showmethods.java

the souce code of thinking in java (1-10),if you want to learn java ,please read it and you will get

//: c10:ShowMethods.java
// Using reflection to show all the methods of a class,
// even if the methods are defined in the base class.
// {Args: ShowMethods}
// From 'Thinking in Java, 3rd ed.' (c) Bruce Eckel 2002
// www.BruceEckel.com. See copyright notice in CopyRight.txt.
import java.lang.reflect.*;
import java.util.regex.*;

public class ShowMethods {
  private static final String usage =
    "usage: \n" +
    "ShowMethods qualified.class.name\n" +
    "To show all methods in class or: \n" +
    "ShowMethods qualified.class.name word\n" +
    "To search for methods involving 'word'";
  private static Pattern p = Pattern.compile("\\w+\\.");
  public static void main(String[] args) {
    if(args.length < 1) {
      System.out.println(usage);
      System.exit(0);
    }
    int lines = 0;
    try {
      Class c = Class.forName(args[0]);
      Method[] m = c.getMethods();
      Constructor[] ctor = c.getConstructors();
      if(args.length == 1) {
        for(int i = 0; i < m.length; i++)
          System.out.println(
            p.matcher(m[i].toString()).replaceAll(""));
        for(int i = 0; i < ctor.length; i++)
          System.out.println(
            p.matcher(ctor[i].toString()).replaceAll(""));
        lines = m.length + ctor.length;
      } else {
        for(int i = 0; i < m.length; i++)
          if(m[i].toString().indexOf(args[1]) != -1) {
            System.out.println(
              p.matcher(m[i].toString()).replaceAll(""));
            lines++;
          }
        for(int i = 0; i < ctor.length; i++)
          if(ctor[i].toString().indexOf(args[1]) != -1) {
            System.out.println(p.matcher(
              ctor[i].toString()).replaceAll(""));
            lines++;
          }
      }
    } catch(ClassNotFoundException e) {
      System.out.println("No such class: " + e);
    }
  }
} ///:~