多線程死鎖的簡單使用：

public class MyLock{
    public static final Object locka=new Object();
    public static final Object lockb=new Object();
    public static final Object lockc=new Object();
    public static final Object lockd=new Object();
}

package day_12_01_Thread;

/**
 * 死鎖的情況
 * 
 * @author Administrator
 *
 
 
*/
public class TestSynchronized implements Runnable {
    public static void main(String[] args) {
        TestSynchronized s = new TestSynchronized();
        Thread t1 = new Thread(s);
        Thread t2 = new Thread(s);

        t1.start();
        t2.start();
    }

    @Override
    public void run() {
        
 
int i = 0;
        while (true) {
            if (i % 2 == 0) {
                synchronized (MyLock.locka) {
                    System.out.println("if.......locka");
                    synchronized (MyLock.lockb) {
                        System.out.println("if ...........lockb");
                    }
                }
            } 
 
else {
                synchronized (MyLock.lockb) {
                    System.out.println("else..........lockb");
                    synchronized (MyLock.locka) {
                        System.out.println("else..........locka");
                    }
                }
            }

            i++;
        }
    }
}

多線程——死鎖