Detailed introduction to java thread lock and instance code

java thread lock

Use synchronized keywords in Java threads to achieve synchronization

synchronized can lock methods, lock classes, lock objects, lock code blocks

Method lock

 // The synchronization lock added to the method is this public synchronized void print() { System.out.println("Synchronized method"); try { Thread.sleep(3000); } catch (InterruptedException e) { e.printStackTrace(); } }

Class lock

 public synchronized void print(String msg) { // Class lock synchronized (MyThread.class) { System.out.println(msg); try { Thread.sleep(3000); } catch (InterruptedException e) { e.printStackTrace(); } } }

Object lock

Take the train tickets as an example

 public class Window extends Thread { public Window(String name) { super(name); } static int tick = 100; static String obj = new String(); @Override public void run() { // Start selling tickets while (tick > 0) { // Synchronize code block// A lock key// All threads must queue here synchronized (obj) { if (tick > 0) { System.out.println(getName() + "Selled the [" + tick + "] ticket");// Lost the cpu resource tick--; } } try { Thread.sleep(100); } catch (InterruptedException e) { e.printStackTrace(); } } }}

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