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1. Run-time data area1.1. Program counterThread-Private, byte-code line number indicator executed by the current thread,The multithreading of a Java Virtual machine is assigned by threads that switch processor execution time in turn1.2. Java Virtual

"Survival or death" how to determine whether the object is alive? Two algorithms are given in this paper, namely, the reference counting algorithm and the accessibility analysis algorithm. Reference counting algorithm The idea of the algorithm is simple and easy to implement. We add a reference counter to the object, and when there is a place to reference it, the reference counter adds one, and when the reference fails, the counter is reduced by one, and when the counter is 0 o'cloc

Lifecycle of a Java Virtual Machine The duty of a runtime Java Virtual Machine instance is to run a JavaProgram. When a Java program is started, a

In Java application development process, we often encounter OutOfMemoryError exception, do not know what is the reason, at this time we need to know the Java memory model, find some information, the Java memory model summarized; Java memory structure, which is the data area at runtime

invocation with the class (method body) where the method resides, and for Java, the bindings are divided into static and dynamic bindings: Static bindings: That is, pre-binding. The method is already bound before the program executes, and is implemented by the compiler or other linker. For Java, a simple binding that can be understood as the program's compile time. In

phase is the execution class constructor The 1. When encountering the 4 bytecode directives of new, getstatic, putstatic, or invokestatic, if the class has not been initialized, it is necessary to trigger its initialization first. The most common Java code scenario for generating these 4 instructions is when you instantiate an object with the New keyword, read or set a static field of a class (except for the static fields that were final decorated, h

I. OverviewFor developers of C and C + + programs, in memory management, programmers have absolute access to memory, but also primarily to the correct use and cleanup of memory, which requires a high level of programmer.For Java programmers, with the help of the automatic memory management mechanism of the virtual machine, it is no longer necessary to write the p

1. JVM Life cycle Start. When a Java program is started, a JVM instance is generated, and any class that has the public static void main (string[] args) function can be used as a starting point for the JVM instance to run. Run. Main () is the starting point for the program's initial thread, and any other thread is started by that thread. Die. The JVM exits when all non-daemon threads in the program terminate, and the program can use t

Because the Java virtual machine contains heap memory, method area, virtual machine stack, local method stack and program counter five parts, wherein the program counter is the only piece of memory that does not occur the memory overflow exception, so only four memory areas

Brief introductionUnderstanding the benefits of Java Virtual Machine memory distribution1. Learn the details of Java memory management and help programmers write better-performing programs. For example, when the new thread is created, the JVM will create a dedicated stack for each thread, the stack is the advanced data

Java memory zone and Virtual Machine class loading mechanism I. Data Area During Java Runtime 1. Program counters The memory of "thread private" is a small memory space. It can be seen as the row number indicator of the bytecode executed by the current thread. The only region in the

　　There are 4 ways to describe memory allocation and recycling, namely how memory is allocated , what memory needs to be recycled , under What circumstances , and how to monitor and optimize the GC mechanism .Java GC (garbage collction) garbage collection mechanism is one of the main differences between Java and C + +. Self-reclaim some useless memory by tagging the memory in the JVM. The most current use i

Deep understanding of Java Virtual Machine-JVM advanced features and best practices Author: Zhou Zhiming Post-reading: I don't need to say much about this book. Many people recommend this book. After reading this book, I also feel very good. I strongly recommend this book as a java-related friend. The following are my