Java thread Synchronization-synchronized

Synchronized: Synchronization (lock), can be decorated code blocks and methods, the modified code blocks and methods once accessed by a thread, it is directly locked, other threads will not be able to access

The synchronous lock object of a non-static method is this
The static method's lock synchronization object is the bytecode object of the current class

Mock train station ticketing case

Synchronizing code blocks:
public class Ticket implements Runnable {

int tickets = 100;//总票数Object obj = new Object(); //锁对象@Overridepublic void run() {    //卖票    while (true) {        synchronized (obj) {            if (tickets > 0) {                try {                    Thread.sleep(10);                } catch (InterruptedException e) {                    e.printStackTrace();                }                System.out.println(Thread.currentThread().getName() + "卖出了第" + (tickets--) + "张票");            }        }    }}

}

Synchronization method
public class Ticket implements Runnable {

int tickets = 100;//总票数Object obj = new Object(); //锁对象@Overridepublic void run() {    //卖票    while (true) {        method();    }}public synchronized void method(){    if (tickets > 0) {        try {            Thread.sleep(10);        } catch (InterruptedException e) {            e.printStackTrace();        }        System.out.println(Thread.currentThread().getName() + "卖出了第" + (tickets--) + "张票");    }}

}

Test class
public class Tickettest {
public static void Main (String args[]) {

    Ticket t = new Ticket();    Thread t1 = new Thread(t);    Thread t2 = new Thread(t);    Thread t3 = new Thread(t);    t1.setName("窗口1");    t2.setName("窗口2");    t3.setName("窗口3");    t1.start();    t2.start();    t3.start();}

}

Java thread Synchronization-synchronized