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Java Regular Expressions in Java

JT Keller
JT Keller
12,731 Points
Posted by JT Keller
JT Keller
12,731 Points

What to do for the Java tutorials if you're working out of an IDE and are trying to use the Console but get an error?

I'm actually going to answer my own question so that this is logged in case anyone else runs into this issue.

3 Answers

JT Keller
JT Keller
12,731 Points
JT Keller
JT Keller
12,731 Points

I've never used the Console class and was eager to try it out when I saw that Craig was using it in the regex course. However, I develop from within an IDE so the Console class will return a null exception if you're working in an IDE.

There are a couple of workarounds. You can just run the classes externally by setting the built classes in the bin directories on the JRE classpath or use a wrapper like one of the below.

Scanner userInput = new Scanner(System.in);
String line = userInput.nextLine();

//or

BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(System.in));
String line = bufferedReader.readLine();

Hope this helps :)

Dean Vollebregt
Dean Vollebregt
24,583 Points

Thank you JT. I was loosing my mind.

Laura Owens
Laura Owens
15,044 Points

Thank you for the help!

I was confused as to where I put those lines of code, but here's what worked for me in case anyone in the future needs more help:

Change ==> Console console = System.console(); To This ==> Scanner userInput = new Scanner*System.in);

Change ==> String zipCode = console.readLine("Enter your zipcode: "); To This ==> System.out.print("Enter your zipcode: "); String zipCode = userInput.nextLine();

I'm only halfway through the video, but this got my initial code to work.

Andre Kucharzyk
Andre Kucharzyk
4,479 Points
Andre Kucharzyk
Andre Kucharzyk
4,479 Points

JT Keller Thank you for that unrequested help :) Do you know by any chance why System.console() returns a null inside of IDE?

Laura Owens
Laura Owens
15,044 Points

My class mentor told me because there is no console in the IDE ???

Stephen Massey
Stephen Massey
2,143 Points
Stephen Massey
Stephen Massey
2,143 Points

Thanks Laura and Andre, I'm using IDE as well and this was frustrating.