How to open java after installation

How to open java after installation: first configure the JDK path, classpath, [JAVA_HOME] into computer variables; then enter cmd to enter the console, and enter [java -version] in the console; finally Write a [.java] text file directly locally.

How to open java after installation:

First of all: first configure the JDK path, classpath, and JAVA_HOME into the computer variables.

Then: Test whether the JDK is installed successfully, enter the computer console, XP is [Start Menu->Run Options], Win7 is [Start Menu->Search Content], enter cmd to enter the console, in Enter java -version in the console. If the version number can be displayed normally, it means the installation is successful;

Finally: Write a .java text file directly locally, and enter the current path of the .java file through the console, javac filename. java, a compiled .class file will appear in the original file path, and then execute java filename through the console to compile the java file successfully.

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