Java List/ArrayList操作示例----添加/排序/取子块/删除/追加元素

//示例演示了对 List/ArrayList元素操作，仅供参考，欢迎批评指正

package com.study.jausagetest;

import java.util.*;
import java.lang.Double;
import java.lang.System;
import java.util.ArrayList;

public class TestList {
	private ArrayList<Double> list = new ArrayList<Double>();
	
	public void Display(){
		if (list.isEmpty()){
			System.out.println("The list is empty!");
		}
	}
	
	//添加/排序/取子块/删除/追加元素
	public void ListElementOperate(){
		Double tmp = Double.valueOf(3.5);
		list.add(tmp);
		System.out.println(list.size());
		list.add(5.6);
		System.out.println(list.indexOf(tmp));
		list.add(1.6);
		list.add(7.5);
		list.add(9.1);
		list.add(10.3);
		list.add(2.6);
		System.out.println(list.size());
		
		
		System.out.println("Before sort:");
		for(Double temp : list){
			System.out.println(temp);
		}
		
		Collections.sort(list);
		
		System.out.println("After sort:");
		for(Double temp : list){
			System.out.println(temp);
		}
		
		int end = 5;
		int start = 1;
		List<Double> tmpList = new ArrayList<Double>(5);
		tmpList = list.subList(start, end);		
		System.out.println("subList:");
		for(Double temp : tmpList){
			System.out.println(temp);
		}
		
		list.remove(0);
		list.add(15.7);
		
		System.out.println("After remove/add:");
		for(Double temp : list){
			System.out.println(temp);
		}
		
		tmpList = list.subList(start, end);		
		System.out.println("subList:");
		for(Double temp : tmpList){
			System.out.println(temp);
		}
	}    
}
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