Cannot find symbol method append in java netbeans

Question

0.00/5 (No votes)

See more:

Cannot find symbol method append in java netbeans
what could be the problem

Java

try {
    String msg = dis.readUTF();
    txt_recMsg.append("\n"+msg);
} catch (IOException ex) {
    Logger.getLogger(ClientForm.class.getName()).log(Level.SEVERE, null, ex);
}

Posted 10-Jun-14 23:26pm

kami124

Updated 13-Feb-20 5:11am

Richard MacCutchan

v2

Add a Solution

2 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

norbitrial · Answer 1 · 2014-06-11T00:20:00

Solution 1

Probably this caused by backslash in your string. You can solve as follows (double backslash):

Java

try {
String msg = dis.readUTF();
String oldText = txt_recMsg.getText();

StringBuilder yourStringBuilder = new StringBuilder();
yourStringBuilder.append(oldText);
yourStringBuilder.append("\\n");
yourStringBuilder.append(msg);

txt_recMsg.setText(yourStringBuilder.toString());
} catch (IOException ex) {
Logger.getLogger(ClientForm.class.getName()).log(Level.SEVERE, null, ex);
}

I've updated the code with adding StringBuilder. It has better performance and you can invoke append to StringBuilder. After your textField could be updated with setText method.

You can read more String vs. StringBuilder performace from here[^]!

Let me know if it works or not!

Posted 11-Jun-14 0:20am

norbitrial

Updated 11-Jun-14 1:04am

v5

Comments

kami124 11-Jun-14 6:25am

Still same problem, problem some where in txt_recMsg

norbitrial 11-Jun-14 6:30am

Is txt_recMsg a textfield or textbox? Have you declared txt_recMsg before you wanted to invoke append method?

kami124 11-Jun-14 6:34am

its textfield. first i create txt_recMsg and then invoke append method

norbitrial 11-Jun-14 6:56am

I've improved my solution with StringBuilder for better performance and setText method in order to change the value of your textField.

kami124 11-Jun-14 7:15am

Perfect its working

joxb 20-Sep-19 14:20pm

Where should I put this text? I'm kind of new to coding so I don't really understand.

Richard MacCutchan · Answer 2 · 2014-06-11T00:27:00

Solution 2

You have not declared the variable txt_recMsg in the above code. But assuming it is a string, then there is no append method, as the documentation[^] shows. You need to use the StringBuffer class[^].

Posted 11-Jun-14 0:27am

Richard MacCutchan

Comments

kami124 11-Jun-14 6:36am

its declared its textfield