package chapter15;

/**
 * Title:        Chapter 15, "Multithreading"
 * Description:  Examples for Chapter 15
 * Copyright:    Copyright (c) 2000
 * Company:      Armstrong Atlantic State University
 * @author Y. Daniel Liang
 * @version 1.0
 */

// TestRunnable.java: Define threads using the Runnable interface
public class TestRunnable
{
  /**Main method*/
  public static void main(String[] args)
  {
    new TestRunnable();
  }

  /**Default constructor*/
  public TestRunnable()
  {
    // Create threads
    Thread printA = new Thread(new PrintChar('a', 100));
    Thread printB = new Thread(new PrintChar('b', 100));
    Thread print100 = new Thread(new PrintNum(100));

    // Start threads
    print100.start();
    printA.start();
    printB.start();
  }

  // The thread class for printing a specified character
  // in specified times
  class PrintChar implements Runnable
  {
    private char charToPrint;  // The character to print
    private int times;  // The times to repeat

    /**Construct a thread with specified character and number of
       times to print the character
     */
    public PrintChar(char c, int t)
    {
      charToPrint = c;
      times = t;
    }

    /**Override the run() method to tell the system
       what the thread will do
     */
    public void run()
    {
      for (int i=0; i<=times; i++)
        System.out.print(charToPrint);
    }
  }

  // The thread class for printing number from 1 to n for a given n
  class PrintNum implements Runnable
  {
    private int lastNum;

    /**Construct a thread for print 1, 2, ... i*/
    public PrintNum(int n)
    {
      lastNum = n;
    }

    /**Tell the thread how to run*/
    public void run()
    {
      for (int i=1; i <= lastNum; i++)
        System.out.print(" " + i);
    }
  }
}