问题一：为什么同步方法中synchronized后面不用跟个（某个object），而同步代码块中却有，
问题二：下面这段代码，我是这么理解的：两个线程必定有一个先运行把。假设t1先运行，锁定了resource1然后进入了同步代码块，这时t1线程就会一直运行下去。直至同步代码块运行结束。也就是说在此期间t2根本没机会锁定resource2，怎么出现死锁啊，不知道我哪里理解有问题。请大侠指点。
public class Deadlock {
public static void main(String[ ] args) {
// These are the two resource objects we'll try to get locks for
final Object resource1 = "resource1";
final Object resource2 = "resource2";
int a=0;
// Here's the first thread. It tries to lock resource1 then resource2
Thread t1 = new Thread( ) {
public void run( ) {
// Lock resource 1
synchronized(resource1) {
System.out.println("Thread 1: locked resource 1");
try { Thread.sleep(50); }
catch (InterruptedException e) { }
// Now wait 'till we can get a lock on resource 2
synchronized(resource2) {
while(true){
System.out.println("Thread 1: locked resource 2");
try { Thread.sleep(10000); }
catch (InterruptedException e) { }
}
}
}
}
};
// Here's the second thread. It tries to lock resource2 then resource1
Thread t2 = new Thread( ) {
public void run( ) {
// This thread locks resource 2 right away
synchronized(resource2) {
System.out.println("Thread 2: locked resource 2");
// Then it pauses, just like the first thread.
try { Thread.sleep(50); }
catch (InterruptedException e) { }
synchronized(resource1) {
System.out.println("Thread 2: locked resource 1");
}
}
}
};
t1.start( );
t2.start( );
}
}
------解决方案--------------------
第一个 问题 ~~ 调用任何synchronized 方法时，对象就会被锁定，不可再调用那个对象的其他任何synchronized 方
法，除非第一个方法完成了自己的工作，并解除锁定。