Xangars Solutions Java Developer Interview Questions and Answers

The default value of an int in Java is 0.

• In Java, when an int variable is declared but not initialized, it is automatically assigned the default value of 0.

• For example, int num; // num is assigned the default value of 0.

Yes, the default value of an int in Java is 0.

• In Java, when an int variable is declared but not initialized, it will have a default value of 0.

• For example, int num; will have a default value of 0.

• This default value is assigned by the Java Virtual Machine (JVM) when memory is allocated for the variable.

The static keyword in Java is used to create class-level variables and methods that can be accessed without creating an instance of the class.

• Static variables are shared among all instances of a class.

• Static methods can be called without creating an instance of the class.

• Static blocks are used to initialize static variables.

• Static keyword can also be used to create static nested classes.

The volatile keyword in Java is used to indicate that a variable's value will be modified by different threads.

• Ensures visibility of changes made by one thread to other threads

• Prevents compiler optimizations that could reorder instructions

• Useful for variables accessed by multiple threads without synchronization

• Example: volatile boolean flag = true;

Java API stands for Java Application Programming Interface, which provides a set of pre-written code for common tasks in Java programming.

• Java API includes classes, interfaces, packages, and methods that developers can use to interact with the Java programming language.

• It simplifies the development process by providing ready-to-use components for tasks like file handling, networking, database connectivity, and more.

• Exa...read more

Java stands for Just Another Virtual Machine

• Java stands for Just Another Virtual Machine

• It is a high-level programming language developed by Sun Microsystems

• Java code is compiled into bytecode that runs on any Java Virtual Machine (JVM)

Java is a high-level, object-oriented programming language known for its portability and versatility.

• Java is platform-independent, meaning it can run on any device with a Java Virtual Machine (JVM)

• It is object-oriented, allowing for modular and reusable code

• Java is known for its robust standard library, which includes tools for networking, data structures, and more