1 public class MyTest5 {
 2 
 3     public static void main(String[] args) {
 4         Singleton singleton = Singleton.getInstance();
 5 
 6         System.out.println("counter1: "+Singleton.counter1);
 7         System.out.println("counter2: "+Singleton.counter2);
 8     }
 9 }
10 
11 class Singleton {
12     public static int counter1;
13 
14     public static int counter2 = 0;
15 
16     private static Singleton singleton = new Singleton();
17 
18     private Singleton(){
19         counter1++;
20         counter2++;
21     }
22 
23     public static Singleton getInstance(){
24         return singleton;
25     }
26 }
27 
28 /*
29 * 输出：
30 * counter1: 1
31 * counter2: 1
32 * */

 1 public class MyTest5 {
 2 
 3     public static void main(String[] args) {
 4         Singleton singleton = Singleton.getInstance();
 5 
 6         System.out.println("counter1: "+Singleton.counter1);
 7         System.out.println("counter2: "+Singleton.counter2);
 8     }
 9 }
10 
11 class Singleton {
12     public static int counter1;
13 
14     private static Singleton singleton = new Singleton();
15 
16     private Singleton(){
17         counter1++;
18         counter2++;
19     }
20 
21     public static int counter2 = 0;
22 
23     public static Singleton getInstance(){
24         return singleton;
25     }
26 }
27 
28 /*
29 * 输出：
30 * counter1: 1
31 * counter2: 0
32 * */