How to Compile and Run Java Program by Notepad

1. 
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   Create a class named as Calculator.This is just an example. You can create any class you want to create.
2. 
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   Save class Calculator as a Java file.Notice that it must be in Java format. Otherwise, it will fail to compile.
3. 
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   Name it as Calculator.java on the desktop. Alternatively, you can save it anywhere you want.
4. 
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   Open Plugins in the menu bar. Then choose "Show Plugin Manager".
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   Find Nppexec and click it in the options list-box.
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   Restart Notepad according to the instructions provided by the popup.
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   In the menu bar, choose Plugin->Nppexec->Execute.
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   In the command line, type: cd C:\Users\hhh\Desktop\Calculator.java, javac Calculator, java Calculator, and press enter after each command.

   • The format means cd $(CURRENT_DIRECTORY) , javac $(FILE_NAME) ,java $(NAME_PART).
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   Click OK , the program will compile and run. You can see the demonstration. It is a cool calculator, right?