JAVA入门第三季6-5课后作业

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

public class CollectionsTest {

//定义十个随机的字符串，长度10以内随机，字符随机，字符内容不能重复
//生成一个随机字符串creatAstring方法
public String creatAstring(){
    int size=(int)(Math.random()*10+1);
    Random random=new Random();
    StringBuffer Astring=new StringBuffer();
    //生成随机数并转换成ASCII码
    char a;
    int i=0;
    if(size==0){
        a=(char)0;
                }else
    do{int ran=48+random.nextInt(75);
    if(ran>=58&&ran<=64ran>=91&&ran<=96){continue;}
    else{a=(char)ran;Astring.append(a);i++;}
    }while(i<size);
    return Astring.toString();
}

//对十个随机的字符串进行排序
public void testSort3(){
    List<String> stringRandom=new ArrayList();
    //List中添加随机的十个字符串
    for(int i=0;i<10;){
    String c=this.creatAstring();
        //判断是否出现重复内容的字符串
        if(stringRandom.contains(c)){
            continue;
            }else
    stringRandom.add(c);i++;
    }
    System.out.println("------排序前------");
    for(String str:stringRandom){
        System.out.println(str);
    }
    System.out.println("------排序后------");
    Collections.sort(stringRandom);
    for(String str:stringRandom){
        System.out.println(str);
    }
    }

public static void main(String[] args) {
CollectionsTest co=new CollectionsTest();
co.testSort3();
}

}