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  1. class Main {
  2.     private static Main sigleton=new Main();
  3.  
  4.     static {
  5.       System.out.println("static 1: " + sigleton + " " + sigleton.count1 + " " + sigleton.count2);
  6.     }
  7.  
  8.     private static int count1;
  9.  
  10.     static {
  11.       System.out.println("static 2: " + sigleton + " " + sigleton.count1 + " " + sigleton.count2);
  12.     }
  13.  
  14.     private static int count2=0;
  15.  
  16.     static {
  17.       System.out.println("static 3: " + sigleton + " " + count1 + " " + count2);
  18.     }
  19.  
  20.     {
  21.       System.out.println("non-static: " + sigleton + " " + count1 + " " + count2);
  22.     }
  23.  
  24.     private Main (){
  25.         count1++;
  26.         count2++;
  27.  
  28.         System.out.println(count1 + " " + count2);
  29.     }
  30.  
  31.     public static Main getInstance(){
  32.         return sigleton;
  33.     }
  34.  
  35.     public static void main(String[] args) {
  36.         Main f= Main.getInstance(); // case 1
  37.         System.out.println(f.count1);
  38.         System.out.println(f.count2);
  39.         Main t= new Main(); // case 2
  40.         System.out.println(t.count1);
  41.         System.out.println(t.count2);
  42.     } 
  43. }
Success #stdin #stdout 0.02s 245632KB
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Standard input is empty
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non-static: null 0 0
1 1
static 1: Main@19821f 1 1
static 2: Main@19821f 1 1
static 3: Main@19821f 1 0
1
0
non-static: Main@19821f 1 0
2 1
2
1
https://ideone.com/OFHF8
language:
Java (HotSpot 12)
created:
11 years ago
visibility:
public

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