线程和正则表达式

前端之家收集整理的这篇文章主要介绍了线程和正则表达式前端之家小编觉得挺不错的,现在分享给大家,也给大家做个参考。

正则表达式

正则表达式通常用于判断语句中,用来检查某一字符串是否满足某一格式。
接下来用几个常用例子来说明正则表达式的具体用法

package com.lingzhuo.Test;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class ZhengZe {
    public static void main(String[] args) {
        //邮箱
    /* Pattern p=Pattern.compile("\\w+@\\w+(\\.\\w{2,3})*\\.\\w{2,3}"); Matcher m=p.matcher("123@qq.com.cn"); boolean b=m.matches(); System.out.println(b);*/
        //电话号码
        /*Pattern p=Pattern.compile("^((13)|(15)|(18)|(17))\\d{9}$"); Matcher m=p.matcher("13140168171"); System.out.println(m.matches());*/
        //身份证号
        Pattern p=Pattern.compile("^\\d{17}(\\d{1}|x)$");
        Matcher m=p.matcher("12345678912345678x");
        System.out.println(m.matches());
        //密码6到8位字母数字下划线组合
        /*Pattern p=Pattern.compile("^\\w{6,8}$"); Matcher m=p.matcher("13_6zzz"); System.out.println(m.matches());*/
    }
}

在上边的代码中,实现了判断邮箱是否符合邮箱的基本格式,电话号码是否符合一般的电话号码形式,还有平时使用密码格式。


这里举出了常见的基本的集中正则表达式。

线程

在java中主要提供两种方式实现线程,分别为集成java.lang.Thread类与实现java.lang.Runnable接口。

继承Thread类

package com.lingzhuo.Thread;

public class SellTicketsThread extends Thread{
    @Override
    public void run() {
        // TODO Auto-generated method stub
        for (int i = 1; i < 11; i++) {
            try {
                Thread.sleep(500);
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            System.out.println(Thread.currentThread().toString()+i);
        }
    }
}

实现runnable接口

package com.lingzhuo.Thread;

public class SellRunnable implements Runnable {
    int i = 100;
    String str = "abc";

    @Override
    public void run() {
        // TODO Auto-generated method stub
        while (i > 0) {
            try {
                Thread.sleep(100);// 休眠100ms;
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } // 四个线程进入while循环之后,先进行休眠,使得进入锁的线程执行完之后不能立即与其他三个线程抢占锁。
                // (解决运行速度太快的问题)
            sell();
        }
    }
    private synchronized void sell() {
        if (i > 0) {
            System.out.println(Thread.currentThread().toString() + i);
            i--;
        }
    }
}

对两种方式进行测试:

package com.lingzhuo.Thread;

public class ThreadTest {
    public static void main(String[] args) {
        //对Thread类进行测试
        /*SellTicketsThread th1=new SellTicketsThread(); SellTicketsThread th2=new SellTicketsThread(); th1.start(); th2.start();*/
        //对实现runnable接口进行测试
        SellRunnable sr=new SellRunnable();
        Thread thread1=new Thread(sr);
        Thread thread2=new Thread(sr);
        Thread thread3=new Thread(sr);
        Thread thread4=new Thread(sr);
        thread1.start();
        thread2.start();
        thread3.start();
        thread4.start();
    }
}



1. 由运行结果可以看出,在继承Thread类中,会出现同一件事情被两个线程都运行了一次。
2. 为解决这样的问题,采用了实现runnable接口,实现数据共享。但是这中间还有问题就是由于线程运行较快,抢占cpu的顺序不确定,使得某些事情运行不到,而有些事情被多次运行。
3. 鉴于这种问题,这里使用了锁,当某一个线程进入run运行,其他线程只能等待。关键字为synchronized。

线程的wait()方法

package com.lingzhuo.Thread;

public class WaitThread implements Runnable{
    String s="abc";
    public WaitThread() {
        // TODO Auto-generated constructor stub
    }
    @Override
    public void run() {
        // TODO Auto-generated method stub
        System.out.println("进入等待run");
        synchronized (s) {
            System.out.println("等待前");
            try {
                s.wait();
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            System.out.println("等待后");
        }
    }
}

