JAVA的静态变量和静态方法（STATIC）与实例变量对比代码

 1 class StaticModifier{
 2     static int i = 10;
 3     int j;
 4     StaticModifier() {
 5         j = 20;
 6     }
 7     public static int addUp(int x, int y) {
 8         return x + y;
 9     }
10 }
11 
12 public class StaticModifierTest{
13     public static void main(String args[]) {
14         int a = 9;
15         int b = 10;
16         System.out.println(" var of class i = " + StaticModifier.i);
17         StaticModifier s = new StaticModifier();
18         System.out.println(" var of instant j = " + s.j);
19         int c = StaticModifier.addUp(a, b);
20         System.out.println("addUp() gives: " + c);
21     }
22 }