Red line under “append” while using program in java

Asked By Warren Donaldson 0 points N/A Posted on - 07/21/2012

Hello friends,

I am writing a program in java. The screenshot of the program is as follows:

The method append (string) is undefined for the JTextFeild

As you can see above I get a red line under "append". Why is that so? I have observed that I always get it, when I use a jtext field. When I use the jtext area instead of the field, it is resolved.

Why is this so? Can anyone please guide me how to get rid of this error?

Waiting for your replies.

Kindest regards.

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• Question Category: Java

Best Answer by Agail etthan

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Answered By Fosso pradha 0 points N/A #151031

Red line under “append” while using program in java

 

Dear User,

You should read the API (Application Programming Interface). By looking at the API you can see if there is such a method there for that class. If it doesn’t have, then you simply can’t use it .

Thank you

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• Posted on - 08/03/2012
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Answered By Agail etthan 0 points N/A #151032

Red line under “append” while using program in java

Hi Warren,

That error occurs because you cannot use that method using a jtextfield since it can only support single line of text. So basically it will only work in the jtextarea instead.

I would suggest, you read the API or the Application Programming Interface so that it will help you develop, learn and understand a program easily.

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• Posted on - 11/29/2012
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Answered By Eville bandler 5 points N/A #151033

Red line under “append” while using program in java

 

Hi Warren Donaldson,

Always try to avoid appending your characters in “StringBuffer.append”. As you’ve mentioned in problem, this will put a red line under "append". Instead of that you can use the following code “strBuffer.append('a'); //. This is the same process in jTextfieldImg.append. Use ‘n’ instead of “n”. Hope this solves your issue.

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• Posted on - 12/02/2012
• Question Category: Java