答案與一些問題

package org.wiyi.parent;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

public class Test4 {

	public static void main(String[] args) {
		Button b = new Button() ;
		b.addActionListener(new MyActionListener()) ;
		b.buttonPressed() ;
	}
}


class Button {
	List<ActionListener> ar = new ArrayList<ActionListener>() ;
	
	public void buttonPressed() {
		ActionEvent ae = new ActionEvent(System.currentTimeMillis(),this) ;
		
		for (Iterator<ActionListener> it = ar.iterator(); it.hasNext();) {
			ActionListener l = it.next() ;	
			l.actionPerformed(ae) ;
		}
		
	}
	
	public void addActionListener(ActionListener l) {
		ar.add(l) ;
	}
}

interface ActionListener {
	public void actionPerformed(ActionEvent ae) ;
}

class ActionEvent {
	long times ;
	Object source ;
	
	public ActionEvent(long times, Object source) {
		this.times = times ;
		this.source = source ;
	}
	
	public long getTitmes() {
		return times ;
	}
	
	public Object getSource() {
		return source ;
	}
}

class MyActionListener implements ActionListener {
	public void actionPerformed(ActionEvent ae) {
		System.out.println("button pressed") ;
	}
}

void createBinaryTree(tree root)
{
    char ch ;
    printf("請輸入節點的值:") ;
    scanf(" %c", &ch) ;

    if(ch == '#')
    {
        root = NULL ;
    }
    else
    {
        root = (tree)malloc(sizeof(struct btree)) ;
        root->date = ch ;
        createBinaryTree(root->lchild) ;
        createBinaryTree(root->rchild) ;
    }
}

import java.io.File;


public class Rename {
	public static void main(String[] args) {
		File f = new File("e:/video/english/2初級文法") ;
		File f2 = null ;
		//System.out.println(f.getName()) ;
		
		File[] files = f.listFiles() ;
		
		
		for(int i=0;i<files.length;i++) {
			if(!files[i].isDirectory()) {
				String filename = "\\" + files[i].getName().substring(5,files[i].getName().length()) ;
				String dir = files[i].getParent() ;
				
				f2 = new File(dir + filename) ;
				files[i].renameTo(f2) ;
				
				System.out.println(dir + filename) ;
			}
		}
	}

}