线程的让步
线程让出自己占用的CPU资源
- 线程让出资源，不指定让给谁
- 线程让出资源，指定让给谁
方法1：
public static void yield();
线程实现交替打印
import java.io.*;import java.util.*;class MyRunnable implements Runnable{ private String l; private String r; public MyRunnable(String fl,String fr) { this.l=fl;this.r=fr; } public void run() { for(int i=0;i<30;i++) { System.out.print(l+" "+i+" "+r+" "); Thread.yield(); } }}public class Main { public static void main(String[] args) { MyRunnable mr1=new MyRunnable("[","]"); MyRunnable mr2=new MyRunnable("(",")"); Thread t1=new Thread(mr1); Thread t2=new Thread(mr2); t1.start();t2.start(); }} 方法2：
public final void join() throws InterruptedException public final void join(long millis) throws InterruptedException public final void join(long millis,int nano) throws InterruptedException
将两个线程合并为同一个线程，A调用join B，A等到B结束再恢复执行
import java.io.*;import java.util.*;class MyRunnable implements Runnable{ private String l; private String r; public MyRunnable(String fl,String fr) { this.l=fl;this.r=fr; } public void run() { for(int i=0;i<30;i++) { System.out.print(l+" "+i+" "+r+" "); Thread.yield(); } }}public class Main { public static void main(String[] args) { MyRunnable mr1=new MyRunnable("[","]"); Thread t1=new Thread(mr1); t1.start(); for(int i=0;i<30;i++) { if(i==10) { try { System.out.print("Join"); t1.join(); }catch(InterruptedException e) { e.printStackTrace(); } } System.out.print("( "+i+" )"); } }} 方法3：
public final void setDaemon(boolean on) //将某个线程设置为守护线程
方法4：
public static void sleep(long millis)throws InterruptedExcepiton
线程同步
方法1：
synchronized 加锁
class Resources{ synchronized void function1(Thread currThread) { for(int i=0;i<300;i++) { System.out.println(currThread.getName()); } }}class MyThread extends Thread{ Resources rs; public MyThread(String tname,Resources trs) { this.setName(tname); this.rs=trs; } public void run() { if(this.getName().equals("Thread1")) { System.out.println("Thread1启动，等待进入function1"); rs.function1(this); }else { System.out.println("Thread2启动，等待进入function1"); rs.function1(this); } }}public class Main { public static void main(String[] args) { Resources rs=new Resources(); MyThread t1=new MyThread("Thread1",rs); MyThread t2=new MyThread("Thread2",rs); t1.start();t2.start(); }｝ 方法2：
public final void wait() throws InterruptedExceptionpublic final void wait(long timeout) throws InterruptedExceptionpublic final void notify()public final void notifyAll()