Monday, 13 July 2015

Java Programs[Important]

  1. WRITE A JAVA PROGRAM that correctly implements Producer-Consumer problem using the concept of Inter Thread Communication.
  2.  
  3. Program :
  4.  
  5. class Q 
  6. { 
  7. int n; 
  8. boolean valueSet = false;
  9.  
  10. synchronized int get() 
  11. {
  12.  if (!valueSet) 
  13. try 
  14. { 
  15. wait();
  16.  } 
  17. catch (InterruptedException e)
  18.  {
  19.  }
  20.  
  21. System.out.println(“Got: “ + n);
  22.  valueSet = false;
  23.  notify();
  24.  return n;
  25.  }
  26.  
  27. synchronized void put(int n) 
  28. { 
  29. if (valueSet)
  30.  try 
  31. {
  32.  wait();
  33.  } 
  34. catch (InterruptedException e)
  35.  { 
  36. }
  37.  
  38. this.n = n;
  39.  valueSet = true;
  40.  System.out.println(“Put: “ + n);
  41.  notify();
  42.  }
  43.  }
  44.  
  45. class Producer implements Runnable {
  46.  Q q;
  47.  
  48. Producer(Q q) 
  49. { 
  50. this.q = q;
  51.  new Thread(this, “Producer”).start(); 
  52. }
  53. public void run() { int i = 0;
  54.  
  55. while(true) { q.put(i++); 
  56. }
  57.  }
  58.  }
  59.  
  60. class Consumer implements Runnable {
  61.  Q q;
  62.  
  63. Consumer(Q q)
  64.  {
  65.  this.q = q; 
  66. new Thread(this, “Consumer”).start(); 
  67. }
  68.  
  69. public void run() 
  70. { 
  71. while(true) 
  72. { 
  73. q.get(); 
  74. } 
  75. }   

  77. }
  78.  
  79. class PC 
  80. {
  81.  public static void main (String args[ ])
  82.  { 
  83. Q q = new Q();
  84.  new Producer(q);
  85.  new Consumer(q);
  86.  
  87. System.out.println(“Press Ctrl-C to stop”);
  88.  } 
  89. }