Java中static的作用

package com.birdme;
public class UseStatic {
/**
* @param args
*/
private static int s;    
public UseStatic(){
System.out.println("Create new Class");
}
static {
System.out.println("static block initialized");
}    
public int getStatic(){
return s;
}
public void  setStatic(int i){
s=i;
}

public static void main(String[] args) {
// TODO Auto-generated method stub
UseStatic classA= new UseStatic();
UseStatic classB= new UseStatic();
System.out.println("classA.s="+classA.getStatic()+";classB.s=
"+classB.getStatic());
classA.setStatic(10);
System.out.println("classA.s="+classA.getStatic()+";classB.s=
"+classB.getStatic());
classB.setStatic(classB.getStatic()+10);
System.out.println("classA.s="+classA.getStatic()+";classB.s=
"+classB.getStatic());
}
}

static block initialized
Create new Class
Create new Class
classA.s=0;classB.s=0
classA.s=10;classB.s=10
classA.s=20;classB.s=20