Match each Java keyword to its primary purpose.
Drag a concept onto its matching description — or click a concept then click the description.
Prevents serialization of a field
Ensures visibility of changes across threads
Controls access to a block or method by threads
Ensures consistent floating-point behavior across platforms
Indicates a method is implemented in platform-dependent code
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
volatile: Ensures that a variable's value is always read from main memory, preventing thread caching.
The correct matches are volatile for visibility, transient for serialization exclusion, and synchronized for locking. Common mistakes include confusing volatile with transient and transient with thread safety.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
volatile: Ensures that a variable's value is always read from main memory, preventing thread caching.
Why this is correct
Volatile correctly ensures visibility of variable changes across threads.
transient: Indicates that a field should not be serialized.
Why this is correct
Transient correctly marks a field to be excluded from serialization.
synchronized: Provides a lock mechanism to ensure only one thread can access a code block at a time.
Why this is correct
Synchronized correctly ensures mutual exclusion in multithreaded access.
volatile: Prevents a field from being serialized.
Why it's wrong here
Incorrect — this describes transient, not volatile.
transient: Ensures thread safety for a variable.
Why it's wrong here
Incorrect — transient does not affect thread safety; that is the purpose of volatile or synchronized.
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