wait/notify/notifyAll在Object類中
因為我們在使用synchronized鎖 對象鎖可以是任意對象，所以wait/notify/notifyAll需要放在Object類中。
wait/notify/簡單的用法
public class Thread03 extends Thread {
@Override
public void run() {
try {
synchronized (this) {
System.out.println(Thread.currentThread().getName() + “>>當前線程阻塞，同時釋放鎖!<<”);
this.wait();
}
System.out.println(">>run()<<");
} catch (InterruptedException e) {

} }public static void main(String[] args) {Thread03 thread = new Thread03();thread.start();try {Thread.sleep(3000);} catch (Exception e) {}synchronized (thread) {// 喚醒正在阻塞的線程thread.notify();}}

}

多線程通訊實現生產者與消費者

public class Thread04 {
class Res {
/**
* 姓名
/
private String userName;
/*
* 性別
/
private char sex;
/*
* 標記
*/
private boolean flag = false;
}

class InputThread extends Thread {private Res res;public InputThread(Res res) {this.res = res;}@Overridepublic void run() {int count = 0;while (true) {synchronized (res) {//flag = false 寫入輸入 flag = true 則不能寫入數據 只能讀取數據try {// 如果flag = true 則不能寫入數據 只能讀取數據 同時釋放鎖!if (res.flag) {res.wait();}} catch (Exception e) {}if (count == 0) {this.res.userName = "余勝軍";this.res.sex = '男';} else {this.res.userName = "小薇";this.res.sex = '女';}res.flag = true;res.notify();}count = (count + 1) % 2;}} }class OutThread extends Thread {private Res res;public OutThread(Res res) {this.res = res;}@Overridepublic void run() {while (true) {synchronized (res) {try {if (!res.flag) {res.wait();}} catch (Exception e) {}System.out.println(res.userName + "," + res.sex);res.flag = false;res.notify();}}} }public static void main(String[] args) {new Thread04().print(); }public void print() {Res res = new Res();InputThread inputThread = new InputThread(res);OutThread outThread = new OutThread(res);inputThread.start();outThread.start(); }

}

/**

• flag 默認值==false
• flag false 輸入線程 輸入值 輸出線程 先拿到鎖 釋放鎖
• flag true 輸出線程 輸出值
  */
  public boolean flag = false;

Join/Wait與sleep之間的區別
sleep(long)方法在睡眠時不釋放對象鎖
join(long)方法先執行另外的一個線程，在等待的過程中釋放對象鎖 底層是基于wait封裝的，
Wait(long)方法在等待的過程中釋放對象鎖
三個線程 T1，T2，T3，怎么確保它們按順序執行？
Thread t1 = new Thread(() -> System.out.println(Thread.currentThread().getName() + “,線程執行”), “t1”);
Thread t2 = new Thread(() -> System.out.println(Thread.currentThread().getName() + “,線程執行”), “t2”);
Thread t3 = new Thread(() -> System.out.println(Thread.currentThread().getName() + “,線程執行”), “t3”);
t1.start();
t2.start();
t3.start();

public class Thread05 {

public static void main(String[] args) throws InterruptedException {Thread t1 = new Thread(() -> {try {Thread.sleep(3000);} catch (Exception e) {}System.out.println(Thread.currentThread().getName() + ",線程執行");}, "t1");Thread t2 = new Thread(() -> {try {t1.join();} catch (InterruptedException e) {}System.out.println(Thread.currentThread().getName() + ",線程執行");}, "t2");Thread t3 = new Thread(() -> {try {t2.join();} catch (InterruptedException e) {}System.out.println(Thread.currentThread().getName() + ",線程執行");}, "t3");t1.start();t2.start();t3.start(); }

}

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