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);
}
}
}