Java -Assessment Milestone -1

What is the primary difference between JDK and JRE?

• JDK is for development, JRE is for running Java programs

• JRE includes JVM, JDK does not

• JDK is platform-independent, JRE is not

• JRE is for development, JDK is for running Java programs

Which of the following is true about encapsulation in Java?

• It allows direct access to class variables

• It hides the internal state of an object and provides access through methods

• It prevents inheritance

• It is used to achieve polymorphism

What will be the output of the following code? java public class Test { public static void main(String[] args) { String s = "Java"; s.concat(" Programming"); System.out.println(s); } }

• Java Programming

• Java

• Null

• Compilation Error

Which keyword is used to prevent a method from being overridden?

• static

• final

• abstract

• synchronized

What happens if a try block does not have a catch block?

• Compilation error

• Runtime error

• The program executes normally if no exception occurs

• The program always terminates

What is the primary purpose of encapsulation in Java?

• To allow direct access to class variables

• To hide the internal state of an object and provide controlled access

• To enable multiple inheritance

• To prevent method overriding

Which keyword is used to inherit a class in Java?

• implements

• extends

• super

• this

What will be the output of the following code? java class Parent { void display() { System.out.println("Parent class"); } } class Child extends Parent { void display() { System.out.println("Child class"); } } public class Test { public static void main(String[] args) { Parent p = new Child(); p.display(); } }

• Parent class

• Child class

• Compilation error

• Runtime error

Which of the following is true about a final class in Java?

• It can be extended

• It cannot be instantiated

• It cannot be extended

• It must be abstract

What is the role of the super keyword in a constructor?

• To create a new object

• To call the superclass's constructor

• To access private fields directly

• To prevent inheritance