garbage collection in java interview questions

Here, I do not have a theoretical way to describe the principle of garbage collection mechanism. I have only 2 simple programs to explore my understanding of the Java garbage collection mechanism. After all, many things, theoretical terminology may not be intuitive to test b

This is the second article in the article "becoming a GC expert series." In the first understanding of Java garbage Collection, we learned several different GC algorithm processing processes, the way GC works, the difference between the new generation and the old age. So far, you should have known about the 5 GC types in JDK 7, and the performance impact of each

IntroductionThe garbage collection technology was not the first in the Java language, and the 1960 birth of the Lisp at MIT was the only language that really used memory dynamic allocation and garbage collection techniques. The three issues to consider in the

Click to enter _ more _java thousand ask1, how to judge the garbage objectThe first step in garbage collection is to first need an algorithm to mark what is garbage and then dispose of the garbage. The usual programming language will be judged using one of the following algo

{6Prev =NewBrowser ();//because of the memory crunch, the soft-referenced objects are recycled7SR =NewSoftReference (prev);//re-build8}This will be a good solution to the actual problem.A soft reference can be used in conjunction with a reference queue (Referencequeue), and if the object referenced by the soft reference is reclaimed by the garbage collector, the Java Virtual machine will add the soft refere

Click to enter _ more _java thousand ask 1, how to judge the garbage object The first step in garbage collection is to need algorithms to mark which ones are garbage, and then to dispose of the garbage. The usual programming language is judged by one of the following algorit

Garbage collection from the JVM is a cliché, and here I'm going to talk to you about garbage collection.1 where to collect the rubbish?2 What can be considered rubbish?3 How to recycle rubbish?Where to collect rubbishHere, I suggest you read my book: Java Memory management5

. In general, the Java heap is divided into the new generation and the old age, so that according to the characteristics of each era to adopt the most appropriate collection algorithm. In the new generation, each garbage collection is found to have a large number of objects died, only a small number of survival, then c

Last month, we analyzed reference counting, copying, tagging-clearing, and tagging-sorting out these classic garbage collection techniques. Each of these methods has its advantages and disadvantages under certain conditions. For example, when a lot of objects become garbage, replication can do a good job, but when there are many long-lived objects it becomes bad

satisfies both conditions, these objects can be judged as a memory leak in Java, which is not reclaimed by the GC, but it consumes memory. The following is an example of a memory leak:Vector v=new vector (ten); for (int i=1;i) { object o=new object (); V.add (o); o=null; }We iterate over the object object and put the requested objects into a vector, and if we just release the reference itself, then the vector still references

This article is the second in a series of articles for the Java GC expert. In the first "Understanding Java garbage Collection mechanism" we learned the implementation of different GC algorithms, how the GC works, what is the new generation and the old age, you should understand the JDK7 of 5 types of GC, and the impac

1. The core idea of garbage collection algorithm The Java language establishes a garbage collection mechanism for tracking objects that are in use and for discovering and reclaiming objects that are no longer in use (references). This mechanism can effectively guard against

This article Importnew-Wang Xiaojie without permission, prohibit reprint!What are the benefits of understanding the garbage collection mechanism (GC) for Java developers? The first thing you can do is to satisfy your curiosity as a software engineer, and second, to learn more about how GC works can help you write better Java