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This article mainly introduces the development history of java and the relevant knowledge of how to build the environment, the content is detailed and easy to understand, the operation is simple and fast, and has a certain reference value. I believe you will gain something after reading the history of the development of java and how to build the environment. Let's take a look.

1.1 introduction to java

James Gosling (James Gosling), a software expert, was born in Canada on May 1955. One of the co-founders of the Java programming language, he is generally recognized as the "father of Java".

1.2 sun Company

Sun acquired 1 billion mysql in 2008 and was acquired by oracle in 2009

1.3History of java

In early 1990, it was originally named Oak

On May 23, 1995, the Java language was born.

In January 1996, the first JDK-JDK1.0 was born.

In April 1996, the 10 leading operating system vendors announced that they would embed Java technology in their products.

In September 1996, about 83000 web pages were created using Java technology.

On February 18, 1997, JDK1.1 released

On April 2, 1997, the JavaOne meeting was held with more than 10, 000 participants, setting a record for similar meetings in the world at that time.

In September 1997, the members of the JavaDeveloperConnection community exceeded 100, 000

In February 1998, JDK1.1 was downloaded more than 2000000 times.

Java 2 enterprise platform J2EE was released on December 8, 1998.

In June 1999, SUN released three versions of Java: standard Edition (J2SE), Enterprise Edition (J2EE) and Micro Edition (J2ME).

On May 8, 2000, JDK1.3 released

JDK1.4 released on May 29th, 2000

On June 5, 2001, Nokia announced that it would sell 100 million Java-enabled mobile phones by 2003.

On September 24th, 2001, J2EE1.3 released

J2SE1.4 was released on February 26th, 2002. since then, the computing power of Java has been greatly improved.

J2SE1.5 was released on September 30th, 2004, which became another milestone in the history of Java language development. To show the importance of this version, J2SE1.5 changed its name to Java SE 5.0

In June 2005, the JavaOne conference was held, and SUN made Java SE 6 public. At this point, various versions of Java have been renamed to cancel the number "2": J2EE renamed Java EE,J2SE to Java SE,J2ME renamed Java ME

In December 2006, SUN released JRE6.0

Sun acquired mysql in 2008

On April 20, 2009, Oracle acquired the copyright of java by buying SUN for $7.4 billion, which is rumored to be bad news for Java programmers (quite the opposite)

In November 2010, Apache threatened to quit Java because of Oracle's unfriendliness to the JCP community.

Oracle released Java SE 7 on July 28, 2011.

Oracle released Java SE 8 LTS on March 18, 2014.

Oracle releases Java SE 9 on September 22,2017

Oracle releases Java SE 10 on March 21, 2018

Oracle released Java SE 11 LTS on September 26th, 2018

Oracle publishes Java SE 12 on March 19, 2019

17 September 2019 Java SE 13 Text Blocks (Preview)

March 17, 2020 Java SE 14

17 September 2020 java SE 15

JAVA_HOME = d:\ jdk

CLASSPATH =.;% JAVA_HOME%\ lib;%JAVA_HOME%\ lib\ dt.jar;%JAVA_HOME%\ lib\ tools.jar

PATH = add.;% JAVA_HOME%\ bin;%JAVA_HOME%\ lib before

There is no jre after jdk9. Set up the jre program directory with the following command

Bin\ jlink-module-path jmods-add-modules java.desktop-output jre

1.4 words related to java

Jdk Java Development Kit java Development Kit

Jre Java Runtime Environment java operating environment

Jvm Java Virtual Machine java virtual machine

1.5 java program compilation and running process

The java source program .java file is generated by the compiler and saved in the .class file. At run time, jvm is responsible for interpreting the byte code, converting it into real computer instructions, and executing it.

1.6 Test the java development environment

C:\ > java-versionjava version "15.0.1" 2020-10-20Java (TM) SE Runtime Environment (build 15.0.1 / 9-18) Java HotSpot (TM) 64-Bit Server VM (build 15.0.1 / 9-18, mixed mode, sharing) C:\ > javac-versionjavac 15.0.1 C:\ > jshell | Welcome to JShell-version 15.0.1 | get a general idea of this version Type: / help introjshell > System.getProperty ("os.name") $1 = = > "Windows 7" jshell > System.getProperty ("java.version") $2 = > "15.0.1" jshell > System.getProperty ("java.home") $3 = > "D:\\ jdk\\ jdk-15.0.1" jshell > 13016 $4 = > 208jshell > / exit | Goodbye C:\ > 1.7 Java first program is written and compiled and run (1), open notepad Programming program

Package cn.webrx;import java.util.stream.IntStream;public class Demo {public static void main (String...s) {System.out.println ("hello world"); / / find 1, 2, 3, 3, 1, 2, 3, 3, 1, 2, 3, 3, 1, 2, 3, 3, 3, 3, 3, 1, 2, 3, 3, 3, 3, 3, 3, 3, 2, 3, 3, 3, 3, 3, 2, 3, 3, 3, 3, 2, 3, 3, 3, 3, 3, 2, 3, 3, 3, 3, 2, 3, 3, 3, 3, 3, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3 System.out.printf ("1 / 2 / 3 / 3 / 100% d", IntStream.rangeClosed (1100). Sum ());}} (2), save as c:/abc/Demo.java

(3) compile and run

Microsoft Windows [version 6.1.7601]

Copyright (c) 2009 Microsoft Corporation. All rights reserved.

If it is a new version after java11, you can run the source code java directly

C:\ abc > java Demo.javahello world1+2+3+...+100=5050C:\ abc > javac Demo.javaC:\ abc > java Demo

Error: main class Demo cannot be found or cannot be loaded

Reason: java.lang.NoClassDefFoundError: cn/webrx/Demo (wrong name: Demo)

Compiler-d. Compiling program classes with packages will automatically create a directory

C:\ abc > javac-d. Demo.java

Run the program:

C:\ abc > java cn.webrx.Demo

Hello world

1 "2" 3 ".. 100" 5050

C:\ abc >

This is the end of the article on "the Development History of java and how to build the Environment". Thank you for reading! I believe you all have a certain understanding of "the history of java and how to build the environment". If you want to learn more, you are welcome to follow the industry information channel.

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