![]() G1 or Garbage First collection from JDK 1.7 release. Expect release of new Garbage collector algorithm in every major release e.g. Garbage Collection in Java is a big topic and with every new release of JDK it becomes more and more sophisticated. You can still code viruses with it but since those retards who had to receive a higher education just to delve into this stuff can't easily code a virus the company thinks that it's okay to claim that it's safe. I'm sorry to tell you this, but JAVA is still crap. Thanks a lot for putting such wonderful set of questions. No matter how many, please put those in subsequent parts and give the links for those in this post. Why don't you put next set of questions on GC that you have in your bank. What is your view on this question? Does my answer is good enough, is there any GC tuning setting related to this? So in order to reduce major collection, we can either create short lived object, which will get collected during minor collection without pause or better create Immortal object, which doesn't get GC'd. My answer was primarily based on my experience that Major collection introduce stop the world pause. I was asked, How to reduce GC pause time in Java application? This was an interview to work in there high frequency system, where latency was very important. How can I see what garbage collector is running on my java process ? I dont have access to the java paramters in my appserver. This is the most practical stuff I would like to See in Java programmer if claims he understand GC in Java. ![]() Much better than any other list of Garbage collection interview Questions in Java, My favorite among all is question related to GC logs. See Java Performance The Definitive Guide for more details on this topic. I always suggest answering these kinds of questions in detail. This is a kind of Garbage collection interview question that gives you an opportunity to show your knowledge in detail while answering. It increases the overall throughput of application my minimizing time spent in Garbage collection but still has long pauses during full GC. Throughput Garbage collector can be enable using -XX:UseParallelGC or -XX:UseOldParallelGC. Though both major and minor collection runs on stop-the-world fashion and introduced pause in the application. On the other hand Throughput garbage collector is a parallel collector where minor and major collection happens in parallel taking full advantage of all the system resources available like multiple processors. ![]() Serial GC is most suited for small applications with fewer threads while throughput GG is more suited for large applications. The Serial Garbage collector also defaulted GC in JDK 1.4 before ergonomics was introduced in JDK 1.5. Serial Garbage collector can be enabled using JVM option -XX:UseSerialGC and it's designed for Java application which doesn't have pause time requirement and has client configuration. ![]() It’s recommended to prepare questions from Java collection, multithreading, and programmingalong with Garbage collection to do well in Java interviews at any stage.Īnswer: Serial Garbage collector is a stop the world GC which stops application thread from running during bo th minor and major collection. I have included a few Garbage collection interview questions and answers from GC output to help with that. One more thing which is getting very important is the ability to comprehend and understand Garbage collection Output, more and more interviewer are checking whether the candidate can understand GC output or not.ĭuring Java interview, they may provide a snippet of GC output and ask various questions based on that like Which Garbage collector is used, whether the output is from the major collection or minor collection, How much memory is free from GC, What is the size of new generation and old generation after GC, etc. As I said GC is an important part of any Java interview so make sure you have good command in GC. These questions are based upon the concept of How Garbage collection works, Different kinds of Garbage collectors, an d JVM parameters used for garbage collection monitoring and tuning. In this Java Interview article, I will share some questions from GC which is asked in various core Java interviews. Apart from Java Collection and Thread many tricky Java questions stem Garbage collections which are tough to answer. Garbage collection interview questions are very popular in both core Java and advanced Java Interviews. ![]()
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