Java關(guān)于io和多線程的編程題，求代碼

package?know;

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import?java.io.BufferedReader;

import?java.io.FileInputStream;

import?java.io.IOException;

import?java.io.InputStreamReader;

import?java.util.HashMap;

import?java.util.Map;

import?java.util.Scanner;

public?class?T20?{

public?static?void?main(String[]?args)?throws?IOException?{

Scanner?s=new?Scanner(System.in);

String?username=null;

String?password=null;

System.out.println("輸入用戶名：");

while(true){

if(username==null){

username=s.next();

System.out.println("輸入密碼：");

}else{

password=s.next();

}

if(password!=null){

s.close();

break;

}

}

BufferedReader?br=null;

MapString,?String?map=new?HashMapString,?String();

try{

br=new?BufferedReader(new?InputStreamReader(new?FileInputStream("d:/test.txt")));

String?temp=null;???

while((temp=br.readLine())!=null){

String[]?ss=temp.split("=");

map.put(ss[0],?ss[1]);

}

}catch(IOException?e){

throw?e;

}finally{

if(br!=null)

br.close();

}

String?u=map.get("userName");

String?p=map.get("password");

if(u.equals(username)p.equals(password)){

System.out.println("登錄成功");

}else{

System.out.println("用戶名或密碼錯誤");

}

}

}

package?know;

public?class?T21?{

public?static?void?main(String[]?args)?throws?InterruptedException?{

String[]?persons=new?String[]{"甲","乙","丙","丁","午","己","庚","辛","壬","癸"};

for(int?i=0;ipersons.length;i++){

System.out.println(persons[i]+"正在過山洞");

Thread.sleep(5000);

}

}

}

最后一個百度搜一個就行了，肯定比我畫的好

java題目 編程題目 多線程

public class DoubleThread {

public static void main(String[] args) {

Thread t1 = new Thread() {

@Override

public void run() {

for (char i = 'a'; i = 'z'; i++) {

System.out.println(i);

}

}

};

Thread t2 = new Thread() {

@Override

public void run() {

for (char i = 'A'; i = 'Z'; i++) {

System.out.println(i);

}

}

};

t1.start();

t2.start();

}

}

java關(guān)于線程的題兩道- -

public?class?ThreadTest?{

public?static?void?main(String[]?args)?{

//?================Q1?START================

SubThread?T1?=?new?SubThread("Frist");

SubThread?T2?=?new?SubThread("Second");

SubThread?T3?=?new?SubThread("Third");

T1.start();

T2.start();

T3.start();

//?================Q1?FINISHED================

//?================Q2?START================

//?MulThread?mThread?=?new?MulThread();

//?Thread?t1?=?new?Thread(mThread);

//?Thread?t2?=?new?Thread(mThread);

//?Thread?t3?=?new?Thread(mThread);

//?t1.setName("t1");

//?t2.setName("t2");

//?t3.setName("t3");

//?t1.start();

//?t2.start();

//?t3.start();

//?================Q2?FINISHED================

}

}

class?MulThread?implements?Runnable?{

public?MulThread()?{

}

public?MulThread(String?name)?{

}

public?synchronized?void?run()?{

System.out.println("currentThread?Name?is??"

+?Thread.currentThread().getName());

long?sleeptime?=?(long)?new?Random().nextInt(1000);

//System.out.println((int)(Math.random()?*?1000));

//?System.out.println("sleeptime?"?+?sleeptime);

//?System.out.println("--------------------------------");

try?{

Thread.sleep(sleeptime);

}?catch?(InterruptedException?e)?{

e.printStackTrace();

}

System.out.println("Q2:MulThread?info?:?"

+?Thread.currentThread().getName()?+?"?finished");

}

}

class?SubThread?extends?Thread?{

public?SubThread(String?name)?{

super(name);

}

public?synchronized?void?run()?{

for?(int?i?=?0;?i??5;?i++)?{

System.out.println("Thread?"?+?this.getName()?+?"??is?running?the?"

+?(i?+?1)?+?"?times");

try?{

long?sleeptime?=?(long)?new?Random().nextInt(1000);

//?System.out.println("sleeptime?"?+?sleeptime);

Thread.sleep(sleeptime);

}?catch?(InterruptedException?e)?{

e.printStackTrace();

}

}

System.out.println("Q1:SubThread?info?:?"

+?this.currentThread().getName()?+?"?finished");

}

}

java筆試題：從線程和安全說一下sleep()和wait（）的區(qū)別

這兩者的施加者是有本質(zhì)區(qū)別的.

sleep()是讓某個線程暫停運行一段時間,其控制范圍是由當(dāng)前線程決定,也就是說,在線程里面決定.好比如說,我要做的事情是 "點火-燒水-煮面",而當(dāng)我點完火之后我不立即燒水,我要休息一段時間再燒.對于運行的主動權(quán)是由我的流程來控制.

而wait(),首先,這是由某個確定的對象來調(diào)用的,將這個對象理解成一個傳話的人,當(dāng)這個人在某個線程里面說"暫停!",也是thisOBJ.wait(),這里的暫停是阻塞,還是"點火-燒水-煮

當(dāng)前名稱：java線程筆試代碼題,java線程編程題
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