listing28.1.java

java 完全探索的随书源码

/*
* Requestor
*/
import java.lang.reflect.*;
public class Requestor {
  public void requestConstuctors() {
    try {
      // load the Provider class and use Reflection
      // to get an array of constructor information
      Constructor con[]= Class.forName("Provider").getDeclaredConstructors();
      for (int x=0; x<con.length; x++)
        System.out.println("Constructor " + x + " = " + con[x]);
    }
    catch (ClassNotFoundException ce) {
      // Class.forName was unable to load Provider.class
      System.out.println("Could not locate class");
    }
    catch (SecurityException se) {
      // Reflection permission was not granted
      System.out.println("Not allowed to get class info");
    }
  }

  public static void main(String args[]) {
    // construct a Requestor and ask it for the
    // constructors declared by Provider
    Requestor req = new Requestor();
    req.requestConstuctors();
  }
}

/*
 *  Provider
*/
class Provider {
  public Provider(String s) {
  }

  private Provider(int i) {
  }
}