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) */// :~

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