java 1 7 virtual machine

. 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. 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

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

standard Java virtual machines (JVMS) is that the Dalvik is based on registers and the JVM is based on stacks. Another major difference between Dalvik and Java is that the operating environment is--dalvik optimized to allow instances of multiple virtual machines to run concurrently in limited memory, and each Dalvik a