Which principle represents Java portability?

Which principle represents Java portability?

• A. Write Once, Run Anywhere
• B. Compile Once, Execute Everywhere
• C. Java is platform-specific
• D. Run Anywhere, Compile Anywhere

Answer: (A)

The idea being tested is Java’s portability, achieved through the Java Virtual Machine and bytecode. When you compile Java source, it becomes bytecode that can run on any platform that has a compatible JVM. The JVM abstracts away differences in operating systems and hardware, so the same program can run on Windows, macOS, Linux, and more without recompiling. This is why the statement “Write Once, Run Anywhere” best captures Java portability. The other options don’t fit because they misstate how Java is executed. “Compile once, execute everywhere” suggests a single compilation yields universal native code or runtime compatibility in all environments, which isn’t how Java works. “Java is platform-specific” directly contradicts portability. “Run Anywhere, Compile Anywhere” isn’t a recognized principle and doesn’t describe the actual机制 of using a JVM to run bytecode across platforms.

The idea being tested is Java’s portability, achieved through the Java Virtual Machine and bytecode. When you compile Java source, it becomes bytecode that can run on any platform that has a compatible JVM. The JVM abstracts away differences in operating systems and hardware, so the same program can run on Windows, macOS, Linux, and more without recompiling. This is why the statement “Write Once, Run Anywhere” best captures Java portability.

The other options don’t fit because they misstate how Java is executed. “Compile once, execute everywhere” suggests a single compilation yields universal native code or runtime compatibility in all environments, which isn’t how Java works. “Java is platform-specific” directly contradicts portability. “Run Anywhere, Compile Anywhere” isn’t a recognized principle and doesn’t describe the actual机制 of using a JVM to run bytecode across platforms.