listing28.6.java

来自「java 完全探索的随书源码」· Java 代码 · 共 65 行

/*
 * 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
      Class provClass = Class.forName("Provider");
      Constructor con[] = provClass.getDeclaredConstructors();
      for (int x=0; x<con.length; x++)
        System.out.println("Constructor " + x + " = " + con[x]);

      // get an array of Provider method information
      Method meth[] = provClass.getDeclaredMethods();
      for (int x=0; x<meth.length; x++)
        System.out.println("Method " + x + " = " + meth[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 and methods declared by Provider
    Requestor req = new Requestor();
    req.requestConstuctors();
  }
}

/*
 *  Provider
 */
class Provider {
  String attribute;

  // construct with a String to assign to the attribute
  public Provider(String s) {
    attribute = s;
  }

  // construct with an int to assign to the attribute
  private Provider(int i) {
    attribute = String.valueOf(i);
  }

  // set the attribute String
  public void setAttribute(String attribute) {
    this.attribute = attribute;
  }

  // get the attribute String
  public String getAttribute() {
    return attribute;
  }
}