Java之线程编程的4种方法实现案例讲解

时间:2021-09-20 06:30:34

1、继承Thread

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public class T4 {
    public static void main(String[] args) {
        System.out.println(Thread.currentThread());
        Thread t1 = new A1();
        t1.start();
    }
}
class A1 extends Thread{
    @Override
    public void run() {
        for(int i=0;i<10;i++) {
            System.out.println("Thread:"+Thread.currentThread().getName());
        }
    }
}

2、实现Runnable接口

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public class T3 {
    public static void main(String[] args) {
        System.out.println("Thread:"+Thread.currentThread().getName());
        Thread t1 = new Thread(new A2());
        t1.start();
    }
 
}
class A2 implements Runnable{
    @Override
    public void run() {
        int res =0;
        for(int i=0;i<10;i++) {
            res+=i;
        System.out.println("Thread:"+Thread.currentThread().getName());
        }
    }
}

3、使用Callable和Future接口创建线程

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import java.util.concurrent.Callable;
import java.util.concurrent.FutureTask;
 
public class T2 {
    public static void main(String[] args) throws Exception {
        System.out.println("Test3:" + Thread.currentThread().getName());
        Callable c = new A4();
        FutureTask ft = new FutureTask(c);
        Thread t1 = new Thread(ft);
        t1.start();
        Object res = ft.get();
        System.out.println("结果:" + res);
    }
}
class A4 implements Callable {
    @Override
    public Object call() throws Exception {
        int res = 0;
        for (int i = 0; i < 10; i++) {
            res += i;
            System.out.println("Thread:" + Thread.currentThread().getName());
        }
        return res;
    }
}

4、使用线程池创建线程

享元模式
享元模式Flyweight Pattern主要用于减少创建对象的数量,以减少内存占用和提高性能。这种类型的设计模式属于 结构型模式,它提供了减少对象数量从而改善应用所需的对象结构的方式
优点:大大减少对象的创建,降低系统内存的使用,以提高程序的执行效率。
缺点:提高了系统的复杂度,需要分离出外部状态和内部状态,而且外部状态具有固有化的性质,不应该随着内部 状态的变化而变化,否则会造成系统的混乱。

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import java.util.concurrent.Callable;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
 
public class T1 {
    public static void main(String[] args) throws Exception {
        Future[] arr = new Future[5];
        ExecutorService es = Executors.newFixedThreadPool(3);
        for (int i = 0; i < 5; i++) {
            arr[i] = es.submit(new A4());
        }
        for (Future f : arr) {
            Object res = f.get();
            System.out.println("结果为:" + res);
        }
        es.shutdown();
    }
}
 
class A4 implements Callable {
    @Override
    public Object call() throws Exception {
        int res = 0;
        for (int i = 0; i < 10; i++) {
            res += i;
            System.out.println("Thread" + Thread.currentThread().getName());
        }
        return res;
    }
}

 

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原文链接:https://blog.csdn.net/qq_45874107/article/details/113754912