Java创建线程及配合使用Lambda方式

public class FirstThreadTest extends Thread {
    int i = 0;
    // 重写run方法，run方法的方法体就是现场执行体
    public void run() {
        for (; i < 5; i++) {
            System.out.println(getName() + "  " + i);
        }
    }
    public static void main(String[] args) {
        for (int i = 0; i < 3; i++) {
            System.out.println(Thread.currentThread().getName() + "  : " + i);
            if (i == 2) {
                new FirstThreadTest().start();
                new FirstThreadTest().start();
            }
        }
    }
}

public class RunnableThreadTest implements Runnable {
    private int i;
    public void run() {
        for (i = 0; i < 5; i++) {
            System.out.println(Thread.currentThread().getName() + " " + i);
        }
    }
    public static void main(String[] args) {
        for (int i = 0; i < 3; i++) {
            System.out.println(Thread.currentThread().getName() + " " + i);
            if (i == 2) {
                RunnableThreadTest rtt = new RunnableThreadTest();
                new Thread(rtt, "新线程1").start();
                new Thread(rtt, "新线程2").start();
            }
        }
    }
}

public class RunnableThreadTest {
    // 目的是为了代码的重用【静态方法】
    public static void threadRunCode_Static() {
        for (int i = 0; i < 5; i++) {
            System.out.println(Thread.currentThread().getName() + " " + i);
        }
    }
    // 目的是为了代码的重用【非静态方法】
    public void threadRunCode() {
        for (int i = 0; i < 5; i++) {
            System.out.println(Thread.currentThread().getName() + " " + i);
        }
    }
    @Test
    public void testStatic() {
        // 重用静态方法中的代码【使用方法引用】
        for (int i = 0; i < 3; i++) {
            System.out.println(Thread.currentThread().getName() + " " + i);
            if (i == 2) {
                new Thread(RunnableThreadTest::threadRunCode_Static, "线程1").start();
                ;
                new Thread(RunnableThreadTest::threadRunCode_Static, "线程2").start();
                ;
            }
        }
    }
    @Test
    public void testNoStatic() {
        // 重用非静态方法中的代码【使用方法引用】
        RunnableThreadTest temp = new RunnableThreadTest();
        for (int i = 0; i < 3; i++) {
            System.out.println(Thread.currentThread().getName() + " " + i);
            if (i == 2) {
                new Thread(temp::threadRunCode, "线程1").start();
                new Thread(temp::threadRunCode, "线程2").start();
            }
        }
    }
    @Test
    public void testLambda() {
        // 重用静态方法中的代码【使用方法引用】
        for (int i = 0; i < 3; i++) {
            System.out.println(Thread.currentThread().getName() + " " + i);
            if (i == 2) {
                new Thread(() -> {
                    for (int b = 0; b < 5; b++) {
                        System.out.println(Thread.currentThread().getName() + " " + b);
                    }
                },"线程1").start();
                new Thread(() -> {
                    for (int b = 0; b < 5; b++) {
                        System.out.println(Thread.currentThread().getName() + " " + b);
                    }
                },"线程2").start();
            }
        }
    }
}

public interface Callable{
　　V call() throws Exception;
}

public class CallableThreadTest implements Callable<Integer> {
    @Override
    public Integer call() throws Exception {
        int i = 0;
        for (; i < 5; i++) {
            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);
        for (int i = 0; i < 3; i++) {
            System.out.println(Thread.currentThread().getName() + " 的循环变量i的值" + i);
            if (i == 2) {
                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 | ExecutionException e) {
            e.printStackTrace();
        }
    }
}

public class CallableThreadTest {
    public static void main(String[] args) {
        FutureTask<Integer> ft = new FutureTask<>(() -> {
            int i = 0;
            for (; i < 5; i++) {
                System.out.println(Thread.currentThread().getName() + " " + i);
            }
            return i;
        });
        for (int i = 0; i < 3; i++) {
            System.out.println(Thread.currentThread().getName() + " 的循环变量i的值" + i);
            if (i == 2) {
                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 | ExecutionException e) {
            e.printStackTrace();
        }
    }
}