Thread类的一些被Thread对象调用的方法:
1 public void start()
使该线程开始执行;Java 虚拟机调用该线程的 run 方法。2 public void run()
如果该线程是使用独立的 Runnable 运行对象构造的,则调用该 Runnable 对象的 run 方法;否则,该方法不执行任何操作并返回。3 public final void setName(String name)
改变线程名称,使之与参数 name 相同。4 public final void setPriority(int priority)
更改线程的优先级。5 public final void setDaemon(boolean on)
将该线程标记为守护线程或用户线程。6 public final void join(long millisec)
等待该线程终止的时间最长为 millis 毫秒。7 public void interrupt()
中断线程。8 public final boolean isAlive()
测试线程是否处于活动状态。
Thread类的一些静态方法:
1 public static void yield()
暂停当前正在执行的线程对象,并执行其他线程。2 public static void sleep(long millisec)
在指定的毫秒数内让当前正在执行的线程休眠(暂停执行),此操作受到系统计时器和调度程序精度和准确性的影响。3 public static boolean holdsLock(Object x)
当且仅当当前线程在指定的对象上保持监视器锁时,才返回 true。4 public static Thread currentThread()
返回对当前正在执行的线程对象的引用。5 public static void dumpStack()
将当前线程的堆栈跟踪打印至标准错误流。
实例
如下的ThreadClassDemo 程序演示了Thread类的一些方法:
// 文件名 : DisplayMessage.java
// 通过实现 Runnable 接口创建线程
public class DisplayMessage implements Runnable
{
private String message;
public DisplayMessage(String message)
{
this.message = message;
}
public void run()
{
while(true)
{
System.out.println(message);
}
}
}
// 文件名 : GuessANumber.java
// 通过继承 Thread 类创建线程
public class GuessANumber extends Thread
{
private int number;
public GuessANumber(int number)
{
this.number = number;
}
public void run()
{
int counter = 0;
int guess = 0;
do
{
guess = (int) (Math.random() * 100 + 1);
System.out.println(this.getName()
+ " guesses " + guess);
counter++;
}while(guess != number);
System.out.println("** Correct! " + this.getName()
+ " in " + counter + " guesses.**");
}
}
// 文件名 : ThreadClassDemo.java
public class ThreadClassDemo
{
public static void main(String [] args)
{
Runnable hello = new DisplayMessage("Hello");
Thread thread1 = new Thread(hello);
thread1.setDaemon(true);
thread1.setName("hello");
System.out.println("Starting hello thread...");
thread1.start();
Runnable bye = new DisplayMessage("Goodbye");
Thread thread2 = new Thread(bye);
thread2.setPriority(Thread.MIN_PRIORITY);
thread2.setDaemon(true);
System.out.println("Starting goodbye thread...");
thread2.start();
System.out.println("Starting thread3...");
Thread thread3 = new GuessANumber(27);
thread3.start();
try
{
thread3.join();
}catch(InterruptedException e)
{
System.out.println("Thread interrupted.");
}
System.out.println("Starting thread4...");
Thread thread4 = new GuessANumber(75);
thread4.start();
System.out.println("main() is ending...");
}
}
运行结果如下,每一次运行的结果都不一样。
Starting hello thread...
Starting goodbye thread...
Hello
Hello
Hello
Hello
Hello
Hello
Hello
Hello
Hello
Thread-2 guesses 27
Hello
** Correct! Thread-2 in 102 guesses.**
Hello
Starting thread4...
Hello
Hello
..........remaining result produced.
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