TCS iON Java Developer Interview Questions, Process, and Tips

Primitive data types are basic data types provided by Java, such as int, double, boolean, char, etc.

• Primitive data types are predefined by the language and not objects

• They are used to store simple values directly in memory

• They have a fixed size and do not have any methods

• Examples include int for integers, double for floating-point numbers, boolean for true/false values, char for characters

JVM stands for Java Virtual Machine. It is a virtual machine that executes Java bytecode.

• JVM is responsible for running Java programs by interpreting bytecode.

• It provides platform independence by executing bytecode on different operating systems.

• JVM manages memory, performs garbage collection, and optimizes code execution.

• It consists of various components like class loader, bytecode verifier, interpreter, and just-in-t...read more

Java is object-oriented to promote code reusability, modularity, and maintainability.

• Java's object-oriented approach allows for the creation of reusable code components called objects.

• Objects encapsulate data and behavior, making it easier to manage and maintain code.

• Inheritance enables the creation of hierarchies and promotes code reuse.

• Polymorphism allows objects of different classes to be treated as objects of a com...read more

JIT stands for Just-In-Time compiler. It is a part of the Java Virtual Machine (JVM) that compiles bytecode into machine code at runtime.

• JIT is responsible for improving the performance of Java applications by compiling frequently executed code into native machine code.

• It analyzes the code at runtime and identifies the hotspots, i.e., the code that is executed frequently.

• JIT compiles the hotspots into machine code and ...read more

Just-in-time (JIT) is a feature in Java that compiles bytecode into native machine code at runtime.

• JIT improves the performance of Java programs by reducing the time needed for compilation.

• JIT is enabled by default in most Java virtual machines.

• JIT can be disabled using the -Xint option.

• JIT can also be configured using various options such as -XX:CompileThreshold and -XX:MaxInlineLevel.