core java frequently asked questions and answers 2023

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sure! below is a tutorial that covers some frequently asked questions about core java, along with explanations and code examples. this should be helpful for anyone preparing for java interviews or wanting to strengthen their java knowledge.

core java frequently asked questions (faqs)

1. what is java?
java is a high-level, object-oriented programming language developed by sun microsystems (now owned by oracle) that is designed to have as few implementation dependencies as possible. it is widely used for building enterprise-scale applications, mobile applications (android), web applications, and more.

2. what are the main features of java?
**object-oriented**: java is based on the concept of objects, which can contain data and methods.
**platform-independent**: java code is compiled into bytecode, which can run on any java virtual machine (jvm).
**automatic memory management (garbage collection)**: java has built-in garbage collection to manage memory automatically.
**multithreaded**: java supports multithreading, allowing concurrent execution of two or more threads.
**robust and secure**: java has strong memory management and security features.

3. what is the difference between jdk, jre, and jvm?
**jdk (java development kit)**: a software development kit that provides tools to develop java applications, including the compiler (javac), jre, and other tools.
**jre (java runtime environment)**: provides the libraries and jvm necessary to run java applications. it does not include development tools.
**jvm (java virtual machine)**: an abstract machine that enables a computer to run java programs by converting bytecode into machine language.

4. what are the access modifiers in java?
access modifiers determine the visibility of classes, methods, and variables. the four main access modifiers are:
**public**: accessible from any other class.
**private**: accessible only within the same class.
**protected**: accessible within the same package an ...

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