Thread

1. What is Thread?
1.a. Thread is a Light-weight ,its allow multiple activities within a single process.
1.b. All treads of a process share the common memory space, The process of execution multiple threads simultaneously is known as multi-threading.

2. Non-Thread Program vs Thread Program

2.a. Example Non-Thread Program.

public class WithoutThread {

// main method
public static void main(String[] args) {
  // TODO Auto-generated method stub
  String str = “banana”;
  String str2 = “papaya”;

  ProcessClass proStr = new ProcessClass();
  proStr.IterateRandomValue(str);
  proStr.IterateRandomValue(str2);
}
}
class ProcessClass{
public void IterateRandomValue(String itr){
  for (int i = 0; i < 5; i++) {
    System.out.println(i + ” ” + itr );
  }
   }
}

OUTPUT in Console:
0 banana
1 banana
2 banana
3 banana
4 banana
0 papaya
1 papaya
2 papaya
3 papaya
4 papaya

Descriptions on without Thread class : without added thread class, it will execute the process one by one ( check the output program above, program banana will run first until its finish, and then, papaya program will be run ) – sequentially. the Process will taking longer time to finish the processing compare than extends Thread class or implements Runnable class.

2.b. Thread Program.

the Functions of Java Threads is to allow multiple activities within a single process.
To implement The Threads function we need to extends Thread Class or Implements Interface Runnable Class.

Example Program extend Thread class.

public class ThreadExample {
//Main Thread
    public static void main(String[] args)
    {
    // TODO Auto-generated method stub
    String str = “banana”;
    String str2 = “papaya”;

     // First Thread
    ExtendThread firstThread = new ExtendThread(str);
    firstThread.start();

        //Second Tread
    ExtendThread secondThread = new ExtendThread(str2);
    secondThread.start();
    }

}

class ExtendThread extends Thread
{
private String strNew;

ExtendThread(String str) {
  strNew = new String(str);
}

@Override
public void run() {
  for (int i = 0; i < 5; i++) {
   System.out.println(i + ” ” + strNew);
  }

}
}

Output:
Starting Banana
Creating ..Papaya
Starting Papaya
Running..Banana
Thread : Banana,4
Running..Papaya
Thread : Papaya,4
Thread : Banana,3
Thread : Papaya,3
Thread : Banana,2
Thread : Papaya,2
Thread : Banana,1
Thread : Papaya,1

If we see the results for (papaya,1) and (Banana, 1) its actually run simultaneously

Category: Thread

Thread in Java.