j_thread.java.bak

一个十分好的java基础学习的课件

// ////////////////////////////////////////////////////////
// 
// J_Thread.java
// 
// Created by Jun-Hai Yong,    on XX xx, xxxx (Date)
// ////////////////////////////////////////////////////////
// Readme:
//      Demonstrating the Thread class.
// ////////////////////////////////////////////////////////
// Using this example, please explicitly refer to the book:
//     Jun-Hai Yong. Programming in Java. 
//     Beijing: Tsinghua University Press, 2004.
// 使用本例子，请注明引用:
//     雍俊海. Java 程序设计. 北京: 清华大学出版社, 2004.
// Please note that the author and publisher make no 
// warranty of any kind on the examples provided.
// ////////////////////////////////////////////////////////

public class J_Thread extends Thread
{
    private int m_sleepTime;

    public J_Thread(String name, int t)
    {
        super(name);
        m_sleepTime=t;
    } // End of method: J_Thread
    
    public void loop( )
    {
        for(int i=0; i<1000; i++)
        {
            double d= Math.sin(i);
            int j= (int)d+i;
            i= j-(int)d;
        }
    } // End of method: loop

    public void run( )
    {
        System.out.println(getName( ) + " begins running.");
        int k= 2;
        for(int i=0; i<k; i++)
        {
            System.out.println(getName( ) + " : " + i + " with priority " + getPriority( ));
            for(int j=0; j<1000; j++)
                loop( );
        } // End of outer for loop
        try
        {
            sleep(m_sleepTime*1000);
        }
        catch(InterruptedException e)
        {
        }
        for(int i=k; i<k+k; i++)
        {
            System.out.println(getName( ) + " : " + i + " with priority " + getPriority( ));
            for(int j=0; j<1000; j++)
                loop( );
        } // End of outer for loop
        System.out.println(getName( ) + " stops running.");
    } // End of method: run
    
    public static void main( String args[] )
    { 
        J_Thread frank = new J_Thread("Frank", 1);
        J_Thread mary = new J_Thread("Mary", 2);
        J_Thread alice = new J_Thread("alice", 2);
        J_Thread chris = new J_Thread("Chris", 1);
        frank.setPriority(Thread.MIN_PRIORITY);
        mary.setPriority(Thread.NORM_PRIORITY);
        alice.setPriority(Thread.NORM_PRIORITY);
        chris.setPriority(Thread.MAX_PRIORITY);
        frank.start( );
        mary.start( );
        alice.start( );
        chris.start( );
    } // End of method: main

}  // End of class: J_Thread