What makes Java dynamic?

Question

Options

• AAt runtime, classes are loaded as needed, and new code modules can be loaded on demand.
• BThe Java compiler uses reflection to convert source code directly into machine-language compilers.
• CThe Java compiler uses reflection to test if class methods are supported by resources of a target platform.
• DThe Java compiler preprocesses classes to run on specific target platforms.

• A
  81% (26)
• B
  9% (3)
• C
  6% (2)
• D
  3% (1)

Explanation

Java is dynamic because the JVM loads class files at runtime, only when they're actually needed - not all at once when the program starts. This allows programs to load new code modules on demand (via ClassLoader), enabling plugins, frameworks, and reflection-based features to work without recompilation.

Why the distractors are wrong:

• B is wrong on two counts: reflection is a runtime feature (not a compiler feature), and the compiler produces bytecode, not machine-language compilers.
• C confuses the compiler with the runtime; reflection checks method availability at runtime, not during compilation, and it's the JVM - not the compiler - that handles target-platform compatibility.
• D describes the opposite of Java's design philosophy; Java compiles to platform-independent bytecode, and the JVM handles platform specifics at runtime (Write Once, Run Anywhere).

Memory tip: Think of "dynamic" as "delayed" - Java delays class loading until the last possible moment at runtime, rather than locking everything in at compile time. If the answer mentions the compiler doing something dynamic, it's a trap.

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