Core Java Interview Questions with Answers (2024)

• What is Bytecode in Java?
• What is a JIT compiler?
• What is Bytecode in Java?
• Bubble Sort Program in Java
• Coding Guidelines in Java
• What are Identifiers in Java?
• What is a class in Java?
• The Concept of Null in Java
• What is Package in Java?
• Public Modifiers in Java
• Unicode System in Java
• Java Coding Standards
• Difference between Java Servlet and CGI
• What are the different types of Java Tools & Java Networking
• Servlet JSP Interview Questions for Java
• Advantages of Exception Handling in Java
• Can we have try block without catch block?
• What are Thread Local Variables?
• Features of the inner member classes in Java
• What is a collection in Java?
• What is Inheritance?
• What are Thread Groups Java?
• Explain the importance of finally block in java?
• Explain Features of Interfaces in Java
• Different types of wrapper classes in Java
• What is Thread in Java?
• What are checked Exceptions in Java?
• What are unchecked exceptions in java?
• What is Vector Java?
• Difference between Process and Thread?
• Differences between checked and Unchecked exceptions in Java
• What is default Exception handling in Java?
• Explain Throw keyword in Java
• What are user Defined Exceptions in Java?
• How many Classes can be placed in one file in Java?
• Difference between overriding and overloading in Java?
• Differentiate Between Character and String Constant Java
• The different types of Java libraries & Java frameworks
• What are the type of Classes and Interfaces in Java?
• What are the different types of Java control statements?
• What happens if the main method is not declared static in Java?
• Features of JavaScript
• What are the different components of the Java platform?
• What are the benefits of using Java?
• Can the main method be declared private or protected in Java?
• Why is the main method static in Java?
• Is the void return type mandatory for the main method in Java?
• Why is Java case-sensitive?
• What are static blocks and static initializers in Java?
• Difference between Abstract Class and Interface in Java?
• What is Method Overloading in Java?
• Why Java is Platform Independent?
• What are Access Modifiers in Java?
• Difference between this() and super() in Java?
• What is method overriding in Java?
• What is a super keyword in Java?
• Difference between method overloading and method overriding in Java?