java--线程认识与实例记录 NO.1

下面的内容都是从java编程思想一书中摘取出来，我认为很有产考价值，并且便于后续使用。

主要内容是记录继承thread和实现runnable接口两种方式的代码用法，及内部类中启用线程的用法。

1、首先看下一个继承Thread类的用法，通过第13行代码，在构造方法中通过start开启线程。

然后程序执行SimpleThread类的run方法。

package concurrency;//: concurrency/SimpleThread.java// Inheriting directly from the Thread class.public class SimpleThread extends Thread {private int countDown = 5;private static int threadCount = 0;public SimpleThread() {// Store the thread name:super(Integer.toString(++threadCount));start();}public String toString() {return "#" + getName() + "(" + countDown + "), ";}public void run() {while (true) {System.out.print(this);if (--countDown == 0)return;}}public static void main(String[] args) {for (int i = 0; i < 5; i++)new SimpleThread();}} 

2、下面是一个实现Runnable接口的实例方法：

通过对比两个程序的用法上大致相同，区别在于实现接口的类可以再继承其他的类。

package concurrency;//: concurrency/SelfManaged.java// A Runnable containing its own driver Thread.public class SelfManaged implements Runnable {private int countDown = 5;private Thread t = new Thread(this);public SelfManaged() {t.start();}public String toString() {return Thread.currentThread().getName() + "(" + countDown + "), ";}public void run() {while (true) {System.out.print(this);if (--countDown == 0)return;}}public static void main(String[] args) {for (int i = 0; i < 5; i++)new SelfManaged();}}

3、基于继承thread和实现runnable接口的内部类，实现方式：

package concurrency;//: concurrency/ThreadVariations.java// Creating threads with inner classes.import java.util.concurrent.*;import static net.mindview.util.Print.*;// Using a named inner class:class InnerThread1 {private int countDown = 5;private Inner inner;private class Inner extends Thread {Inner(String name) {super(name);start();}public void run() {try {while (true) {print(this);if (--countDown == 0)return;sleep(10);}} catch (InterruptedException e) {print("interrupted");}}public String toString() {return getName() + ": " + countDown;}}public InnerThread1(String name) {inner = new Inner(name);}}// Using an anonymous inner class:class InnerThread2 {private int countDown = 5;private Thread t;public InnerThread2(String name) {t = new Thread(name) {public void run() {try {while (true) {print(this);if (--countDown == 0)return;sleep(10);}} catch (InterruptedException e) {print("sleep() interrupted");}}public String toString() {return getName() + ": " + countDown;}};t.start();}}// Using a named Runnable implementation:class InnerRunnable1 {private int countDown = 5;private Inner inner;private class Inner implements Runnable {Thread t;Inner(String name) {t = new Thread(this, name);t.start();}public void run() {try {while (true) {print(this);if (--countDown == 0)return;TimeUnit.MILLISECONDS.sleep(10);}} catch (InterruptedException e) {print("sleep() interrupted");}}public String toString() {return t.getName() + ": " + countDown;}}public InnerRunnable1(String name) {inner = new Inner(name);}}// Using an anonymous Runnable implementation:class InnerRunnable2 {private int countDown = 5;private Thread t;public InnerRunnable2(String name) {t = new Thread(new Runnable() {public void run() {try {while (true) {print(this);if (--countDown == 0)return;TimeUnit.MILLISECONDS.sleep(10);}} catch (InterruptedException e) {print("sleep() interrupted");}}public String toString() {return Thread.currentThread().getName() + ": " + countDown;}}, name);t.start();}}// A separate method to run some code as a task:class ThreadMethod {private int countDown = 5;private Thread t;private String name;public ThreadMethod(String name) {this.name = name;}public void runTask() {if (t == null) {t = new Thread(name) {public void run() {try {while (true) {print(this);if (--countDown == 0)return;sleep(10);}} catch (InterruptedException e) {print("sleep() interrupted");}}public String toString() {return getName() + ": " + countDown;}};t.start();}}}public class ThreadVariations {public static void main(String[] args) {new InnerThread1("InnerThread1");new InnerThread2("InnerThread2");new InnerRunnable1("InnerRunnable1");new InnerRunnable2("InnerRunnable2");new ThreadMethod("ThreadMethod").runTask();}} /* (Execute to see output) */// :~

截图说明：