Which two statements are true about the Java Runtime Environment (JRE)?

Question

Options

• AIt is responsible for garbage collection.
• BIt interprets bytecode stored in a .class file.
• CIt contains the JDK and Java APIs.
• DIt is platform independent.
• EYou must install the JRE to compile a .java file.

• B
  91% (40)
• C
  2% (1)
• D
  5% (2)
• E
  2% (1)

Explanation

B is correct because the JRE contains the JVM (Java Virtual Machine), which reads and executes the platform-neutral bytecode stored in .class files - this is the JRE's core purpose.

Why the distractors are wrong:

• A - Garbage collection is performed by the JVM, a component inside the JRE, not by the JRE itself as a whole; the distinction matters on exams.
• C - The relationship is reversed: the JDK contains the JRE (plus development tools like the compiler), not the other way around. The JRE does include Java APIs, but never the JDK.
• D - The JRE is platform-dependent - you download a different JRE for Windows, macOS, or Linux. It's the bytecode that is platform-independent ("write once, run anywhere").
• E - To compile a .java file you need the JDK (specifically javac). The JRE only handles running already-compiled .class files.

Memory tip: Use the hierarchy JDK ⊃ JRE ⊃ JVM - each layer contains the next. Developers need the JDK; end users only need the JRE to run programs; the JVM inside the JRE is what actually executes bytecode.

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