arraylisttest.java

一些JavaAPI测试的源代码(包括一些Java中常用的数据结构类

/**
 *Author Miracle
 *Time	2005.11.24 20:56
 *
 */

import java.util.*;

public class ArrayListTest
{
	public static void printElements(Collection c)
	{
		Iterator iterator = c.iterator();
		while (iterator.hasNext())
		{
			System.out.println(iterator.next());
		}	
	}
	
	public static void main(String[] args)
	{
		ArrayList al = new ArrayList();
		/*
		al.add("djb");
		al.add("miracle");
		al.add("hello");*/
		
		al.add(new Point(2,2));
		al.add(new Point(3,3));
		al.add(new Point(4,4));
		
		/*
		for (int i=0; i<al.size(); i++)
		{
			System.out.println(al.get(i));
		}*/
		System.out.println("**** ArrayList to Array & Array to ArrayList Test****");
		System.out.println(al);
		
		Object[] objs = al.toArray();
		for (int i=0; i<objs.length; i++)
		{
			System.out.println(objs[i]);
		}
		
		List l = Arrays.asList(objs);
		System.out.println();
		System.out.println("****** Test set List ******");
		System.out.println("before setting");
		System.out.println(l);
		//l.set(0,"BeModified");
		l.set(0,new Point(0,0));
		System.out.println("after setting");
		System.out.println(l);
		System.out.println("ye success!");	
		
		System.out.println();
		System.out.println("*******Iterator test******");	
		System.out.println("既然List和ArrayList等一些集合都有自己的输入元素方法，");
		System.out.println("为什么还要用Iterator呢？");
		System.out.println("1，它能输入任何一个集合的元素，因为集合有iterator()方法");
		System.out.println("2，可能是它还提供了一种通用的方式去访问集合中的元素，对吧！");
		Iterator ite = al.iterator();
		while(ite.hasNext())
		{
			System.out.println(ite.next());
		}
		
		System.out.println();
		System.out.println("**** Test remove from iterator ****");
		Iterator it = al.iterator();
		it.next();
		it.remove();
		while(it.hasNext())
		{
			System.out.println(it.next());
		}
		
		System.out.println();
		System.out.println("****** Test remove() ******");
		Iterator iter = l.iterator();
		//iter.next();
		//iter.remove();
		System.out.println("haha, Exception ");
		System.out.println("Remember..........");
		/*
		while (iter.hasNext())
		{
			System.out.println(iter.next());
		}*/
		
		System.out.println("****** Collection Test ******");
		System.out.println("******可以说明iterator的用途，只要传入一个Collection的子类实例就行******");
		printElements(al);
	}
}

class Point
{
	int x,y;
	Point(int x,int y)
	{
		this.x=x;
		this.y=y;
	}
	public String toString()
	{
		return "x-"+x+","+"y-"+y;
	}
}