Black Horse Programmer-----Java Overview and basic syntax

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Chapter One Java overview and basic syntaxFirst, Java overview1. what is Java?

Java is an object-oriented, network-oriented, cross-platform, high-level computer programming language, which was launched by Sun (Stanforduniversity Network) company in 1995. As the most popular programming language in the world, Java continues to roll out its new version and new technologies to meet the rapid development of computer technology and increasingly diversified market demands, and the Java version is now updated to Java8, Java also introduces three technical systems to meet the needs of different customer groups for it technology, the following simple to learn java.

Three technical frameworks for 2.Java:Javaee:java Platform Enterprise Edition, the development of applications in the corporate environment, mainly for the development of web programs;Javase:java Platform Standard Edition, complete the development of desktop applications, is the basis of the other two;Javame:java Platform Micro Edition, the development of electronic consumer products and embedded devices, such as mobile phone programs;3.Java platform Architecture:JDK,JRE, JVM Jdk:java Development Kit,java Development and operating environment, Java development tools and JRE. Jre:java Runtime Environment,java program run environment, Java run the required class library +JVM (Java Virtual machine). JVM: is a part of the JRE, it is a fictitious computer, is through the actual computer simulation simulation of various computer functions to be implemented . 4. Configuration of environment variablespurpose: To allow the Java Jdk\bin Directory tool to run under any directory. Configuration method: Right-click on "Computer"-"Properties"-"Advanced system Settings"-"Environment variables", select "System Variables" under "path" variable double-click Open, after the "Variable value" text box to add the JDK installation path, in English ";" Separate from the other file paths, click the OK button.

Second, Java Basic syntax

Black Horse Programmer-----Java Overview and basic syntax