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  1. //Implement Runnable Interface...
  2.  class ImplementsRunnable implements Runnable {
  3.  
  4. private int counter = 0;
  5.  
  6. public void run() {
  7.     counter++;
  8.     System.out.println("ImplementsRunnable : Counter : " + counter);
  9.  }
  10. }
  11.  
  12. //Extend Thread class...
  13. class ExtendsThread extends Thread {
  14.  
  15. private int counter = 0;
  16.  
  17. public void run() {
  18.     counter++;
  19.     System.out.println("ExtendsThread : Counter : " + counter);
  20.  }
  21. }
  22.  
  23. //Use the above classes here in main to understand the differences more clearly...
  24. class ThreadVsRunnable {
  25.  
  26. public static void main(String args[]) throws Exception {
  27.     // Multiple threads share the same object.
  28.     ImplementsRunnable rc = new ImplementsRunnable();
  29.     Thread t1 = new Thread(rc);
  30.     t1.start();
  31.     Thread.sleep(1000); // Waiting for 1 second before starting next thread
  32.     Thread t2 = new Thread(rc);
  33.     t2.start();
  34.     Thread.sleep(1000); // Waiting for 1 second before starting next thread
  35.     Thread t3 = new Thread(rc);
  36.     t3.start();
  37.  
  38.     // Creating new instance for every thread access.
  39.     ExtendsThread tc1 = new ExtendsThread();
  40.     Thread t11 = new Thread(tc1);
  41.     t11.start();
  42.     Thread.sleep(1000); // Waiting for 1 second before starting next thread
  43.     Thread t21 = new Thread(tc1);
  44.     t21.start();
  45.     Thread.sleep(1000); // Waiting for 1 second before starting next thread
  46.     Thread t31 = new Thread(tc1);
  47.     t31.start();
  48.  }
  49. }
Success #stdin #stdout 0.09s 34008KB
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ImplementsRunnable : Counter : 1
ImplementsRunnable : Counter : 2
ImplementsRunnable : Counter : 3
ExtendsThread : Counter : 1
ExtendsThread : Counter : 2
ExtendsThread : Counter : 3
https://ideone.com/Tcy0Ua
language:
Java (HotSpot 12)
created:
4 years ago
visibility:
public

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