Java Interview Guide : 200+ Interview Questions and Answers - Java Popularity and Platform Independence

The video tutorial explores why Java is a popular programming language, highlighting its platform independence and object-oriented nature. Java's platform independence is achieved through the use of bytecode and the Java Virtual Machine (JVM), which allows Java programs to run on any operating system. The JVM converts bytecode into executable instructions specific to each operating system, ensuring Java's 'build once, run anywhere' capability.

What is one of the main reasons for Java's popularity?

• It is a low-level programming language.

• It is platform independent.

• It is only used for web development.

• It is the oldest programming language.

What does platform independence mean in the context of Java?

• Java programs can be written once and run on any operating system.

• Java programs can only run on Windows.

• Java programs require specific hardware to run.

• Java programs are only compatible with Unix systems.

How does Java achieve platform independence?

• By using a universal operating system.

• By compiling directly to machine code.

• Through the use of the Java Virtual Machine and bytecode.

• By using a single executable format for all systems.

What is the role of the Java Virtual Machine (JVM)?

• To compile Java code into machine code.

• To convert bytecode into executable instructions for specific operating systems.

• To manage memory allocation for Java programs.

• To translate Java code into Python.

What is bytecode in Java?

• A type of machine code.

• A scripting language.

• A database query language.

• An intermediate representation of Java code.

How do different JVMs handle bytecode?

• They store it as a backup.

• They convert it into executable instructions specific to their operating system.

• They compile it into a single universal format.

• They ignore it and run native code.

What is common among JVMs across different operating systems?

• They all use the same machine code.

• They all understand Java bytecode.

• They all run on Windows.

• They all require the same hardware.