public class SynchronizedThis {
public static void main(String[] args) {
ThisLock thisLock = new ThisLock();
new Thread("T1") {
@Override
public void run() {
thisLock.m1();
}
}.start();
new Thread("T2") {
@Override
public void run() {
thisLock.m2();
}
}.start();
}
}
class ThisLock {
public void m1() {
try {
System.out.println(Thread.currentThread().getName());
Thread.sleep(10_000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
public void m2() {
try {
System.out.println(Thread.currentThread().getName());
Thread.sleep(10_000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
以上 代码执行，线程几乎同时结束，证明程序并没有锁住，
class ThisLock {
private final Object LOCK = new Object();
public void m1() {
synchronized(LOCK) {
try {
System.out.println(Thread.currentThread().getName());
Thread.sleep(10_000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
public synchronized void m2() {
try {
System.out.println(Thread.currentThread().getName());
Thread.sleep(10_000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
以上 代码执行证明， 输出结果是先一个执行，间隔十秒 ，继续往下执行，正面证明了锁的存在，这就是this 锁的存在，
class ThisLock {
private final Object LOCK = new Object();
public void m1() {
synchronized(LOCK) {
try {
System.out.println(Thread.currentThread().getName());
Thread.sleep(10_000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
public synchronized void m2() {
try {
System.out.println(Thread.currentThread().getName());
Thread.sleep(10_000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
同样的上面的代码与步骤1是一样的结果，同时输出，证明用了两个锁，侧面证明了this 锁是存在的，
Processed:
0.010, SQL:
9
