package randomcharacter;

import java.util.ArrayList;

import java.util.Collections;

import java.util.List;

import java.util.Random;

public class RandomCharacter {

public void randomChar() {

//創建一個數組

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

//創建一個random對象

Random random = new Random();

//創建10條字符串

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

//創建一個字符串

String str = "";

do {

//創建字符串長度(小于10的隨機數字)

int strLength = random.nextInt(10);

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

//每次隨機生成一個字符

int randomNum = random.nextInt(62);

char tempChar;

if(randomNum<10) {

tempChar = (char)(randomNum + 48);

}else if(randomNum>=10 && randomNum<36) {

tempChar = (char)(randomNum + 55);

}else {

tempChar = (char)(randomNum + 61);

}

str = str + tempChar;

}

}while(stringList.contains(str));

stringList.add(str);

System.out.println("成功添加第"+(i+1)+"個字符串："+str);

}

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

int beforeSortingNum=1;

for(String string:stringList) {

System.out.println("第"+(beforeSortingNum++)+"個元素："+string);

}

Collections.sort(stringList);

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

int afterSortingNum=1;

for(String string:stringList) {

System.out.println("第"+(afterSortingNum++)+"個元素："+string);

}

}

}

=============================================================================

package randomcharacter;

public class Test {

public static void main(String[] args) {

RandomCharacter rc = new RandomCharacter();

rc.randomChar();

}

}