pre increment VS post increment in Java

/**
 * @author lautturi.com 
 * Java example: pre increment and post increment in java
 */

import java.util.*;

public class Lautturi {
	public static void main(String[] args) {
		int x =0;
		int y = 0;
		int z = 0;
		
		x = 0;
		// PRE increments: increments before it prints x or stmt  
		System.out.println("Pre x:"+ ++x);
		System.out.println("x: "+ x);
		
		x = 0;
		// POST increments: increments after it prints x or stmt  
		System.out.println("Post x: "+ x++); 
		System.out.println("x"+ x);  
		
		y = 0;
		// PRE increments: increments before it assign to z
		z = ++y;
		System.out.println("y:"+y);
		System.out.println("z:"+z);	
		
		y = 0;
		// POST increments: increments after it assign to z
		z = y++;
		System.out.println("y:"+y);
		System.out.println("z:"+z);	

	}
}

output:

Pre x:1
x: 1
Post x: 0
x1
y:1
z:1
y:1
z:0