Java Garbage Collection 面试题与答案
问题 26. Explain the concept of 'Card Table' in the context of the G1 garbage collector.
The 'Card Table' is a data structure used by the G1 garbage collector to track changes in the heap. It allows the collector to efficiently identify and collect only the regions of the heap containing modified objects.
问题 27. What is the purpose of the 'System.gc()' method in Java?
The 'System.gc()' method is a hint to the JVM that suggests running the garbage collector. However, its actual execution is at the discretion of the JVM, and it may be ignored in some implementations.
问题 28. Explain the role of the '-XX:+UseG1GC' JVM option in enabling the G1 garbage collector.
The '-XX:+UseG1GC' option is used to enable the G1 garbage collector in Java. It instructs the JVM to use the G1 collector as the garbage collection algorithm.
问题 29. What is the 'CMSConcurrentAbortablePreclean' phase in the CMS garbage collector?
The 'CMSConcurrentAbortablePreclean' is a phase in the CMS (Concurrent Mark-Sweep) garbage collector that performs additional work on the Old Generation to prepare for the final mark phase. It is concurrent and aims to minimize pause times.
问题 30. Explain the concept of 'Shenandoah' garbage collector in Java.
Shenandoah is a low-pause-time garbage collector introduced in Java. It uses advanced techniques to perform garbage collection concurrently with application threads, minimizing pause times and improving overall responsiveness.
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