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Java Java Data Structures Organizing Data Interfaces

Hello, I wonder why i cant write [] or {} in workspace but works good if i use my own texeditr like textWranglers.

Hello, I wonder why i cant write [] or {} in workspace but works good if i use my own texeditor like textWranglers. I also wonder all the commands you do in workspace where can i learn that? somethimes you are pressing some keys that jumps from java-repl directly to treehouse:-/workspace$