Top Core Java Interview Questions || Core Java Interview Questions and Answers [MOST ASKED]

In Top Core Java Interview Questions and Answers video you will get top 10 tricky core interview question asked in an interview. Also this video is for both Freshers and Experienced canditates.

This video covers Top Java interview Questions And Answers asked in MNCs from both Freshers and Laterals,

Which May include some Questions of java interview questions and Answers like :
Q) Why Java is not 100% Object-oriented?
Java is not 100% object-oriented because it includes primitive data types, supports static members and procedural programming, lacks multiple inheritance for classes, and has access modifiers. These features deviate from the strict principles of pure object-oriented programming.

Q) Why pointers are not used in Java? Mostly asked in java interview questions and Answers in MNC to check you basic knowledge of java and programming languages and logics behind them.

Because :
1) They are unsafe.
2) Increases the complexity of the program and since Java is known for its simplicity of code, adding the concept of pointers will be contradicting.
3) Since JVM is responsible for implicit memory allocation, thus in order to avoid direct access to memory by the user, pointers are discouraged in Java

Q) What is JIT compiler in Java?
The JIT (Just-In-Time) Compiler in Java converts bytecode into native machine code during runtime, improving performance by optimizing frequently executed code paths. It adapts to runtime behavior, enhancing execution speed and ensuring platform independence. Compiled code is cached for efficiency, benefiting Java applications across different platforms.

Q) Why String is immutable in java?
Security: Since strings are widely used as parameters for many Java classes (e.g., network connections, file handling), their immutability ensures that sensitive information, once assigned to a string, cannot be changed. This helps in creating secure systems.
Synchronization: Immutable strings simplify concurrent programming. Multiple threads can access and share strings without the need for synchronization mechanisms, reducing the chances of errors and improving performance.

Q) What is a marker interface?
A Marker interface can be defined as the interface having no data member and member functions. In simpler terms, an empty inetrface is called the Marker interface.

Example: Serializable interface marks classes as serializable for object persistence. A class implementing it signals its ability to be converted into bytes for storage or transmission without specifying any methods.

Q) Can you override a private or static method in Java?
No, we cannot override a private or static method in Java using the regular method overriding mechanism.
Private Methods: Private methods are not visible to subclasses, so they cannot be overridden in a subclass. They are specific to the class in which they are defined.
Static Methods: Static methods belong to the class itself and are associated with the class, not with instances of the class. They are resolved at compile-time, not runtime, so they are not overridden in the traditional sense. Subclasses can declare their own static methods with the same signature, but this is called method hiding, not method overriding.

Q) Does “finally” always execute in Java?
Not in following cases
“System.exit()” function
system crash

Q) What Methods Does the Object Class Have?
The Object class in Java is the root class for all other classes, and it provides several methods that are inherited by all classes in Java. Here are some of the important methods provided by the Object class:

Q) How Can You Make a Class Immutable?

Q) What is singleton class in Java and how can we make a class singleton?

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