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  1. interface Analyzer {
  2.     int computeValue();
  3.     String performAnalysis();
  4. }
  5.  
  6.  
  7. class AnalyzerImpl implements Analyzer {
  8.  
  9.     @Override
  10.     public int computeValue() {
  11.         return 5;
  12.     }
  13.  
  14.     @Override
  15.     public String performAnalysis() {
  16.         return "Result: " + computeValue();
  17.     }
  18. }
  19.  
  20.  
  21. class AnalyzerDecorator implements Analyzer {
  22.     Analyzer delegate;
  23.     public AnalyzerDecorator(Analyzer delegate) {
  24.         this.delegate = delegate;
  25.     }
  26.  
  27.     @Override
  28.     public int computeValue() {
  29.         return delegate.computeValue();
  30.     }
  31.  
  32.     @Override
  33.     public String performAnalysis() {
  34.         return delegate.performAnalysis();
  35.     }
  36. }
  37.  
  38.  
  39. class Main {
  40.  
  41.     // Tweak an analyzer to return 1337.
  42.     public static Analyzer tweakAnalyzer(Analyzer untweakedAnalyzer) {
  43.         return new AnalyzerDecorator(untweakedAnalyzer) {
  44.             @Override
  45.             public int computeValue() {
  46.                 return 1337;              // tweaked value!
  47.             }
  48.         };
  49.     }
  50.  
  51.     // Test the analyzer tweaking.
  52.     public static void main(String[] args) {
  53.         System.out.println(tweakAnalyzer(new AnalyzerImpl()).performAnalysis());
  54.     }
  55. }
  56.  
Success #stdin #stdout 0.03s 245632KB
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Standard input is empty
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Result: 5
https://ideone.com/ajIKg
language:
Java (HotSpot 12)
created:
11 years ago
visibility:
public

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