關於java死鎖的一個好demo。要避免dead-lock，就應該控制同步的數量和可能共用的資源的訪問（代碼源於網上，略加修改）
/**
* @author yicong
* @date 2016年3月22日 下午1:44:32
* @todo 死鎖的經典例子
*/
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";
// 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");
// Pause for a bit, simulating some file I/O or
// something. Basically, we just want to give the
// other thread a chance to run. Threads and deadlock
// are asynchronous things, but we're trying to force
// deadlock to happen here...
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) {
}
// Then it tries to lock resource1. But wait! Thread 1
// locked resource1, and won't release it 'till it
// gets a lock on resource2. This thread holds the
// lock on resource2, and won't release it 'till it
// gets resource1. We're at an impasse(僵局). Neither
// thread can run, and the program freezes up.
synchronized (resource1) {
System.out.println("Thread 2: locked resource 1");
}
}
}
};
// Start the two threads. If all goes as planned, deadlock will occur, and the program will never exit.
t1.start();
t2.start();
}
}