Java入门第三季 6-5 应用 Collections.sort() 实现List排序

参考代码

package com.imooc.lession03;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Random;

public class Test {

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

    public void listAdd() {

        // 所需要的字符数组
        String[] charSeed = { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9",
                "a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l",
                "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x",
                "y", "z", "A", "B", "C", "D", "E", "F", "G", "H", "I", "J",
                "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V",
                "W", "X", "Y", "Z" };

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

            // str保存产生的单条随机字符串
            String str = "";

            // length保存单条字符串的长度
            int length = 0;

            //生成字符串随机长度值，防止出现长度为0情况
            do {
                length = random.nextInt(10);
            } while (length == 0);

            //生成随机字符串，防止出现重复字符串
            do {
                for (int j = 0; j < length; j++) {
                    str = str + charSeed[random.nextInt(62)];
                }
            } while (strList.contains(str));

            strList.add(str);
        }

    }

    public static void main(String[] args) {

        Test ts = new Test();
        ts.listAdd();
        System.out.println("--------------排序前-----------");
        for (String str : ts.strList) {
            System.out.println("长度为:" + str.length() + "  " + str);
        }
        Collections.sort(ts.strList);
        System.out.println("--------------排序后-----------");
        for (String str : ts.strList) {
            System.out.println("长度为:" + str.length() + "  " + str);
        }
    }

}