Try to remember that even though the answer may be obvious to you, it may not be obvious to others. It is even possible that your intermediate steps may not be obvious - you may need to break them down as well.
Even though you may feel an answer has been provided, you may need to show how friendly you can be by providing further help if required.
And depending on the frustration the original poster is having, you may have to be extra patient and friendly with them.
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HowToAnswerQuestionsOnJavaRanch