Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

Java Java Data Structures - Retired Exploring the Java Collection Framework Maps

Thomas Williams
Thomas Williams
9,447 Points
Posted by Thomas Williams
Thomas Williams
9,447 Points

KeySet Error in the java-repl

This code when typed into the java-repl:

'''java> Set<String> allAcronyms = acronyms.KeySet();'''

is producing this error:

'''ERROR: cannot find symbol
symbol: method KeySet()
location: variable acronyms of type java.util.Map<java.lang.String,java.lang.String>
acronyms.KeySet();; '''

Even though it is the same as that typed in the tutorial video. Any explanations??

1 Answer

James Simshaw
James Simshaw
28,738 Points

Hello,

It looks like you're trying to call the keySet() method, so double check your capitalization and it should start working.

Thomas Williams
Thomas Williams
9,447 Points
Thomas Williams
Thomas Williams
9,447 Points

Thank you, I thought it looked like a capital, my mistake! That has fixed the problem.

James Simshaw
James Simshaw
28,738 Points

You're welcome. Good luck with Java.