testrunnable.java

此源码为机械工业出版社出版的《Java语言程序设计》第三版所配套的书中所有源代码。

// TestRunnable.java: Define threads using the Runnable interface
public class TestRunnable
{
  // Main method
  public static void main(String[] args)
  { 
    // 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=1; 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;
  }

  public void run()
  {
    for (int i=1; i <= lastNum; i++)
      System.out.print(" " + i);
  }
}