Why is the result "0", not "1"?

public class Test{
private static int a;
public static void main(String[] args){
modify(a);
System.out.println(a);
public static void modify(int a){
a++;
Any idea?
Thanks in advance!

Variables are passed by value, not by reference in Java.
Hence you are increasing a copy of your static class variale a. It is calles a, too, but has nothing to do with the class varibale. You can access the class variable by the this keyword.

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Why is the result "0", not "1"?

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