Java foundation-lesson1-environment variables

one, Run when environment variables are not configured Java Programs

D:\java-wangying\javase\java\jdk1.7.0_79\bin>javac D:\Java-wangying\JavaSE\code Helloworld.java

Compiling Java Programs When environment variables are not configured

Hello world!

D:\java-wangying\javase\java\jdk1.7.0_79\bin>java-classpath D:\Java-wangying\JavaSE\code HelloWorld

running Java programs

Hello world!

D:\java-wangying\javase\java\jdk1.7.0_79\bin>

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second, Configure Environment variables

Right button "my computer"--"properties"--"advanced settings"--"environment variables"

Configure three environment variables: Java-home;CLASSPATH;Path(no Environment variable, some edit directly)

JAVA-HOME:JDK Installation Path

CLASSPATH:Java Program Path

Path: file path

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Iii. Preparation of Java Program Helloworld.java

public class HelloWorld {

public static Voidmain (string[] Arg) {

System.out.println ("helloworld!");

}

}

the file name and class name are the same

Iv. Compile and run

public class HelloWorld {

publicstatic void main (string[] Args) {

System.out.println ("helloworld!");

}

}

Javac-d bin Src/helloworld.java

/**

-d means the specified storage path, that is, the compiled file into the * * folder, such as no- D will be directly compiled into the * * folder

*,

Java-cp bin HelloWorld// run,-cp Specifies the path where the program Runs.

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Java foundation-lesson1-environment variables