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  1. class Go extends Exception {
  2.     final int line;
  3.  
  4.     Go(int line) { this.line = line; }
  5.  
  6.     static void to(int line) throws Go { throw new Go(line); }
  7. }
  8.  
  9. abstract class GoToProc {
  10.     int line = 0;
  11.  
  12.     final void run() {
  13.         while (true) {
  14.             try {
  15.                 proc(line);
  16.                 return;
  17.             } catch (Go goTo) {
  18.                 this.line = goTo.line;
  19.             }
  20.         }
  21.     }
  22.  
  23.     abstract void proc(int line) throws Go;
  24. }
  25.  
  26. public class Main {
  27.     public static void main(String[] args) {
  28.         GoToProc factorial = new GoToProc() {
  29.             int f = 1;
  30.             int x = 10;
  31.  
  32.             @Override
  33.             void proc(int line) throws Go {
  34.                 switch (line) {
  35.                     case 0: if (x == 0) Go.to(4);
  36.                     case 1: f = f * x;
  37.                     case 2: x = x - 1;
  38.                     case 3: Go.to(0);
  39.                     case 4: System.out.println(f);
  40.                 }
  41.             }
  42.         };
  43.         factorial.run();
  44.     }
  45. }
Success #stdin #stdout 0.1s 320320KB
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https://ideone.com/Q0HntI
language:
Java (HotSpot 12)
created:
9 years ago
visibility:
public

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