第三季练习：随机字符串排序

package list.imooc;

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

public class StringSort 
{
//创建list容器存放String字符串
public List<String> list= new ArrayList<String>();

//构造函数，用于初始化10条随机字符串
public StringSort()
{
    String str = new String();
    for(int i=0;i<10;i++)
    {
        do
        {
            str = CreatRandomString();
        }while( list.contains(str) );
        list.add(str);
    }
}

//生成随机字符串
public String CreatRandomString()
{
    Random random = new Random();
    int size = random.nextInt(10)+1;
    String str = "zxcvbnmlkjhgfdsaqwertyuiop1234567890";
    StringBuilder sber = new StringBuilder();
    while(size-- > 0)
    {
        sber.append(str.charAt(random.nextInt(str.length())));
    }
    return sber.toString();
}

//对10条字符串排序并且打印输出到屏幕
public void sortprint()
{
    System.out.println("-------------排序前------------");
    int i=1;
    for(String str : list)
    {
        System.out.println(i+".  "+str);
        i++;
    }
    i=1;
    Collections.sort(list);
    System.out.println("-------------排序后------------");
    for(String str : list)
    {
        System.out.println(i+".  "+str);
        i++;
    }
}

public static void main(String[] args) 
{
    System.out.println("字符串排序程序开始！");
    StringSort sst = new StringSort();
    sst.sortprint();
    System.out.println("字符串排序程序结束！");
}

}