线程的唤醒

package com.lingzhuo.Thread;

public class NotifyThread implements Runnable{
    String s="abc";
    public NotifyThread() {
        // TODO Auto-generated constructor stub
    }
    @Override
    public void run() {
        // TODO Auto-generated method stub
        System.out.println("进入唤醒run");
        synchronized (s) {
            System.out.println("唤醒前");
            try {
                Thread.sleep(5000);
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            s.notify();
            System.out.println("唤醒后");
        }
    }

}
package com.lingzhuo.Thread;

public class NotifyWaitTest {
    public static void main(String[] args) {
        Thread t1=new Thread(new WaitThread());
        Thread t2=new Thread(new NotifyThread());
        t1.start();
        try {
            Thread.sleep(2000);
        } catch (InterruptedException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        t2.start();
    }
}

线程的加入

package com.lingzhuo.Thread;

public class JoinTest {
    public static void main(String[] args) {
        Thread t=new Thread(new SellRunnable());
        t.start();
        try {
            t.join();
        } catch (InterruptedException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        System.out.println("程序运行完成");
    }
}

运行结果:

线程中的死锁

package com.lingzhuo.Thread;

public class SiSuoThread implements Runnable {

    String s1;
    String s2;

    public SiSuoThread(String s11,String s22){
        this.s1=s11;
        this.s2=s22;
    }

    public void run() {
        synchronized(s1){
            System.out.println(Thread.currentThread().toString()+"持有第一个锁"+s1);
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            synchronized (s2) {
                System.out.println(Thread.currentThread().toString()+"持有第二个锁"+s2);
            }
        }
    }
}
package com.lingzhuo.Thread;

public class SiSuoTest {
    public static void main(String[] args) {
        String s1="abc";
        String s2="def";
        String s3="ghi";
        Thread thread1=new Thread(new SiSuoThread(s1,s2),"thread1");
        Thread thread2=new Thread(new SiSuoThread(s2,s3),"thread2");
        Thread thread3=new Thread(new SiSuoThread(s3,s1),"thread3");
        thread1.start();
        try {
            Thread.sleep(500);
        } catch (InterruptedException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        thread2.start();
        try {
            Thread.sleep(500);
        } catch (InterruptedException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        thread3.start();
    }
}

运行结果:

wait()和notify()方式的一个实例

生产者
package com.lingzhuo.Thread;

public class ProductedThread implements Runnable{
    ShengchanXiaofei sf2;
    public ProductedThread(ShengchanXiaofei sf) {
        // TODO Auto-generated constructor stub
        this.sf2=sf;
    }
    @Override
    public void run() {
        // TODO Auto-generated method stub
        while(true){
            sf2.product();
        }   
    }   
}
消费者
package com.lingzhuo.Thread;

public class ConsumerThread implements Runnable{
    ShengchanXiaofei sf1;
    public ConsumerThread(ShengchanXiaofei sf) {
        // TODO Auto-generated constructor stub
        this.sf1=sf;
    }
    @Override
    public void run() {
        // TODO Auto-generated method stub
        while(true){
            sf1.consumer();
        }   
    }

}
生产消费关系类
package com.lingzhuo.Thread;

public class ShengchanXiaofei {
    boolean ishave=false;
    public synchronized void product(){
        if(!ishave){
            System.out.println("开始生产");         
                shuiMian();
            System.out.println("生产完成");
            notify();
            shuiMian();
            ishave=true;
        }
    }
    public synchronized void consumer(){
        if(!ishave){
            System.out.println("没有产品,等待");
            try {
                wait();
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            System.out.println("消费");
            shuiMian();
        }
        System.out.println("消费完成");
        ishave=false;
        notify();
        shuiMian();
        shuiMian();
    }
    public static void shuiMian(){
        try {
            Thread.sleep(1000);
        } catch (InterruptedException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}
测试类
package com.lingzhuo.Thread;

public class ShengchanXiaofeiTest {
    public static void main(String[] args) {
        ShengchanXiaofei sf=new ShengchanXiaofei();
        Thread t1=new Thread(new ConsumerThread(sf));
        Thread t2=new Thread(new ProductedThread(sf));      
        t1.start();
        ShengchanXiaofei.shuiMian();
        t2.start();
    }
}

运行结果:

原文链接:/regex/360118.html

猜你在找的正则表达式相关文章