貼一下自己代碼，看有木有要改進的地方

package com.imooc;

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

public class CollectionsTest {
?? ?
??? public void testRandomStringSort(){
?? ??? ?String az09 = "0123456789QWERTYUIOPASDFGHJKLZXCVBNMqwertyuiopasdfghjklzxcvbnm";
?? ??? ?List<String> stringList = new ArrayList<String>();
?? ??? ?Random rd= new Random();
?? ??? ?for(int i=0;i<10;i++){
?? ??? ??? ?int strLength = rd.nextInt(9)+1;
?? ??? ??? ?String strRandom = "";
?? ??? ??? ?do{
?? ??? ??? ??? ?strRandom = "";
?????? ??? ??? ?for(int j=0;j<strLength;j++){
?????? ??? ??? ??? ?int num = rd.nextInt(az09.length());
?????? ??? ??? ??? ?strRandom += az09.charAt(num);
?????? ??? ??? ?}?? ?
?? ??? ??? ?}while(stringList.contains(strRandom));
?? ??? ??? ?stringList.add(strRandom);
?? ??? ??? ?System.out.println("成功添加:"+strRandom);
?? ??? ?}
?? ??? ?System.out.println("——————排序前————————");
?? ??? ?Collections.sort(stringList);
?? ??? ?for(String str:stringList){
?? ??? ??? ?System.out.println("元素:"+str);
?? ??? ?}
?? ??? ?
??? }
?? ?public static void main(String[] args) {
?? ??? ?// TODO Auto-generated method stub
?? ??? ?CollectionsTest clt = new CollectionsTest();
?? ??? ?
?? ??? ?clt.testRandomStringSort();
?? ?}

}

zzl7

2016-01-13

源自：Java入門第三季 6-5

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3 回答

nashi
2016-02-10

????public?static?String?randomString(int?length){
????????StringBuilder?sb?=?new?StringBuilder(length);
????????for(int?i=0;i<length;i++){
????????????sb.append((char)(ThreadLocalRandom.current().nextInt(33,128)));
????????}
????????return?sb.toString();
????}
????
????public?void?testSort2(){
????????List<String>?stringList?=?new?ArrayList<String>();
????????Random?random?=?new?Random();
????????System.out.println("----preSort-----");
????????String?k;
????????for(int?i=0;i<10;i++){
????????????do{
????????????????k=randomString(random.nextInt(11));
????????????????System.out.println("Element:"+k);
????????????}while(stringList.contains(k));
????????}
????????Collections.sort(stringList);
????????System.out.println("----postSort-----");
????????for(String?string:?stringList){
????????????System.out.println("Element:"+string);
????????}
????}

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梁XX
2016-01-30

????????????????Random?number?=?new?Random();
		int?length;
		do{
		length?=number.nextInt(11);//規定1-10?的長度，返回一個1-10的其中一個數
		}while(length?==0);
		
		//可以考慮改進的地方
		//可以就是把字符都塞進去一個List中，就不用自己這么麻煩