: No

No, both System.gc() and Runtime.gc() in Java do not guarantee garbage collection. These methods suggest to the JVM (Java Virtual Machine) that it would be a good time to perform garbage collection, but the decision to actually perform garbage collection is ultimately left to the JVM’s discretion.

The JVM is free to ignore these requests and may choose to perform garbage collection at its own pace based on its internal algorithms and memory management policies. Explicitly calling System.gc() or Runtime.gc() is generally discouraged, as it can lead to unpredictable behavior and may interfere with the JVM’s optimization strategies.

Garbage collection in Java is automatic, and the JVM typically decides when and how to reclaim memory based on factors such as memory pressure, heap size, and application demands. Developers are encouraged to rely on the automatic garbage collection mechanism and let the JVM manage memory efficiently.