Agan Java Video--lesson2



Video information:
Duration: 109 minutes
In the Hope
Content: A brief History of Java technology, the Java Technology architecture, the role and characteristics of the JVM, the role and characteristics of the JDK and JRE, an introduction to the Java operating mechanism, the directory structure of the JDK and the JRE, an introduction to object-oriented analysis and design, the definition and understanding of classes, the definition and understanding of attributes, The definition and understanding of constructors, the definition and understanding of methods, the creation and use of objects.
Video Address: HTTP://USER.QZONE.QQ.COM/335816866/2




Supplemental content:

Operating System loading JVM is through JDK in Java.exe to complete , through the following 4 Steps to complete JVM Environment .

1. Creating a JVM load environment and configuration

2. loading jvm.dll

3. Initialize jvm.dll and hang bounds to jnienv (JNI Call Interface ) instance

4.calledjnienvinstance loading and processingclassclass

JavaVirtual MachinesJavaVirtual Machines (Java Virtual machine,JVM) is runJavamechanisms that are essential to the process. Post-compilationJavaprogram instructions are not directly in the hardware systemCpijon the execution, but by theJVMexecution. JVMis the compiledJavainterface between the program and the hardware system, the programmer canJVMas a virtual processor. It explains not only the execution of compiledJavainstructions, but also for security checks. It isJavaA reliable guarantee that the program can be seamlessly ported across multiple platforms, as well asJavathe security inspection engine for the program.

　
　　Java The virtual machine specification gives a JVM definition of: JVM is an imaginary machine that is implemented on a real machine in a software way. The code used by the JVM is stored in the. class file. Some of the instructions of the JVM are much like real CPU instructions, including arithmetic operations, flow control, and array element access.

Java The virtual machine specification provides compilation of all Java Code of the hardware platform. Because the compilation is for an imaginary machine, the specification enables Java program is platform Independent. It applies to each specific hardware platform to ensure that the JVM compiled code runs. The JVM can be implemented not only by software, but also by hardware.

JVM The specific implementation of cpij

JVM The code format is compressed bytecode, thus the efficiency is high. The program that is represented by the JVM Java Java Any interpreter must be able to execute in accordance with JVM Span style= "font-family: Song body; Font-size:10.5pt "> Any class file that defines the class file format.  

If you want to learn Java development technology less detours, welcome to join my classroom, here are more Java technology enthusiasts to communicate with you, grow together.

About Us: Focus on Java software development, software training industry. 2006 engaged in Java Software development work, has been Wuhan soft Emperor technology information Limited liability company software Development engineer, Henan Jie Xun Senior research and development engineer, Shanghai Wei Xun Zhengzhou Qingyang vice president, Henan IBM University students training base marketing manager, Zhengzhou Soft Chong Technology Co., Ltd. General manager.
CSDN Blog:http://blog.csdn.net/flywithcan qq:335816866, personal number flywithcan1983

Agan Java Video--lesson2