java synchronized线程同步

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这个就相当于Qt5里面的 QMutex互斥量，在一个线程使用一个公共资源之前调用 mutex.lock(),锁住后只允许当前线程调用此资源其余线程等待，然后调用 mutex.unlock()解锁，解锁后大家都可以抢，然后又有一个锁定。。。

HanThread.java

package threadsafe;public class HanThread extends Thread{private static int i;static{i=0;}public static int getI(){return HanThread.i;}public  HanThread() {// TODO Auto-generated constructor stub}@Overridepublic void run() {// TODO Auto-generated method stubint i=0;while(i<10){HanThread.i=HanThread.i+1;Singleton.Printf();i++;}}}

Singleton.java

package threadsafe;public class Singleton {public static   void Printf(){   System.out.println("A");   System.out.println("b");   System.out.println("C");   System.out.println("D");   System.out.println("E");   System.out.println("F");   System.out.println("G");   System.out.println("H");   System.out.println("I");   System.out.println("J");   System.out.println("K");   System.out.println("L");   System.out.println(HanThread.getI());}}

HanEntity.java

package threadsafe;public class HanEntity {public static void main(String[] args){HanThread thread1=new HanThread();HanThread thread2=new HanThread();thread1.start();thread2.start();}}

运行结果：

AbCDEAbCDEFGHIJKL2AbCDEFGFGHIJKL3AbCDEFGHIJKL4AbCDEFGHIJKL5AbCDEFGHIJKL6AbCDEFGHHIJKL7AbCDEFGHIJKL8AbCDEFGHIJKL9AbCDEFGHIJKL10AbCDEFGHIJKL11AbCDEFGHIJKL12AbCDEFGHIJKL13AbCDEFGHIJKL14AbCDEFGHIJKL15AbCDEFGIJKL16AbCDEFGHIJKLHIJKL1717AbCDEFGHIJKL18AbCDEFGHIJKL19AbCDEFGHIJKL20

使用了 synchronized的版本

HanThread.java

package threadsafe;public class HanThread extends Thread{private static int i;static{i=0;}public static int getI(){return HanThread.i;}public  HanThread() {// TODO Auto-generated constructor stub}@Overridepublic void run() {// TODO Auto-generated method stubint i=0;while(i<10){HanThread.i=HanThread.i+1;Singleton.Printf();i++;}}}

Singleton.java

package threadsafe;public class Singleton {public static synchronized  void Printf(){   System.out.println("A");   System.out.println("b");   System.out.println("C");   System.out.println("D");   System.out.println("E");   System.out.println("F");   System.out.println("G");   System.out.println("H");   System.out.println("I");   System.out.println("J");   System.out.println("K");   System.out.println("L");   System.out.println(HanThread.getI());}}

HanEntity.java

package threadsafe;public class HanEntity {public static void main(String[] args){HanThread thread1=new HanThread();HanThread thread2=new HanThread();thread1.start();thread2.start();}}

运行结果：

AbCDEFGHIJKL2AbCDEFGHIJKL3AbCDEFGHIJKL4AbCDEFGHIJKL4AbCDEFGHIJKL5AbCDEFGHIJKL6AbCDEFGHIJKL8AbCDEFGHIJKL9AbCDEFGHIJKL10AbCDEFGHIJKL11AbCDEFGHIJKL12AbCDEFGHIJKL13AbCDEFGHIJKL14AbCDEFGHIJKL14AbCDEFGHIJKL15AbCDEFGHIJKL16AbCDEFGHIJKL17AbCDEFGHIJKL18AbCDEFGHIJKL19AbCDEFGHIJKL20

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