java多线程的使用

public class LiftOff implements Runnable {
    protected int countDown = 10;
    private static int taskCount = 0;
    private final int id = taskCount++;

    public LiftOff() {
        System.out.println("LiftOff Start:"+Thread.currentThread().getId());
    }

    public LiftOff(int countDown) {
        this.countDown = countDown;
    }

    public String status() {
        System.out.println("LiftOff tid:"+Thread.currentThread().getId());
        return "#" + id + "(" + (countDown > 0 ? countDown : "Liftoff!") + "),";
    }

    public void run() {
        
        while (countDown-- > 0) {
//            System.out.print();
            status();
            //Thread.yield();
        }
        System.out.println("LiftOff End:"+Thread.currentThread().getId());
    }

}

public class BasicThreads {
    
    public static void main(String[] args){
        System.out.println("main tid:"+Thread.currentThread().getId());
        Thread t=new Thread(new LiftOff());
        t.start();
        System.out.println("Waiting for LiftOff");
    }
}

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;


public class CachedThreadPool {

    public static void main(String[] args) {
        ExecutorService exec=Executors.newCachedThreadPool();
        for (int i = 0; i < 10; i++) {
            exec.execute(new LiftOff());
        }
        exec.shutdown();
    }
}

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;


public class FixedThreadPool {
    public static void main(String[] args) {
        ExecutorService exec=Executors.newFixedThreadPool(5);
        for (int i = 0; i < 10; i++) {
            exec.execute(new LiftOff());
        }
        exec.shutdown();
    }
}

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

public class SingleThreadExecutor {
    public static void main(String[] args) {
        ExecutorService exec = Executors.newSingleThreadExecutor();
        for (int i = 0; i < 5; i++) {
            exec.execute(new LiftOff());
        }
        exec.shutdown();
    }
}