Metafic Test Engineer Interview Questions and Answers

String constant pool is a memory area in Java where unique string literals are stored to optimize memory usage.

• String constant pool is a part of the Java heap memory.

• It stores unique string literals to avoid duplicate storage.

• Strings created using double quotes are stored in the string constant pool.

• Strings created using new keyword are stored in the heap memory.

Yes, we can create object for abstract classes and interfaces in Java.

• Objects cannot be created for abstract classes directly, but can be created for concrete subclasses that extend the abstract class.

• Interfaces cannot be instantiated, but objects can be created for classes that implement the interface.

• Example: Abstract class Animal { abstract void makeSound(); } Class Dog extends Animal { void makeSound() { System.out...read more

The keyword used in interface for concrete method is 'default'.

• The 'default' keyword is used in interfaces to provide a default implementation for a method.

• It allows interfaces to have concrete methods without requiring implementing classes to override them.

• Example: 'default void methodName() { // method implementation }'