reflection

 1 import java.lang.reflect.Constructor;
 2 public class TestList {
 3  public static void main(String args[]) throws Exception {
 4   Class c = Class.forName("com.**.MyClass");
 5   //getDeclaredConstructors() reflecting all the constructors declared by the class
 6   //getConstructors() just reflect the public constructors
 7   Constructor constructors[] = c.getDeclaredConstructors();
 8      Object obj = null;
 9      for (Constructor cons : constructors) {
10        Class[] params = cons.getParameterTypes();
11        if (params.length == 1 && params[0] == int.class) {
12          obj = cons.newInstance(10);
13          break;
14        }
15        
16      }
17      if (obj == null) {
18        System.out.println("Can’t Create MyClass object.");
19        return;
20      }
21  }
22 }
23  
24  
25  
26 public class MyClass {
27  private int count;
28  MyClass(int c) {
29   System.out.println("MyClass(int):" + c);
30   count = c;
31  }
32  MyClass() {
33   System.out.println("MyClass()");
34   count = 0;
35  }
36  void setCount(int c) {
37   System.out.println("setCount(int): " + c);
38   count = c;
39  }
40  int getCount() {
41   System.out.println("getCount():" + count);
42   return count;
43  }
44  void showcount() {
45   System.out.println("count is " + count);
46  }
47 }
48