package com.imooc.collection;

import java.util.ArrayList;

import java.util.Collections;

import java.util.List;

import java.util.Random;

public class CollectionsTest4 {

public void testSort1() {

List<String> stringList = new ArrayList<String>();

// 插入十個長度在十以內的隨機字符串

? ? String base="qwertyuiopasdfghjklzxcvbnmQWERTYUIOPASDFGHJKLZXCVBNM1234567890";

Random random = new Random();

for (int i = 0; i < 10; i++) {

int m=random.nextInt(10)+1;

char [] temp=new char [m];

for(int j=0;j<m;j++){

temp[j] =base.charAt(random.nextInt(base.length()));//使用charAt返回一個char型

}

? ?String st=new String();

String ? st2=st.valueOf(temp);//調用String類中的valueOf(char[] data)返回 char 數組參數的字符串表示形式?

stringList.add(st2);

System.out.println("成功添加字符串：" + st2);

}

System.out.println("----------------排序前-------------------");

for (String string : stringList) {

System.out.println("元素：" + string);

}

Collections.sort(stringList);

System.out.println("----------------排序后-------------------");

for (String string : stringList) {

System.out.println("元素：" + string);

}

}

public static void main(String[] args) {

CollectionsTest4 ct = new CollectionsTest4();

ct.testSort1();

}

}