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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 <T extends Calculator> void computeWithClass(Class<T> calcClass) throws Exception {
  11.              Calculator calc = calcClass.newInstance();
  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.             computeWithClass(Adder.class);
  18.             computeWithClass(Multiplier.class);
  19.         }
  20. }
  21.  
  22.  
  23.     interface Calculator {
  24.         void setA(int a);
  25.         void setB(int b);
  26.         int compute();
  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.     }
  34.     class Multiplier implements Calculator {
  35.         private int a,b;
  36.         public void setA(int a) {this.a=a;}
  37.         public void setB(int b) {this.b=b;}
  38.         public int compute() {return a*b;}
  39.     }
Success #stdin #stdout 0.08s 380224KB
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https://ideone.com/kQDFaE
language:
Java (HotSpot 12)
created:
11 years ago
visibility:
public

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