1 8 java virtual machine

Summary after reading Java Virtual Machine 1) Sun HotSpot JVM Memory Model 2) Sun HotSpot JVM Memory Allocation Iii) Sun HotSpot JVM memory monitoring 4) Sun HotSpot JVM garbage collection Based on Sun HotSpot JVM Direct: 650) this. width = 650; "style =" border-bottom: 0px; border-left: 0px; border-top: 0px; cursor:

Program Java runtime data zone: A. Method Area ----------- (common threads) B. Heap --------- (threads in total) C. Virtual Machine stack --------- (thread private) D. Local method stack ----------- (thread private) E. Program counters --------- (thread private) Note: A. The thread is private. That is to say, each thread has A zone such as C, D, and E, so that it

. Start as complete as SUNJDK. Also note that OpenJDK only contains the most streamlined JDK, and if the OpenJDK of the Icetea patch is used, OpenJDK command "java-version" displays not OpenJDK, but Java.Two installation Environment Preparation This article is selected in the VirtualBox, using the Ubuntu 14.04 32-bit version of the image, the main system is Ubuntu 16.04 64, why I was the real machine is Ubu

Program Java runtime data zone: A. Method Area ----------- (common threads) B. Heap --------- (threads in total) C. Virtual Machine stack --------- (thread private) D. Local method stack ----------- (thread private) E.ProgramCounter ----------- (thread private) Note: A. The thread is private. That is to say, each thread has a zone such as C, D, an

initialization by completing the initialization of the static variable and static code block of the class. Examples are as follows:The classes that need to be loaded Reflect.java as follows: Public classReflect {Private intUserName; Private intpassword; Static{System.out.println ("Reflect static Block"); } PublicReflect () {System.out.println ("Reflect Constructs"); } Public intGetUserName () {returnUserName; } Public voidSetusername (intuserName) { This. UserName =UserName; }

1. PrefaceThere are several more important concepts that need to be popularized before garbage collection.2. Concepts and differences in memory overflow and memory leaks:(1): Memory overflow: Refers to the program in the application of memory, there is not enough memory space to allocate, the system can not meet the requirements, there is an out of memory; for example, an int was applied, but it saved a lon

Java Virtual Machine Summary: Java Virtual MachineJvm Memory Model UProgram counters UJavaStack(Virtual Machine Stack) ULocal method Stack UJavaHeap UMethod Area and Its runtime poolGar

Deep understanding of Java Virtual Machine-learning notes and deep understanding of Java Virtual Machine JVM Memory Model and partition JVM memory is divided: 1.Method Area: A thread-sh

Java memory zone and Virtual Machine class loading mechanism, Java Virtual Machine I. Data Area During Java Runtime 1. Program counters "Th

can be performed after the initialization stage in some cases to support dynamic binding of the java language. Virtual Machine specifications strictly stipulate that class initialization must be performed immediately in five cases: (called active reference to class) (1) When four bytecode commands, namely new, getstat

deep understanding of the Java Virtual Machine.3. Data Types supported by Java Virtual MachineJava Virtual Machine supports the following basic data types:Byte: // complement of a sign

Memory introduction of Java virtual machine, Java Virtual Machine Introduction This article describes the Memory Distribution of the Java Virtual