Observe.AI Software Testing Engineer Interview Questions and Answers

Q1. What is string contant pool?
Ans. 
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.
Answered by AI
Add your answer
Q2. Can we create object for abstract classes and interfaces?
Ans. 
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
Answered by AI
Add your answer
Q3. What is the keyword used in interface if we want concreate method?
Ans. 
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 }'
Answered by AI
Add your answer

Q1. Method overloading
Add your answer
Q2. Constructor uses and types
Ans. 
Constructors are special methods used to initialize objects in a class. They can be parameterized or default.
• Constructors have the same name as the class they belong to

• They are called automatically when an object is created

• Parameterized constructors accept arguments to initialize object properties

• Default constructors have no parameters and provide default values

• Constructors can be overloaded by having multiple construc
Answered by AI
Add your answer

Star pattern program and logical program

Q1. Related to all documents
Add your answer
Q2. Salary discussion
Add your answer