public class MyThread implements Runnable{ArrayListaaa;public MyThread(ArrayListaaa){this.aaa=aaa;}@Overridepublic void run() {for (int i=0;i<100;i++){aaa.add("aaa"+i);System.out.println(Thread.currentThread().getName()+"aaa"+i+aaa.get(i));}}
}
写一个测试方法
public class ListDemo {public static void main(String[] args) {ArrayListlist=new ArrayList<>();MyThread m1=new MyThread(list);MyThread m2=new MyThread(list);new Thread(m1).start();new Thread(m2).start();}
}-----结果------
Thread-0aaa0aaa0
Thread-1aaa0aaa0
Thread-0aaa1aaa0
Thread-1aaa1aaa0
Thread-0aaa2aaa1
Thread-1aaa2aaa1
Thread-0aaa3aaa1
Thread-1aaa3aaa1
Thread-0aaa4aaa2
Thread-1aaa4aaa2
Thread-0aaa5aaa2
Thread-1aaa5aaa2
Thread-1aaa6aaa3
Thread-1aaa7aaa3
Thread-0aaa6aaa3
Thread-1aaa8aaa4
Thread-1aaa9aaa4
Thread-0aaa7aaa3
Thread-1aaa10aaa5
Thread-0aaa8aaa4
Thread-1aaa11aaa5
Thread-0aaa9aaa4
Thread-1aaa12aaa6
Thread-1aaa13aaa6
Thread-0aaa10aaa5
Thread-1aaa14aaa7
Thread-0aaa11aaa5
Thread-1aaa15aaa8
Thread-0aaa12aaa6
Thread-1aaa16aaa7
Thread-0aaa13aaa6
Thread-1aaa17aaa9
Thread-0aaa14aaa7
Thread-1aaa18aaa10
Thread-0aaa15aaa8
Thread-1aaa19aaa8
Thread-0aaa16aaa7
Thread-0aaa17aaa9
Thread-0aaa18aaa10
Thread-0aaa19aaa8Process finished with exit code 0
public class MyThread extends Thread{ArrayListaaa;public MyThread(ArrayListaaa){this.aaa=aaa;}@Overridepublic void run() {for (int i=0;i<20;i++){aaa.add("aaa"+i);System.out.println(Thread.currentThread().getName()+"aaa"+i+aaa.get(i));}}
}------结果------
Thread-0aaa0null
Thread-1aaa0null
Thread-0aaa1aaa0
Thread-1aaa1aaa0
Thread-0aaa2aaa1
Thread-1aaa2aaa1
Thread-0aaa3aaa1
Thread-1aaa3aaa1
Thread-0aaa4aaa2
Thread-1aaa4aaa2
Thread-0aaa5aaa2
Thread-1aaa5aaa2
Thread-0aaa6aaa3
Thread-1aaa6aaa3
Thread-0aaa7aaa3
Thread-1aaa7aaa3
Thread-0aaa8aaa4
Thread-1aaa8aaa4
Thread-0aaa9aaa4
Thread-0aaa10aaa5
Thread-1aaa9aaa4
Thread-0aaa11aaa5
Thread-1aaa10aaa5
Thread-0aaa12aaa6
Thread-0aaa13aaa6
Thread-0aaa14aaa7
Thread-1aaa11aaa5
Thread-0aaa15aaa7
Thread-1aaa12aaa6
Thread-0aaa16aaa8
Thread-1aaa13aaa6
Thread-0aaa17aaa8
Thread-1aaa14aaa7
Thread-0aaa18aaa9
Thread-1aaa15aaa7
Thread-0aaa19aaa10
Thread-1aaa16aaa8
Thread-1aaa17aaa8
Thread-1aaa18aaa9
Thread-1aaa19aaa10Process finished with exit code 0
public class CallerTask implements Callable {public String call() throws Exception {return "Hello,i am running!";}public static void main(String[] args) {//创建异步任务FutureTask task=new FutureTask(new CallerTask());//启动线程new Thread(task).start();try {//等待执行完成,并获取返回结果String result=task.get();System.out.println(result);} catch (InterruptedException e) {e.printStackTrace();} catch (ExecutionException e) {e.printStackTrace();}}
}
-----结果-----
Hello,i am running!
run():封装线程执行的代码,直接调用相当于调用普通方法。
start():启动线程,然后由JVM 调用此线程的 run() 方法。
实现Runable接口好,原因有两个:
①、避免了Java单继承的局限性
②、适合多个相同的程序代码去处理同一资源的情况,把线程、代码和数据有效的分离,更符合面向对象的设计思想。
try {//sleep会发生异常要显示处理Thread.sleep(20);//暂停20毫秒
} catch (InterruptedException e) {e.printStackTrace();
}
ArrayListlist=new ArrayList<>();MyThread m1=new MyThread(list);MyThread m2=new MyThread(list);m1.start();try {m1.join();} catch (InterruptedException e) {e.printStackTrace();}m2.start();
结果:等待m1执行完才会轮到m2
Thread-0aaa0aaa0
Thread-0aaa1aaa1
Thread-0aaa2aaa2
Thread-0aaa3aaa3
Thread-0aaa4aaa4
Thread-0aaa5aaa5
Thread-0aaa6aaa6
Thread-0aaa7aaa7
Thread-0aaa8aaa8
Thread-0aaa9aaa9
Thread-0aaa10aaa10
Thread-0aaa11aaa11
Thread-0aaa12aaa12
Thread-0aaa13aaa13
Thread-0aaa14aaa14
Thread-0aaa15aaa15
Thread-0aaa16aaa16
Thread-0aaa17aaa17
Thread-0aaa18aaa18
Thread-0aaa19aaa19
Thread-1aaa0aaa0
Thread-1aaa1aaa1
Thread-1aaa2aaa2
Thread-1aaa3aaa3
Thread-1aaa4aaa4
Thread-1aaa5aaa5
Thread-1aaa6aaa6
Thread-1aaa7aaa7
Thread-1aaa8aaa8
Thread-1aaa9aaa9
Thread-1aaa10aaa10
Thread-1aaa11aaa11
Thread-1aaa12aaa12
Thread-1aaa13aaa13
Thread-1aaa14aaa14
Thread-1aaa15aaa15
Thread-1aaa16aaa16
Thread-1aaa17aaa17
Thread-1aaa18aaa18
Thread-1aaa19aaa19
附一张线程的生命周期