How to check whether java jdk is installed or not on windows?

After doing setup of  jdk, some user are in confusion whether the installation is completed successfully or not.
After jdk installation , user have to setup the PATH and JAVA_HOME variables.

here, jdk is the main folder.
PATH :  ..../jdk/bin          and                JAVA_HOME :  .../jdk

After completing all those step , open cmd prompt
Write java -version
if the output persist with java version means the jdk installed completely.
See the below images.