Quiz on Java Features

Which is used to access the class and methods in Java?

 Which features make JAVA a more secure one?

Which classes are used to inherit the classes in java ?

The Java compiler converts the program into bytecode and sends it to the JVM. Until it sends, the bytecode is saved with what extension file?

 Which helps to link the program with native C and C++ library files  after loading?

What are the things that are deleted in this program by garbage collection?

class Example

{

   public static void main(String arg[])

   {

       System.out.println(“Welcome To DataFlair”);

       String s = “Hello”;

       System.out.println(“Hello”);

       Integer a =  new Integer(123);    

   }

}

Which concept in java  is used when we want to clean the application and are used in the background?

To avoid thread polling in JAVA what concept should be introduced?

Rather than Extending a thread class what is another way to create a thread ?

What will be the output of the program?

 public class Demo implements Runnable

      {

         public static void main(String args [] )

          {

             Thread Firstname = new Thread(“Data”);

Thread Lastname = new Thread(“Flair”);

Firstname.start();

Lastname.start();

System.out.println(“The full name is”);

System,out.println(Firstname.getname()+ Lastname.getname());

}

@Override

public void run()

{

}

}

The given program is an example of which Java concept?\

 public class Demo implements Runnable

      {

         public static void main(String args [] )

          {

             Thread Firstname = new Thread(“Data”);

Thread Lastname = new Thread(“Flair”);

Firstname.start();

Lastname.start();

System.out.println(“The full name is”);

System,out.println(Firstname.getname());

 System.out.println(Lastname.getname()) ;

}

@Override

public void run()

{

}

}

Object code produced for a non existing CPU but run with the help of JVM in another CPU is an example of which type of portability?

 Java Source code compiled in any program can be executed in any other system. Justify?

Which concept makes the system secure and executes the program in the sandbox?

Which of the following are the ways to write a JAVA Program?