Check your javac path on Windows using Windows Explorer C:\Program Files\Java\jdk1.7.0_02\bin and copy the address.
Go to Control Panel. Environment Variables and Insert the address at the beginning of var. Path followed by semicolon. i.e C:\Program Files\Java\jdk1.7.0_02\bin; . Do not delete the path existent, just click in and go to the left end and paste the line above. Do not try anything else, because you just need to link your code to "javac.exe" and you just need to locate it.
Close your command prompt and reopen it,and write the code for compile and execution.
You could refer to the following thread for more information: https://www.edureka.co/community/4800/unable-resolve-error-recognized-internal-external-command
Hope this helps!
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