java-synchronized 嵌套使用代码详解

//死锁的实现
classA
{
publicvoidget(){
System.out.println("A说:我开始启动了，B，给我你的资源");
}
publicvoidsay(){
System.out.println("A获得资源");
}
}
classB
{
publicvoidget(){
System.out.println("B说:我开始启动了，A，给我你的资源");
}
publicvoidsay(){
System.out.println("B获得资源");
}
}
classMyThreadimplementsRunnable
{
publicstaticAa=newA();
publicstaticBb=newB();
publicbooleanflag=false;
publicvoidrun(){
if(flag){
synchronized(a){
a.get();
try{
Thread.sleep(500);
}catch(InterruptedExceptione){}
synchronized(b){ //此同步代码块在另一同步代码块里
a.say();
}
}
}else{
synchronized(b){
b.get();
try{
Thread.sleep(500);
}catch(InterruptedExceptione){}
synchronized(a){ //此同步代码块在另一同步代码块里
b.say();
}
}
}
}
}
publicclassDemo24
{
publicstaticvoidmain(Stringargs[]){
MyThreadmt1=newMyThread();
MyThreadmt2=newMyThread();
mt1.flag=true;
mt2.flag=false;
Threadth1=newThread(mt1);
Threadth2=newThread(mt2);
th1.start();
th2.start();
}
}