线程状态

阻塞状态

import lombok.SneakyThrows;import java.text.SimpleDateFormat;public class T {@SneakyThrowspublic static void main(String[] args) {new Thread(() -> {synchronized (T.class) {try {Thread.sleep(6000);System.out.println(new SimpleDateFormat("yyyy:MM:dd hh:mm:ss sss").format(System.currentTimeMillis()) + ":"+ Thread.currentThread().getName() + "Locked");} catch (Exception e) {e.printStackTrace();}}}, "线程1").start();new Thread(() -> {synchronized (T.class) {/*new Object()，不同锁，不阻塞线程2争抢时间片*/try {System.out.println(new SimpleDateFormat("yyyy:MM:dd hh:mm:ss sss").format(System.currentTimeMillis()) + ":"+ Thread.currentThread().getName() + "Locked");} catch (Exception ex) {}}}, "线程2").start();}}

等待

import lombok.SneakyThrows;import java.text.SimpleDateFormat;
import java.util.concurrent.TimeUnit;public class T {@SneakyThrowspublic static void main(String[] args) {Object o = new Object();new Thread(() -> {synchronized (o) {try {System.out.println(new SimpleDateFormat("yyyy:MM:dd hh:mm:ss sss").format(System.currentTimeMillis()) + ":"+ Thread.currentThread().getName() + "=》5s后才能继续执行");o.wait();} catch (Exception e) {e.printStackTrace();}}}, "线程1").start();new Thread(() -> {synchronized (o) {try {TimeUnit.SECONDS.sleep(5);System.out.println(new SimpleDateFormat("yyyy:MM:dd hh:mm:ss sss").format(System.currentTimeMillis()) + ":"+ Thread.currentThread().getName() + "唤醒");o.notify();//注释此行，永久Waiting} catch (Exception ex) {}}}, "线程2").start();}
}