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  1. import java.lang.reflect.*;
  2.  
  3. class RefSamp {
  4.  public int times = 0;
  5.  
  6.  public RefSamp(int t) {
  7.   this.times = t;
  8.  }
  9.  
  10.  public void hello(String msg) {
  11.   this.hello(msg, this.times);
  12.  }
  13.  public void hello(String msg, int t) {
  14.   System.out.println("Hello, " + msg + " x " + t);
  15.  }
  16. }
  17.  
  18. public class Main {
  19.  public static void main(String[] args) throws Exception {
  20.   Class clazz = RefSamp.class;
  21.  
  22.   Constructor<?> cons = clazz.getConstructor(int.class);
  23.   RefSamp rs = (RefSamp) cons.newInstance(256);
  24.  
  25.   Field f = clazz.getField("times");
  26.   f.set(rs, 2);
  27.   System.out.println(f.get(rs));
  28.  
  29.   Method m = clazz.getMethod("hello", String.class, int.class);
  30.   m.invoke(rs, "refrection!", 128);
  31.  
  32.   boolean pubc = Modifier.isPublic(clazz.getModifiers());
  33.   boolean finm = Modifier.isFinal(m.getModifiers());
  34.  }
  35. }
Success #stdin #stdout 0.07s 2841600KB
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2
Hello, refrection! x 128
https://ideone.com/KdavqO
language:
Java (HotSpot 12)
created:
6 years ago
visibility:
public

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