arraylistdemo1.java

软通公司培训的课件和习题里面有答案。。。

package com.eight.java;

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

public class ArrayListDemo1 {

	ArrayList ar = new ArrayList();
	ArrayList br = new ArrayList();
	ArrayList cr = new ArrayList();
	ArrayList list = new ArrayList();
	
	public List test(){
		list.add("苹果");
		list.add("香蕉");
		list.add("梨子");
		list.add("香蕉");            // 允许重复
		list.add("菠萝");
		list.remove("菠萝");   
		//System.out.println(list);   // 元素的顺序与加入的顺序有关
		return list;
	}
	
	public void addList(){
		this.test();
		br.add(list);              // 集合也可以作为元素.
		//br.addAll(list);
		System.out.println(br.get(0));  
	}
	
	public void addCrSize(int n){
		this.test();
		this.cr.addAll(list);
		System.out.println(cr.size());
		this.cr.clear();
		System.out.println(cr.size());
	}
	
	public static void main(String[] args) {
		ArrayListDemo1 ald = new ArrayListDemo1();
		//ald.addList();
		ald.addCrSize(5);
	}

}