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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. /* Name of the class has to be "Main" only if the class is public. */
  8. class Ideone
  9. {
  10.         static void computeWithPrototype(Calculator proto) {
  11.              Calculator calc = proto.copy();
  12.              calc.setA(123);
  13.              calc.setB(321);
  14.              System.out.println(calc.compute());
  15.         }
  16.         public static void main(String[] args) throws Exception {
  17.             computeWithPrototype(new Adder());
  18.             computeWithPrototype(new Multiplier());
  19.         }
  20. }
  21.  
  22.     interface Calculator {
  23.         void setA(int a);
  24.         void setB(int b);
  25.         int compute();
  26.         Calculator copy();
  27.     }
  28.     class Adder implements Calculator {
  29.         private int a,b;
  30.         public void setA(int a) {this.a=a;}
  31.         public void setB(int b) {this.b=b;}
  32.         public int compute() {return a+b;}
  33.         public Calculator copy() {
  34.             Adder res = new Adder();
  35.             res.a = a;
  36.             res.b = b;
  37.             return res;
  38.         }
  39.     }
  40.     class Multiplier implements Calculator {
  41.         private int a,b;
  42.         public void setA(int a) {this.a=a;}
  43.         public void setB(int b) {this.b=b;}
  44.         public int compute() {return a*b;}
  45.         public Calculator copy() {
  46.             Multiplier res = new Multiplier();
  47.             res.a = a;
  48.             res.b = b;
  49.             return res;
  50.         }
  51.     }
Success #stdin #stdout 0.08s 380160KB
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https://ideone.com/0as5bS
language:
Java (HotSpot 12)
created:
11 years ago
visibility:
public

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