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Java : Perform single task by multiple threads

Tutorial by:Arena Buocel      Date: 2016-05-04 05:26:11

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If you have to perform single task by many threads, have only one run() method.For example:

Program of performing single task by multiple threads

 
  1. class TestMultitasking1 extends Thread{  
  2.  public void run(){  
  3.    System.out.println("task one");  
  4.  }  
  5.  public static void main(String args[]){  
  6.   TestMultitasking1 t1=new TestMultitasking1();  
  7.   TestMultitasking1 t2=new TestMultitasking1();  
  8.   TestMultitasking1 t3=new TestMultitasking1();  
  9.   
  10.   t1.start();  
  11.   t2.start();  
  12.   t3.start();  
  13.  }  
  14. }  

Test it Now

Output:task one
       task one
       task one

Program of performing single task by multiple threads

 
  1. class TestMultitasking2 implements Runnable{  
  2. public void run(){  
  3. System.out.println("task one");  
  4. }  
  5.   
  6. public static void main(String args[]){  
  7. Thread t1 =new Thread(new TestMultitasking2());//passing annonymous object of TestMultitasking2 class  
  8. Thread t2 =new Thread(new TestMultitasking2());  
  9.   
  10. t1.start();  
  11. t2.start();  
  12.   
  13.  }  
  14. }  

 

Output:task one
       task one

Note: Each thread run in a separate callstack.

MultipleThreadsStack


How to perform multiple tasks by multiple threads (multitasking in multithreading)?

If you have to perform multiple tasks by multiple threads,have multiple run() methods.For example:

Program of performing two tasks by two threads

 
  1. class Simple1 extends Thread{  
  2.  public void run(){  
  3.    System.out.println("task one");  
  4.  }  
  5. }  
  6.   
  7. class Simple2 extends Thread{  
  8.  public void run(){  
  9.    System.out.println("task two");  
  10.  }  
  11. }  
  12.   
  13.  class TestMultitasking3{  
  14.  public static void main(String args[]){  
  15.   Simple1 t1=new Simple1();  
  16.   Simple2 t2=new Simple2();  
  17.   
  18.   t1.start();  
  19.   t2.start();  
  20.  }  
  21. }  

 

Output:task one
       task two

Same example as above by annonymous class that extends Thread class:

Program of performing two tasks by two threads

 
  1. class TestMultitasking4{  
  2.  public static void main(String args[]){  
  3.   Thread t1=new Thread(){  
  4.     public void run(){  
  5.       System.out.println("task one");  
  6.     }  
  7.   };  
  8.   Thread t2=new Thread(){  
  9.     public void run(){  
  10.       System.out.println("task two");  
  11.     }  
  12.   };  
  13.   
  14.   
  15.   t1.start();  
  16.   t2.start();  
  17.  }  
  18. }  

 

Output:task one
       task two

Same example as above by annonymous class that implements Runnable interface:

Program of performing two tasks by two threads

 
  1. class TestMultitasking5{  
  2.  public static void main(String args[]){  
  3.   Runnable r1=new Runnable(){  
  4.     public void run(){  
  5.       System.out.println("task one");  
  6.     }  
  7.   };  
  8.   
  9.   Runnable r2=new Runnable(){  
  10.     public void run(){  
  11.       System.out.println("task two");  
  12.     }  
  13.   };  
  14.       
  15.   Thread t1=new Thread(r1);  
  16.   Thread t2=new Thread(r2);  
  17.   
  18.   t1.start();  
  19.   t2.start();  
  20.  }  
  21. }  

 

Output:task one
       task two

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