Java Garbage Collection 面试题与答案
问题 16. Explain the concept of the 'garbage-first' (G1) garbage collector.
The G1 garbage collector is designed to provide high throughput and low-latency garbage collection. It divides the heap into regions and uses a series of Garbage-First (GF) queues to prioritize collection of regions with the most garbage.
问题 17. What is the 'OutOfMemoryError' in Java, and how is it related to garbage collection?
The 'OutOfMemoryError' is an exception thrown when the Java Virtual Machine (JVM) runs out of memory. It can occur if the garbage collector is unable to free up enough memory to satisfy the memory allocation request.
问题 18. Explain the concept of garbage collection ergonomics in Java.
Garbage collection ergonomics involves the JVM automatically tuning garbage collection parameters based on the characteristics of the application, such as heap size, pause time goals, and allocation rates.
问题 19. How does the Java Virtual Machine (JVM) handle circular references in garbage collection?
The JVM uses a reachability analysis to determine if objects are reachable or not. Circular references are handled by the garbage collector, which identifies and collects objects that are no longer reachable.
问题 20. What is the role of the '-Xmx' and '-Xms' JVM options in garbage collection?
The '-Xmx' option sets the maximum heap size, while the '-Xms' option sets the initial heap size. Properly configuring these options can impact garbage collection performance and overall application memory usage.
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