Question: When I try to do: java -jar encoder.jar -i source.txt in the terminal, it says that 'java' is not recognized as a operable program

[1newbie1]

So i tried to use this command, but my computer says that 'java' is not recognized as a command

java -jar encoder.jar -i source.txt

[Teabot 5000]

Is Java installed? And if it is installed, has the environmental variable for it's path been set?

[xcoder]

java -jar "C:\tmp\encoder.jar" -i "C:\tmp\source.txt"