garbage collection in java interview questions

Transferred from: http://www.cnblogs.com/laoyangHJ/archive/2011/08/17/JavaGC.html——————————————————————————————————The Java heap is a run-time data area in which instances (objects) of the class allocate space. The Java Virtual machine (JVM) heap stores all objects created by running applications, which are established through directives such as new, NewArray, Anewarray, and Multianewarray, but they do not

, idisposable{// fields}Sure enough, this is true, that is, once the control range of the using statement is out, the Dispose method is automatically called to destroy the object resource. It is said that the Close method is also called Dispose () to see the source code: Public void Close () {this. Dispose (true);Well, really, if we manually invoke the close of ADO, it is also possible to close the database connection with the database resource.Plus:python's memory management is also controlled

1. The meaning of garbage collectionIn C + +, the memory occupied by an object is occupied until the end of the program and cannot be assigned to other objects until it is explicitly released, whereas in Java the memory becomes garbage when there is no object reference to the memory originally assigned to an object. A system-level thread of the JVM automatically

1. The meaning of garbage collectionIn C + +, the memory occupied by an object is occupied until the end of the program and cannot be assigned to other objects until it is explicitly released, whereas in Java the memory becomes garbage when there is no object reference to the memory originally assigned to an object. A system-level thread of the JVM automatically

This article is reproduced, but I forgot to reprint from where, hope the original author see Don't blame1. The meaning of garbage collectionIn C + +, the memory occupied by an object is occupied until the end of the program and cannot be assigned to other objects until it is explicitly released, whereas in Java the memory becomes garbage when there is no object r

memory space to allocate when the program runs, the program will crash. In general, the memory space that is allocated but cannot be recycled is called "Memory leakage (memory leaks )". The potential danger of the above program design is not allowed in a rigorous and secure language such as Java. However, the Java language neither limits the freedom of programmers to write programs nor removes part of decl

1 Introduction The Java heap is a runtime data zone, and the instance (object) of the class allocates space from it. The Java Virtual Machine (JVM) Heap stores all objects created by running applications. These objects are created through commands such as new, newarray, anewarray, and multianewarray, however, they do not need program code to be explicitly released. In general, the heap is responsible for

IntroductionThe Java heap is a runtime data zone, and the instance (object) of the class allocates space from it. The Java Virtual Machine (JVM) Heap stores all objects created by running applications. These objects are created through commands such as new, newarray, anewarray, and multianewarray, however, they do not need program code to be explicitly released. In general, the heap is responsible for

The Java heap is a run-time data area in which instances (objects) of the class allocate space. The Java Virtual machine (JVM) heap stores all objects created by running applications, which are established through directives such as new, NewArray, Anewarray, and Multianewarray, but they do not require program code to be explicitly released. In general, the heap is responsible for

Java garbage Collection algorithmIntroductionThe Java heap is a run-time data area in which instances (objects) of the class allocate space. The Java Virtual machine (JVM) heap stores all the objects that are created by the running application.These objects are established t

Java garbage collection mechanism The blog named Java garbage collection mechanism, giving people feel like garbage collection is uniq

To understand the Java garbage collection mechanism, it is important to understand the JVM memory pattern first. Today we will understand the various parts of the JVM's memory, how to monitor it, and the garbage collection tuning.Java (JVM) memory modelAs you can see from th

Document directory (1) do not explicitly call system. GC () (2) minimize the use of temporary objects (3) it is best to explicitly set the object to null when it is not used. (4) Try to use stringbuffer instead of string to accumulate the string (For details, refer to the string and stringbuffer in another blog article in Java) (5) You can use basic types such as int and long to remove integer and long objects. (6) Use as few static object var

Objective In the C + + language, programmers must handle every memory allocation with care, and must manually release the memory space that has been occupied after the memory is used. A memory leak problem occurs when the memory is not fully released, that is, the allocated, but never-freed, block. In the Java language, it gives programmers a good promise: programmers don't need to manage memory because the JVM has GC to automate

Java garbage collection mechanismWhen it comes to garbage collection (garbage collection,gc), many people naturally connect it to Java. In

Java garbage collection mechanismWhen it comes to garbage collection (garbage collection,gc), many people naturally connect it to Java. In

Java garbage collection mechanismWhen it comes to garbage collection (garbage collection,gc), many people naturally connect it to Java. In

Common Definitions Java garbage Collection garbage collection in idle time in an irregular manner, reclaiming the memory space occupied by objects without any references, rather than the object itself conditions that trigger the primary GC (

First, why the need for garbage collectionWithout garbage collection, memory will be consumed sooner or later because we are constantly allocating memory space without recycling. Unless the memory is infinitely large, we can be self-willed and not recycled, but that is not the case. Therefore, garbage

About the session garbage collection mechanism! Seession. gc_maxlifetime1440; seesion. gc_probalility1; session. gc_divisor1000; in my understanding above, sessions can be used only by users with one thousandth point. but if the probability is one thousandth point, it is wrong. how does the session work ?? Please give me a satisfactory explanation .. ------ Solution-about the session