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  1. import java.lang.reflect.Constructor;
  2. import java.util.Arrays;
  3.  
  4. class Example
  5. {
  6.     public Example(String a) {
  7.         System.out.println("(String): " + a);
  8.         // ...
  9.     }
  10.  
  11.     public Example(int a, String b) {
  12.         System.out.println("(int, String): " + a + ", " + b);
  13.         // ...
  14.     }
  15.  
  16.     public Example(String a, String b) {
  17.         System.out.println("(String, String): " + a + ", " + b);
  18.         // ...
  19.     }
  20.  
  21.     static Example create(Object... params) {
  22.         try {
  23.             Class[] paramTypes = new Class[params.length];
  24.             for (int n = 0; n < params.length; ++n) {
  25.                 Class cls = params[n].getClass();
  26.                 if (cls.equals(Integer.class)) { // You may need this (for int and other primitives)
  27.                     paramTypes[n] = Integer.TYPE;
  28.                 } else {
  29.                     paramTypes[n] = cls;
  30.                 }
  31.             }
  32.             Constructor ctor = Example.class.getConstructor(paramTypes);
  33.             return (Example)ctor.newInstance(params);
  34.         } catch (Exception e) {
  35.             System.out.println(e.getMessage());
  36.             e.printStackTrace(System.out);
  37.             throw new IllegalArgumentException("parameters not supported");
  38.         }
  39.     }
  40.  
  41.     public static void main(String[] args)
  42.     {
  43.         Example e1 = Example.create("foo");
  44.         Example e2 = Example.create(1, "foo");
  45.         Example e3 = Example.create("foo", "bar");
  46.     }
  47. }
  48.  
Success #stdin #stdout 0.1s 27660KB
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Standard input is empty
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(String): foo
(int, String): 1, foo
(String, String): foo, bar
https://ideone.com/QXjF9H
language:
Java (HotSpot 12)
created:
7 years ago
visibility:
secret

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