garbage collection in java interview questions

object during these two marks, it is essentially a recyclable object.Summarize the more common cases where objects are judged as recyclable:1) Assign a reference to null or point a reference to an object to a new object, such as the following code:1 New Object (); 2 NULL ; 3 New Object (); 4 New Object (); 52) The object that the local reference refers to, such as the following code:1 void Fun () {23 ..... 4 for (int i=0;i) {5 New Object (); 6 System.out.println (Obj.getcla

generational mechanism is that this place is recycled only when the full GC is in place, and the area is not compressed.In Java, you can configure parameters so that large objects (greater than the set threshold) go directly to the old age (avoid doing a lot of copying on younger generations).The memory that is reclaimed by the JVM is returned to the operating system only under certain conditions. (see:http://stackoverflow.com/

The previous post talked about performance problems caused by memory allocation differences between the reference type and basic type. Today, let's talk about topics related to memory release (mainly GC.Statement in advance: although sun has been swallowed up by Oracle, sun is still known as sun due to habits and lazy typing. ★JVM memoryIn the Java Virtual Machine specification (For details, refer to "here"), the following types of memory space are me

assume that garbage collection occurs at any time, all of which are unknown. For example, a temporary object in a method becomes a useless object when the method call is complete, and its memory can be freed at this time.(2) Java provides a number of classes that deal with garbage

, unmarked objects are inaccessible and are collected. The basic tracking algorithm is called " Mark and Clear," which indicates two phases of the garbage collection process.(8) The Java Virtual machine's garbage collector may have a strategy for dealing with heap fragments. The two strategies that are typically used t

This article is the third in a series of articles for the Java GC expert. In the first article, "Becoming a JAVAGC expert Part I-Java garbage collection mechanism" we learned about the execution of different GC algorithms, how the GC works, what is the new generation and the old age, what you should know about the 5 GC

In the memory area of the Java Virtual machine, the program counter, the virtual machine stack, and the local method stack three areas are thread-private, generates with the thread, and out of line, with the stack frame in the stack and out of the stack as the method enters and exits, the amount of memory allocated per stack frame is basically known when the class structure is determined. As a result, memory allocation and recycling in these three reg

In-depth understanding of Java garbage collection mechanismI. The significance of garbage collection mechanismA notable feature of the Java language is the introduction of a garbage

beyond the boundaries of the area.Generational collection AlgorithmsAs you can see from the discussion above, different recycling strategies are used depending on the lifetime of the object. Some objects have a shorter survival time, so the replication algorithm can be used when there are fewer surviving objects per collection. Some objects have a longer time to live, so fewer objects need to be recycled e

In Java, the allocation and recycling of object memory space is done automatically by the garbage collection process in the JVM. Unlike the C language, developers do not need to write code specifically for garbage collection in Java