1  public class TaskThreadDemo {
  2    public static void main(String[] args) {
  3      // Create tasks
  4      Runnable printA = new PrintChar('a', 100);
  5      Runnable printB = new PrintChar('b', 100);
  6      Runnable print100 = new PrintNum(100);
  7  
  8      // Create threads
  9      Thread thread1 = new Thread(printA);
 10      Thread thread2 = new Thread(printB);
 11      Thread thread3 = new Thread(print100);
 12  
 13      // Start threads
 14      thread1.start();
 15      thread2.start();
 16      thread3.start();
 17    }
 18  }
 19  
 20  // The task for printing a specified character in specified times
 21  class PrintChar implements Runnable {
 22    private char charToPrint; // The character to print
 23    private int times; // The times to repeat
 24  
 25    /** Construct a task with specified character and number of
 26     *  times to print the character
 27     */
 28    public PrintChar(char c, int t) {
 29      charToPrint = c;
 30      times = t;
 31    }
 32  
 33    @Override /** Override the run() method to tell the system
 34     *  what the task to perform
 35     */
 36    public void run() {
 37      for (int i = 0; i < times; i++) {
 38        System.out.print(charToPrint);
 39      }
 40    }
 41  }
 42  
 43  // The task class for printing number from 1 to n for a given n
 44  class PrintNum implements Runnable {
 45    private int lastNum;
 46  
 47    /** Construct a task for printing 1, 2, ... i */
 48    public PrintNum(int n) {
 49      lastNum = n;
 50    }
 51  
 52    @Override /** Tell the thread how to run */
 53    public void run() {
 54      for (int i = 1; i <= lastNum; i++) {
 55        System.out.print(" " + i);
 56      }
 57    }
 58  }