Java language Programming JDK configuration environment

1)java_home indicates the JDK installation path,

Just the path you chose when you installed it. C:\Program files\java\jdk1.8.0_121,

This path includes the Lib,bin,JRE and other folders (this variable is best set, since running Eclipse will need to follow this variable);

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2)path allows the system to identify Java commands under any path , set to:%java_home%\bin;%java_home%\jre\bin

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3)CLASSPATH is the Java Load Class (class Orlib) path, only the class in CLASSPATH ,the Java command can be recognized,

set as:.; %java_home%\lib\dt.jar;%java_home%\lib\tools.jar ( to be added . Represents the current path )

Note:%java_home% is referring to the previously specified java_home;

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4) in cmd command line input: Java–versionjavac

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5) Write the first Java program:

This is the first program I wrote examplel_l

public class Examplel_l {

publicstatic void Main (String []args) {

System.out.print (" Hello ! you are welcome to study The Java language. ");

}

}

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5) Compiling examplel_l

1. First CD to create the examplel_l directory

2. Then compile the command as:Javacexamplel_l.java

3. execute the compiled file javaexamplel_l

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This article is from the "Qinnengbuzhuo" blog, make sure to keep this source http://4468289.blog.51cto.com/4458289/1907944

Java language Programming JDK configuration environment