Question

Hi all I have following code that generates error why.If any know please suggest me.

public class Class {
    public static void main(String args[]) {
        public int i = 10;
        i = i++;
        System.out.println("Value of i=" + i);
    }
}

Answer 1

You’re using a visibility modifier, public, for a local variable. This isn’t allowed (and makes no sense) since the scope of a local variable is always confined to within that method.

The following code:

public class Class {
    public static void main(String args[]) {
        int i = 10;
        i = i++;
        System.out.println("Value of i=" + i);
    }
}

…compiles no problem.

Note you could also potentially move the i outside the method to a field, which would also work:

public class Class {

    public int i = 10;

    public static void main(String args[]) {
        i = i++;
        System.out.println("Value of i=" + i);
    }
}

Note that i = i++ may also be causing an issue different to what you’re expecting, but it’s difficult to say without a more thorough explanation. You probably just meant i++ on that line.