java第六章课后题答案解析_Java入门第三季第6章 Java 中的集合框架（下） 6-5 课后作业答案（改进）...

参考了其他同学的思路，简化了一下自己的算法，源文件为Test.java

import java.util.ArrayList;

import java.util.Collections;

import java.util.List;

import java.util.Random;

public class Test03 {

private static List stringList;

private static String finalString;

public static void main(String[] args) {

stringList = new ArrayList<>();

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

do {

createString();

} while (stringList.contains(finalString));

stringList.add(finalString);

}

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

listOut(stringList);

Collections.sort(stringList);

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

listOut(stringList);

}

private static void createString() {

Random random = new Random();

StringBuffer sb = new StringBuffer();

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

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

//以下为Test02.java的改进之处

String raw = "123456789QWERTYUIOPASDFGHJKLZXCVBNMqwertyuiopasdfghjklzxcvbnm";

sb.append(raw.charAt(random.nextInt(raw.length())));

}

finalString = sb.toString();

}

private static void listOut(List stringList) {

for (String string : stringList) {

System.out.println("元素："+string);

}

}

}