java多线程之Lock线程同步

1、线程同步：

package cn.itcast.heima2;

import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;


public class LockTest {

    /**
     * @param args
     */
    public static void main(String[] args) {
        new LockTest().init();
    }
    
    private void init(){
        final Outputer outputer = new Outputer();
        new Thread(new Runnable(){
            @Override
            public void run() {
                while(true){
                    try {
                        Thread.sleep(10);
                    } catch (InterruptedException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }
                    outputer.output("zhangxiaoxiang");
                }
                
            }
        }).start();
        
        new Thread(new Runnable(){
            @Override
            public void run() {
                while(true){
                    try {
                        Thread.sleep(10);
                    } catch (InterruptedException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }
                    outputer.output("lihuoming");
                }
                
            }
        }).start();
        
    }

    static class Outputer{
        Lock lock = new ReentrantLock();
        public void output(String name){
            int len = name.length();
            lock.lock();
            try{
                for(int i=0;i<len;i++){
                    System.out.print(name.charAt(i));
                }
                System.out.println();
            }finally{
                lock.unlock();
            }
        }
    }
}

2、ReentrantLock的Condition的await，signal的应用：

package cn.itcast.heima2;

import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

public class ThreeConditionCommunication {

    public static void main(String[] args) {
        final Business business = new Business();
        new Thread(new Runnable() {
            @Override
            public void run() {
                for (int i = 1; i <= 50; i++) {
                    business.sub2(i);
                }
            }
        }).start();
        new Thread(new Runnable() {
            @Override
            public void run() {
                for (int i = 1; i <= 50; i++) {
                    business.sub3(i);
                }
            }
        }).start();

        for (int i = 1; i <= 50; i++) {
            business.main(i);
        }
    }
    static class Business {
        Lock lock = new ReentrantLock();
        Condition condition1 = lock.newCondition();
        Condition condition2 = lock.newCondition();
        Condition condition3 = lock.newCondition();
        private int shouldSub = 1;

        public void sub2(int i) {
            lock.lock();
            try {
                while (shouldSub != 2) {
                    try {
                        condition2.await();
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                }
                for (int j = 1; j <= 10; j++) {
                    System.out.println("sub2 thread sequence of " + j
                            + ",loop of " + i);
                }
                shouldSub = 3;
                condition3.signal();
            } finally {
                lock.unlock();
            }
        }

        public void sub3(int i) {
            lock.lock();
            try {
                while (shouldSub != 3) {
                    try {
                        condition3.await();
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                }
                for (int j = 1; j <= 20; j++) {
                    System.out.println("sub3 thread sequence of " + j
                            + ",loop of " + i);
                }
                shouldSub = 1;
                condition1.signal();
            } finally {
                lock.unlock();
            }
        }

        public void main(int i) {
            lock.lock();
            try {
                while (shouldSub != 1) {
                    try {
                        condition1.await();
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                }
                for (int j = 1; j <= 100; j++) {
                    System.out.println("main thread sequence of " + j
                            + ",loop of " + i);
                }
                shouldSub = 2;
                condition2.signal();
            } finally {
                lock.unlock();
            }
        }

    }
}