java 多线程基础

package com.vince.xq.kafka.thread;
public class ThreadOne implements Runnable {
    private int i;
    public ThreadOne(int i) {
        this.i=i;
    }
    @Override
    public void run() {
        try {
            Thread.sleep(1000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        System.out.println(i);
    }
}

package com.vince.xq.kafka;
import com.vince.xq.kafka.thread.ThreadOne;
public class TestThread {
    public static void main(String[] args) {
        for (int i = 0; i < 5; i++) {
            Thread thread = new Thread(new ThreadOne(i));
            thread.start();
        }
    }
}

package com.vince.xq.kafka.thread;
public class ThreadTwo extends Thread {
    private int i;
    public ThreadTwo(int i){
        this.i=i;
    }
    @Override
    public void run() {
        System.out.println(i);
    }
}

package com.vince.xq.kafka;
import com.vince.xq.kafka.thread.ThreadTwo;
public class TestThread {
    public static void main(String[] args) {
        for (int i = 0; i < 5; i++) {
            Thread thread = new ThreadTwo(i);
            thread.start();
        }
    }
}

package com.vince.xq.kafka.thread;
import java.util.concurrent.Callable;
public class ThreadThree implements Callable<String> {
    @Override
    public String call() {
        try {
            int x = 10 / 1;
            return "test";
        } catch (Exception e) {
            e.printStackTrace();
            return "0";
        }
    }
}

package com.vince.xq.kafka;
import com.vince.xq.kafka.thread.ThreadThree;
import java.util.concurrent.*;
public class TestThread {
    public static void main(String[] args) throws ExecutionException, InterruptedException {
        ThreadPoolExecutor threadPoolExecutor = new ThreadPoolExecutor(1, 1,
                0L, TimeUnit.MILLISECONDS,
                new LinkedBlockingQueue<Runnable>());
        FutureTask<String> futureTask = new FutureTask<>(new ThreadThree());
        threadPoolExecutor.submit(futureTask);
        System.out.println(futureTask.get());//主线程等子线程结束
        threadPoolExecutor.shutdown();
    }
}

        ThreadPoolExecutor threadPoolExecutor = new ThreadPoolExecutor(1, 1,
                0L, TimeUnit.MILLISECONDS,
                new LinkedBlockingQueue<Runnable>());
        FutureTask<String> futureTask = new FutureTask<>(new ThreadThree());
        threadPoolExecutor.submit(futureTask);
        System.out.println(futureTask.get());//主线程等子线程结束
        threadPoolExecutor.shutdown();

package com.vince.xq.kafka;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.ThreadFactory;
public class TestThread {
    public static void main(String[] args) throws InterruptedException {
        long startTime = System.currentTimeMillis();
        CountDownLatch countDownLatch = new CountDownLatch(2);
        ExecutorService executorService = Executors.newFixedThreadPool(3);
        executorService.execute(()-> {
            try {
                test1(countDownLatch);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        });
        executorService.execute(()-> {
            try {
                test2(countDownLatch);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        });
        executorService.shutdown();
        countDownLatch.await();
        System.out.println("0000");
        System.out.println("costTime:");
        System.out.println(System.currentTimeMillis() - startTime);
    }
    public static void test1(CountDownLatch countDownLatch) throws InterruptedException {
        Thread.sleep(2000);
        System.out.println(111);
        countDownLatch.countDown();
        //return "111";
    }
    public static void test2(CountDownLatch countDownLatch) throws InterruptedException {
        Thread.sleep(2000);
        System.out.println(222);
        countDownLatch.countDown();
    }
    public static String test3() throws InterruptedException {
        Thread.sleep(2000);
        return "333";
    }
}
class MyUncaughtExceptionHandle implements Thread.UncaughtExceptionHandler {
    @Override
    public void uncaughtException(Thread t, Throwable e) {
        System.out.println("caught " + e);
    }
}
class HandleThreadFactory implements ThreadFactory {
    @Override
    public Thread newThread(Runnable r) {
        System.out.println("create thread t");
        Thread t = new Thread(r);
        System.out.println("set uncaughtException for t");
        t.setUncaughtExceptionHandler(new MyUncaughtExceptionHandle());
        return t;
    }
}

long startTime = System.currentTimeMillis();
Thread thread = new Thread(new ThreadOne("1"));
thread.start();
//thread.join();
long costTime = System.currentTimeMillis() - startTime;
System.out.println("costTime:" + costTime);
package com.vince.xq.kafka.thread;
import java.util.concurrent.atomic.AtomicBoolean;
public class ThreadOne implements Runnable {
    private static AtomicBoolean exists = new AtomicBoolean(false);
    private String name;
    public ThreadOne(String i) {
        this.name = i;
    }
    @Override
    public void run() {
        if (exists.compareAndSet(false, true)) {
            System.out.println(name + "start");
            try {
                Thread.sleep(6000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            exists.set(false);
            System.out.println("111111");
        } else {
            System.out.println(name + " give up");
        }
    }
}