Java: Not a statement

Question

I suppose this is more a question about language theory than anything else. Why is the first statement in main legal, when the second is not? Don\'t they evaluate to be the

Answer 1

In the first statement you are actually calling a function and second statement doesn't give any value. Incase you want to process the return value, you need to call a variable for return type

Eg:

public class Main {

    public static void main(String[] args) {
        int n = foo();
    
         //do whatever you want with return 
    }

    public static int foo() {
        return 0;
    }
}