Core Java - Interview Questions and Answers for 'Thread class' | Search Interview Question

Core Java - Interview Questions and Answers for 'Thread class' - 4 question(s) found - Order By Newest

Q1. Why do we need Thread class even in case we execute thread using runnable interface ?

Ans. Thread class holds the definition of start method ( This is the method that starts execution of new thread and then calls run method within the scope of new thread ). Interfaces don't hold any definition and so does runnable. So it makes it necessary the usage of Thread class , whatever implementation you choose.

When your class extends the thread class, it carries the definition of start method from parent Thread class onto itself and hence new yourClass.start() helps starting a new thread and then executing run method in that new thread scope.

When you implement runnable interface , you are just making it sure to the JVM that you have implemented the required method ( run() ) which the Thread start method will look for upon executing start method.

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Q2. Name few classes that extend Thread class ?

Core Java

Ans. http://www.buggybread.com/2015/02/java-threads-classes-that-inherit.html

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Q3. Why do we use Thread Class as well as Runnable Interface for creating threads in Java ?

Core Java

^{This question is still unanswered. Can you please provide an answer.}

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Q4. Write a Program to show Java thread usage by extending Thread class

Ans. public class MyClass {
   static class MyThreadClass extends Thread{

      @Override
      public void run() {
         System.out.println("Hello");
         try {
            Thread.sleep(1000);
            System.out.println("Hello Again");
         } catch (InterruptedException e) {
            e.printStackTrace();
         }

      }

   }

   public static void main(String[] args){
      MyThreadClass myThreadClass = new MyThreadClass();
      myThreadClass.start();

      MyThreadClass myThreadClass2 = new MyThreadClass();
      myThreadClass2.start();
   }
}

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