java多线程的3种写法

1.Thread

/**
 *
 */
package testJava2.thread;

/**
 * @author xxx.sjtu
 * @function
 * @date 2017年5月17日
 * @version
 */
public class FirstThreadTest extends Thread {
    int i = 0;

    public FirstThreadTest(int i) {
        super();
        this.i = i;
    }

    public FirstThreadTest() {
        super();
        // TODO Auto-generated constructor stub
    }

    public FirstThreadTest(Runnable target, String name) {
        super(target, name);
        // TODO Auto-generated constructor stub
    }

    public FirstThreadTest(Runnable target) {
        super(target);
        // TODO Auto-generated constructor stub
    }

    public FirstThreadTest(String name) {
        super(name);
        // TODO Auto-generated constructor stub
    }

    public FirstThreadTest(ThreadGroup group, Runnable target, String name,
            long stackSize) {
        super(group, target, name, stackSize);
        // TODO Auto-generated constructor stub
    }

    public FirstThreadTest(ThreadGroup group, Runnable target, String name) {
        super(group, target, name);
        // TODO Auto-generated constructor stub
    }

    public FirstThreadTest(ThreadGroup group, Runnable target) {
        super(group, target);
        // TODO Auto-generated constructor stub
    }

    public FirstThreadTest(ThreadGroup group, String name) {
        super(group, name);
        // TODO Auto-generated constructor stub
    }

    // 重写run方法，run方法的方法体就是现场执行体
    public void run() {
        //当前线程: this
        System.out.println(this.getName() + "  " + i);
    }

    public static void main(String[] args) {
        System.out.println(Thread.currentThread().getName());
        new FirstThreadTest(888).start();
    }
}

2.Runnable

/**
 *
 */
package testJava2.thread;

/**
 * @author xxx.sjtu
 * @function
 * @date 2017年5月17日
 * @version
 */
public class RunnableThreadTest implements Runnable {

    private int i;

    public RunnableThreadTest() {
        super();
        // TODO Auto-generated constructor stub
    }

    public RunnableThreadTest(int i) {
        super();
        this.i = i;
    }

    @Override
    public void run() {
        //当前线程: Thread.currentThread()
        System.out.println(Thread.currentThread().getName() + " " + i);
    }

    public static void main(String[] args) {
        System.out.println(Thread.currentThread().getName());
        RunnableThreadTest rtt = new RunnableThreadTest(999);
        new Thread(rtt, "新线程1").start();
    }
}

3.Callable

/**
 *
 */
package testJava2.thread;

import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.FutureTask;

/**
 * @author xxx.sjtu
 * @function
 * @date 2017年5月17日
 * @version
 */
public class CallableThreadTest implements Callable<Integer> {

    @Override
    public Integer call() throws Exception {
        int i = 2017;
        System.out.println(Thread.currentThread().getName() + " " + i);
        return i;
    }

    public static void main(String[] args) {
        CallableThreadTest ctt = new CallableThreadTest();
        FutureTask<Integer> ft = new FutureTask<>(ctt);
        new Thread(ft, "有返回值的线程").start();
        try {
            System.out.println("子线程的返回值：" + ft.get());
        } catch (InterruptedException e) {
            e.printStackTrace();
        } catch (ExecutionException e) {
            e.printStackTrace();
        }

    }

}