import java.util.List;

import java.util.Random;

import java.util.ArrayList;

import java.util.Collection;

import java.util.Collections;

public class CollectionsTest {public void testSort2(){

List<String> strings=new ArrayList<String>();

int length;

String str="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";

StringBuffer sb=new StringBuffer();

Random random=new Random();

String str1;

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

//循環(huán)避免重復(fù)

do{

sb.setLength(0);//字符串置空

length=random.nextInt(10);//產(chǎn)生10以內(nèi)的字符串長度

//拼接字符串

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

int number=random.nextInt(62);

sb.append(str.charAt(number));

}

}while(strings.contains(sb.toString()) || sb.length()==0);//sb.length()==0避免產(chǎn)生一個空字符串

strings.add(sb.toString());

}

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

for (String string : strings) {

System.out.println("元素："+string);

}

Collections.sort(strings);

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

for (String string : strings) {

System.out.println("元素："+string);

}

}

public static void main(String[] args) {

// TODO Auto-generated method stub

CollectionsTest cTest=new CollectionsTest();

//cTest.testSort1();

cTest.testSort2();

}

}