java 随機排序_JAVA集合生成10條随機字元串排序

package cn.edu.lin.task;

import java.util.ArrayList;

import java.util.Collections;

import java.util.List;

import java.util.Random;

public class CollectionsTask {

public static List listRandomString() {

String str = "qwertyuiopasdfghjklzxcvbnmQWERRTYUIOPASDFGHJKLZXCVBNM1234567890";

Random random = new Random();

List listString = new ArrayList();

String[] strArray = new String[10];

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

StringBuffer stringBuffer = new StringBuffer();

//确定字元串長度

int size = (int) (Math.random() * 10);

for (int j = 0; j < size; j++) {

int index = random.nextInt(str.length());

char c = str.charAt(index);

stringBuffer.append(c);

}

if (!(listString.contains(stringBuffer.toString()))) {

listString.add(stringBuffer.toString());

} else {

i--;

}

}

return listString;

}

public static void main(String[] args){

List strList = listRandomString();

System.out.println("--------生成10條随機字元串--------");

for(String string : strList){

System.out.println(string);

}

System.out.println("--------排序後-------------");

Collections.sort(strList);

for(String string :strList){

System.out.println(string);

}

}

}