow?

[pizzapim]

Hello,

I'm new to Java and I have a problem with this code. When my program gets to the following piece of code it ignores the while loop and automatically goes to the next while loop:

while (name[1] == null) {
			System.out.println("Enter your family's name: ");
			name[1] = scanner1.nextLine();
			System.out.println(name[1]);
}

If someone sees the bug please leave a reply.
Here's my class:

import java.util.Scanner;

public class test2 {
	public static void main(String[] args) {
		Scanner scanner1 = new Scanner(System.in);
		int[] age;
		String[] name;
		age = new int[2];
		name = new String[2];
		
		while (name[0] == null) {
			System.out.println("Enter your name: ");
			name[0] = scanner1.nextLine();
		}
		while (age[0] == 0) {
			System.out.println("Enter your age: ");
			age[0] = scanner1.nextInt();
		}
		while (name[1] == null) {
			System.out.println("Enter your family's name: ");
			name[1] = scanner1.nextLine();
			System.out.println(name[1]);
		}
		while (age[1] == 0) {
			System.out.println("How much money yar have?");
			age[1] = scanner1.nextInt();
		}
	}
}

greetings, pizzapim

[DarrylBurke]

Forum Rules -- particularly the third paragraph.
http://www.java-forums.org/forum-gui...w-members.html
BB Code List - Java Programming Forum - Learn Java Programming

db

[jim829]

First,you should read the forum guidelines mentioned in the FAQ. One of the things it says to do is use code tags for formatting code. I have done it for you here.

while (name[1] == null) {
            System.out.println("Enter your family's name: ");
            name[1] = scanner1.nextLine();
            System.out.println(name[1]);
}

If someone sees the bug please leave a reply.
Here's my class:

import java.util.Scanner;
 
public class test2 {
    public static void main(String[] args) {
        Scanner scanner1 = new Scanner(System.in);
        int[] age;
        String[] name;
        age = new int[2];
        name = new String[2];
 
        while (name[0] == null) {
            System.out.println("Enter your name: ");
            name[0] = scanner1.nextLine();
        }
        while (age[0] == 0) {
            System.out.println("Enter your age: ");
            age[0] = scanner1.nextInt();
        }
        while (name[1] == null) {
            System.out.println("Enter your family's name: ");
            name[1] = scanner1.nextLine();
            System.out.println(name[1]);
        }
        while (age[1] == 0) {
            System.out.println("How much money yar have?");
            age[1] = scanner1.nextInt();
        }
    }
}

I believe the problem is that after your scanner1.nextInt() is executed, there is still a trailing line terminator in the buffer which is picked up by the next loop without user intervention.

Regards,
Jim

[pizzapim]

I figured out that I mustn't create the Scanner outside of the while loop, so I created it inside it and now it works.
Thanks to jim829!

Regards, pizzapim

[superhaNds]

I figured out that I mustn't create the Scanner outside of the while loop, so I created it inside it and now it works.
Thanks to jim829!

Regards, pizzapim

You could also just discard the token by using scanner.next();