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  1. class IndirectReference<E> {
  2.     private E ref;
  3.  
  4.     public IndirectReference(E ref) {
  5.         this.ref = ref;
  6.     }
  7.  
  8.     public E get() {
  9.         return ref;
  10.     }
  11.  
  12.     public void set(E ref) {
  13.         this.ref = ref;
  14.     }
  15. }
  16.  
  17. enum Enum { E1, E2 }
  18.  
  19. class Main {
  20.     private IndirectReference<Enum> e;
  21.  
  22.     public Enum get() {
  23.         return e.get();
  24.     }
  25.  
  26.     public void foo(IndirectReference<Enum> ref) {
  27.         this.e = ref;
  28.     }
  29.  
  30.     public static void main(String[] args) {
  31.         Main prog = new Main();
  32.         IndirectReference<Enum> ref = new IndirectReference(Enum.E1);
  33.         prog.foo(ref);
  34.         System.out.println("Before: " + prog.get());
  35.         ref.set(Enum.E2);
  36.         System.out.println("After: " + prog.get());
  37.     }
  38. }
  39.  
Success #stdin #stdout 0.06s 380160KB
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Standard input is empty
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Before: E1
After: E2
https://ideone.com/OZfZB7
language:
Java (HotSpot 12)
created:
12 years ago
visibility:
public

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