測(cè)試代碼：

public static Object loc=new Object(); public static void main(String[] args) throws Exception{ Thread t1=new Thread(new Runnable() { @Override public void run() {try { java.text.SimpleDateFormat sdf=new SimpleDateFormat('HH:mm:ss SSS'); System.out.println('['+sdf.format(new Date())+'] t1___等待鎖...'); synchronized (loc) { System.out.println('['+sdf.format(new Date())+'] t1___獲得鎖 ...'); Thread.sleep(5000); System.out.println('['+sdf.format(new Date())+'] t1___loc..開始執(zhí)行wait...'); loc.wait(); System.out.println('['+sdf.format(new Date())+'] t1___loc..執(zhí)行wait后續(xù)...'); Thread.sleep(1000); } System.out.println('['+sdf.format(new Date())+'] t1___loc..離開鎖...');}catch (Exception e){ e.printStackTrace();} } }); Thread t3=new Thread(new Runnable() { @Override public void run() {try { java.text.SimpleDateFormat sdf=new SimpleDateFormat('HH:mm:ss SSS'); System.out.println('['+sdf.format(new Date())+'] t3___等待鎖...'); synchronized (loc) { System.out.println('['+sdf.format(new Date())+'] t3___進(jìn)入鎖...'); Thread.sleep(5000); System.out.println('['+sdf.format(new Date())+'] t3___loc..開始 wait...'); loc.wait(); System.out.println('['+sdf.format(new Date())+'] t3___loc..執(zhí)行 wait后續(xù)...'); Thread.sleep(1000); } System.out.println('['+sdf.format(new Date())+'] t3___離開鎖...');}catch (Exception e){ e.printStackTrace();} } }); Thread t2=new Thread(new Runnable() { @Override public void run() {try { java.text.SimpleDateFormat sdf=new SimpleDateFormat('HH:mm:ss SSS'); System.out.println('['+sdf.format(new Date())+'] t2___等待鎖...'); synchronized (loc) { System.out.println('['+sdf.format(new Date())+'] t2___獲得鎖...'); Thread.sleep(5000); System.out.println('['+sdf.format(new Date())+'] t2___loc..開始執(zhí)行 notify...'); loc.notify(); System.out.println('['+sdf.format(new Date())+'] t2___loc..執(zhí)行 notify后續(xù)...'); Thread.sleep(1000); } System.out.println('['+sdf.format(new Date())+'] t2___loc 離開鎖....');}catch (Exception e){ e.printStackTrace();} } }); t1.start(); t3.start(); Thread.sleep(500); t2.start(); System.out.println('t1___before join ....'); t1.join(); System.out.println('t2___before join ....'); t2.join(); System.out.println('t3____before join ....'); t3.join(); System.out.println('main exit....'); }

執(zhí)行結(jié)果:

[16:55:59 384] t1___等待鎖...

[16:55:59 384] t1___獲得鎖 ...

[16:55:59 384] t3___等待鎖...t1___before join ....[16:55:59 836] t2___等待鎖...[16:56:04 392] t1___loc..開始執(zhí)行wait...

[16:56:04 392] t2___獲得鎖...[16:56:09 392] t2___loc..開始執(zhí)行 notify...[16:56:09 392] t2___loc..執(zhí)行 notify后續(xù)...[16:56:10 392] t2___loc 離開鎖....

[16:56:10 392] t3___進(jìn)入鎖...[16:56:15 392] t3___loc..開始 wait...[16:56:15 392] t1___loc..執(zhí)行wait后續(xù)...[16:56:16 392] t1___loc..離開鎖...t2___before join ....t3____before join ....

總結(jié)：

1. 執(zhí)行wait后‘’暫時(shí)‘ 釋放當(dāng)前對(duì)象鎖給其他線程，當(dāng)前線程處于等待狀態(tài)

2. syn塊中的wait收到notify通知后 喚醒cpu 繼續(xù)判斷鎖狀態(tài)

3. 執(zhí)行notify且當(dāng)前的對(duì)象鎖釋放后 wait等待的線程激活

4. notifyAll 是一次喚醒所有的wait

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