public class A { synchronized void funA(B b) { String name=Thread.currentThread().getName(); System.out.println(name+"进入A.foo"); try { Thread.sleep(1000); } catch(Exception e) { System.out.println(e.getMessage()); } System.out.println(name+"调用B类中的last()方法"); b.last(); } synchronized void last() { System.out.println("A类中的last()方法"); } } public class B { synchronized void funB(A a) { String name=Thread.currentThread().getName(); System.out.println(name+"进入B类中"); try { Thread.sleep(1000); } catch(Exception e) { System.out.println(e.getMessage()); } System.out.println(name+"调用A类中的last()方法"); a.last(); } synchronized void last() { System.out.println("B类中的last()方法"); } } public class DeadLockDemo implements Runnable{ A a=new A(); B b=new B(); DeadLockDemo() { Thread.currentThread().setName("Main-->>Thread"); new Thread(this).start(); a.funA(b); System.out.println("main线程运行完毕"); } public void run() { Thread.currentThread().setName("Test-->>Thread"); b.funB(a); System.out.println("其他线程运行完毕"); } public static void main(String args[]) { new DeadLockDemo(); } }