Java environment variable configuration issues

You want to configure three environment variables
Java_home
CLASSPATH
Path
Have you configured it?

System variables → new java_home variable.
Variable value fill in the JDK installation directory (I am E:\Java\jdk1.7.0)

System variables → find Path variable → edit
Enter%java_home%\bin;%java_home%\jre\bin at the end of the variable value;
(Note that the original path of the variable value at the end of there is no; number, if not, first enter; number and then enter the above code)

System variables → new CLASSPATH variable
Variable values are filled in.; %java_home%\lib;%java_home%\lib\tools.jar (Note that there is a point in the front)

System Variable Configuration complete

Verify that the configuration is running successfully cmd input java-version (there are spaces between Java and-version)

Microsoft Windows [version 6.1.7601]
Copyright (c) Microsoft Corporation. All rights reserved.

C:\users\administrator>java-version
Java Version "1.8.0_65"
Java (TM) SE Runtime Environment (build 1.8.0_65-b17)
Java HotSpot (TM) 64-bit Server VM (build 25.65-b01, Mixed mode)

C:\users\administrator>java
Usage: Java [-options] class [args ...]
(Execution Class)
or Java [-options]-jar jarfile [args ...]
(Execute JAR file)
Among the options are:
-d32 using a 32-bit data model (if available)
-d64 using a 64-bit data model (if available)
-server selecting the "Server" VM
The default VM is server.

Class search paths for-CP < directories and Zip/jar files >
Class search paths for-classpath < directories and Zip/jar files >
With Delimited directories, JAR archives
And a list of ZIP archives to search for class files.
-d< name >=< value >
Setting System Properties
-VERBOSE:[CLASS|GC|JNI]
Enable verbose output
-version output product version and exit
-version:< value >
Warning: This feature is obsolete and will be
Removed in future releases.
The specified version is required to run
-showversion output product version and continue
-jre-restrict-search | -no-jre-restrict-search
Warning: This feature is obsolete and will be
Removed in future releases.
Include/exclude user-specific JRE in version search
-? -help Output This Help message
-X output Help for non-standard options
-ea[:<packagename>...|:<classname>]
-enableassertions[:<packagename>...|:<classname>]
Enable assertion at the specified granularity
-da[:<packagename>...|:<classname>]
-disableassertions[:<packagename>...|:<classname>]
Disables assertions with the specified granularity
-esa | -enablesystemassertions
Enable System assertion
-DSA | -disablesystemassertions
disabling system assertions
-agentlib:<libname>[=< option;]
Load the native agent library <libname>, for example-agentlib:hprof
See also-agentlib:jdwp=help and-agentlib:hprof=help
-agentpath:<pathname>[=< option;]
Load the native agent library by full path name
-javaagent:<jarpath>[=< option;]
Load the Java programming language proxy, see java.lang.instrument
-splash:<imagepath>
Displays the splash screen using the specified image
For more information, see Http://www.oracle.com/technetwork/java/javase/documentatio
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C:\users\administrator>javac
Usage: Javac <options> <source files>
Among the possible options are:
-G generates all debug information
-g:none does not generate any debug information
-g:{lines,vars,source} only generates some debugging information
-nowarn does not generate any warnings
-verbose output messages about the actions that the compiler is performing
-deprecation output using outdated API source location
-classpath < paths > specifying where to find user class files and comment handlers
-CP < paths > specifying where to find user class files and comment handlers
-sourcepath < paths > Specify where to find the input source files
-bootclasspath < path > Overwrite the location of the boot class file
-extdirs < directories > overriding locations for installed extensions
-endorseddirs < directory > location of standard paths for overwriting signatures
-proc:{none,only} controls whether annotation processing and/or compilation is performed.
-processor <class1>[,<class2>,<class3>] The name of the comment handler to run; Bypass the default
Ride
-processorpath < paths > specifying where to find comment handlers
-parameters generating metadata for reflection of method parameters
-D < directories > specify where to place the generated class files
-S < directory > specify where to place the generated source files
-H < directory > specify where to place the generated native header file
-implicit:{none,class} Specifies whether to generate a class file for an implicit reference file
-encoding < encoding > specifying the character encoding used by the source file
-source < release > provides source compatibility with a specified release
-target < release > Generate a class file for a specific VM version
-profile < profile > Make sure that the API used is available in the specified configuration file
-version Version Information
Summary of-HELP output standard options
-a keyword [= value] The option to pass to the comment handler
-X output a feed of non-standard options
-j< tag > Direct < tag > pass to the runtime system
-werror terminating compilation When a warning occurs
@< file name > read from File option and file name

C:\users\administrator>

Java environment variable configuration issues