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Java - Test Questions on 'Commvault' - 11 questions found

Which of the following Java feature promotes access protection or Hiding ?

Reference

Core Java

Inheritance

Encapsulation

Abstraction

Composition

_{java java concepts java features oops concepts oops features access protection information hiding}

Which of the following is true ?

Core Java

Composition is Tightly Bound

Inheritance is Tightly Bound

Object can only hold reference of only one other object

A Class cannot be extended by multiple classes

What is the relationship between Vehicle and Engine in this example ?

public class Vehicle {
   Enginer engine;
   public void move(){
      engine = new Engine();
      engine.start();
   }
}

Core Java

Composition ( Vehicle has a Engine )

Composition ( Engine has a Vehicle )

Inheritance ( Vehicle is a Engine )

Inheritance ( Engine is a Vehicle )

_{composition inheritance oops concepts}

What is the relationship between Car and Vehicle in the following code ?

public class Car extends Vehicle{
   Engine engine;

   public static void main(String[] args){
      Vehicle vehicle = new Car();
      car.move();
   }

   public void move(){
      engine = new Engine();
      engine.start();
   }
}

Core Java

Composition ( Vehicle has a Car )

Composition ( Car has a Vehicle )

Inheritance ( Vehicle is a Car )

Inheritance ( Car is a Vehicle )

_{Inheritance Composition Oops concepts}

What is the problem with the following code ?

public class Car extends Vehicle{
   Vehicle vehicle;

   Car(){
      super();
      this.vehicle = new Vehicle();
   }
}

Core Java

There is an Inheritance as well as Composition relationship between Vehicle and Car which is not permitted

We cannot initialize the parent class instance within the constructor

Call to super is illegal

There is no problem

_{Composition Inheritance OOPS concepts}

Which memory segment holds String Pool ?

Core Java

Stack

Heap

Code Segment

Class Segment

_{memory management string pool}

In this code

public class BuggyBread1{
   private static String staticVariable = "static Variable";

   private String instanceVariable = "instance Variable";

   public static void main (String args[]) {
String localVariable = "local Variable";
}
}

Where will the value 'static Variable' be stored ?

Core Java

Stack Memory Segment

Heap Memory Segment

Runtime Constant Pool within Heap Segment

Code Segment

_{memory manegement}

In this code

public class BuggyBread1{
   private static String staticVariable = "static Variable";

   private String instanceVariable = "instance Variable";

   public static void main (String args[]) {
String localVariable = "local Variable";
}
}

Where will the value 'static Variable' be stored ?

Core Java

Stack Memory Segment

Heap Memory Segment

Runtime Constant Pool within Heap Segment

Code Segment

_{memory management}

In this code

public class BuggyBread1{
   private static String staticVariable = "static Variable";

   private String instanceVariable = "instance Variable";

   public static void main (String args[]) {
String localVariable = new String("local Variable");
}
}

Where will the value 'local Variable' be stored ?

Core Java

Stack Memory Segment

Heap Memory Segment

Runtime Constant Pool within Heap Segment

Code Segment

_{memory management}

In this code

public class BuggyBread1{
   private static String staticVariable = new String("static Variable");

   private String instanceVariable = "instance Variable";

   public static void main (String args[]) {
String localVariable = "local Variable";
}
}

Where will the value 'static Variable' be stored ?

Core Java

Stack Memory Segment

Heap Memory Segment

Runtime Constant Pool within Heap Segment

Code Segment

_{memory management}

Which of following memory segment is cleaned by Garbage Collection Mechanism ?

Core Java

Stack

Heap

Code

Cache

_{memory management garbage collection}

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