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  1. import java.lang.reflect.*;
  2. class RefSamp {
  3.     public int times = 0;
  4.     public RefSamp(int t) {
  5.         this.times = t;
  6.     }
  7.     public void hello(String msg) {
  8.         this.hello(msg, this.times);
  9.     }
  10.     public void hello(String msg, int t) {
  11.         System.out.println("Hello, " + msg + " x " + t);
  12.     }
  13. }
  14.  
  15. public class Main {
  16.     public static void main(String[] args) throws Exception {
  17.         Class clazz = RefSamp.class;
  18.         Constructor<?> cons = clazz.getConstructor(int.class);
  19.         RefSamp rs = (RefSamp) cons.newInstance(256);
  20.         Field f = clazz.getField("times");
  21.         f.set(rs, 2);
  22.         System.out.println(f.get(rs));
  23.         Method m = clazz.getMethod("hello", String.class, int.class);
  24.         m.invoke(rs, "refrection!", 128);
  25.         boolean pubc = Modifier.isPublic(clazz.getModifiers());
  26.         boolean finm = Modifier.isFinal(m.getModifiers());
  27.     }
  28. }
Success #stdin #stdout 0.06s 2841600KB
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Hello, refrection! x 128
https://ideone.com/yLwAJh
language:
Java (HotSpot 12)
created:
6 years ago
visibility:
secret

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