java第三季随机字符串排序

package collection_string_sort;

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

public class Collection_String_Sort {

    /**
     * 字符串排序
     */
    public void stringSort(){
        List<String> stringsList = new ArrayList();
        String base;
        base = "abcdefghijklmnopqrstuvwxyz0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
        final int len = base.length();
        int length;
        int temp;
        Random random = new Random();
        for(int i = 0;i < 10;i++){
            do{
                length = random.nextInt(10);
            }while(length == 0);
            String str = "";
            do{
                for(int j = 0;j < length;j++){
                temp = random.nextInt(len);
                str = str + base.charAt(temp);
            }
            }while(stringsList.contains(str));
            System.out.println("添加string "+i+":  "+str);
            stringsList.add(str);
        }
        System.out.println("--------------排序前----------------");
        temp = 1;
        for(String str:stringsList){
            System.out.println("String"+temp+": "+str);
            temp++;
        }
        Collections.sort(stringsList);
        System.out.println("--------------排序后----------------");
        temp = 1;
        for(String str:stringsList){
            System.out.println("String"+temp+": "+str);
            temp++;
        }
    }
    public static void main(String[] args) {
        Collection_String_Sort css = new Collection_String_Sort();
        css.stringSort();
    }

}