?
Solved

jtextarea gettext

Posted on 2002-07-28
8
Medium Priority
?
1,543 Views
Last Modified: 2012-06-21
I have problem in get the content I fill in a JtextArea,
The followint is my code, why remark is null after I fill in some string?

      textArea.setColumns(15);
      textArea.setRows(3);
      JEditorPane editorPane = new JEditorPane();
      editorPane.add(textArea);
      JScrollPane areaScrollPane = new JScrollPane(editorPane);


      String remark = this.textArea.getText();
      System.out.println("remark = "+remark);
0
Comment
Question by:stanleyhuen
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
8 Comments
 
LVL 92

Expert Comment

by:objects
ID: 7184330
Has any text been entered into the text area?

can I also see all the code for the class.
0
 
LVL 9

Expert Comment

by:Ovi
ID: 7184430

      textArea.setColumns(15);
      textArea.setRows(3);
      textArea.setText("test");
      JEditorPane editorPane = new JEditorPane();
      editorPane.add(textArea);
      JScrollPane areaScrollPane = new JScrollPane(editorPane);


      String remark = this.textArea.getText();
      System.out.println("remark = "+remark);

but anyway why do you add your text area to a JEditorPane ? Why don't you just put'it in the scrollpane?
0
 

Author Comment

by:stanleyhuen
ID: 7184784
The users are allowed to add some text in the text area, so I use JEditorPane, is it correct?
0
Get real performance insights from real users

Key features:
- Total Pages Views and Load times
- Top Pages Viewed and Load Times
- Real Time Site Page Build Performance
- Users’ Browser and Platform Performance
- Geographic User Breakdown
- And more

 
LVL 92

Expert Comment

by:objects
ID: 7184791
You can simply use a JTextArea for that.
A JEditorPane is a more sophisticated text component.
0
 
LVL 9

Expert Comment

by:Ovi
ID: 7184804
As objects said JEditorPane is a more complex text component meening that it can display and edit html content. It's subclass called JTextPane is capable editing/viewing of html, rtf, styled text.

To use just the text area modify to following:

     textArea.setColumns(15);
      textArea.setRows(3);
      textArea.setText("test");
      JScrollPane areaScrollPane = new JScrollPane(textArea);


0
 
LVL 2

Expert Comment

by:macgre
ID: 7185409
I ran a simple test to confirm my what I suspected, the string is not null it is empty there is a difference.

My test code follows:
Frame1 f = new Frame1();
JTextArea ta = new JTextArea(3, 15);
JEditorPane ep = new JEditorPane();
JScrollPane sp = new JScrollPane();

ep.add(ta);
f.getContentPane().add(sp);

String t = ta.getText();

System.out.println("Text: " + ((t==null)?"IS NULL": t));

The output was:
'Text: '
0
 
LVL 3

Expert Comment

by:yasser_helmy
ID: 7185686
The JTextArea.getText() method never returns null If the text area is empty, it returns an empty string "".
Are you sure some text is in the text area before the call to getText()? Does any thread change the text area contents?
Make sure there are no calls to setText("") before the getText();
0
 
LVL 9

Accepted Solution

by:
Ovi earned 800 total points
ID: 7187147
Try this :

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class test extends JFrame {
  JTextArea textArea;
  JButton put;
  JButton get;

  public test() {
    initTest();
    setListaners();
  }

  protected void initTest() {
    Container c = getContentPane();
    c.setLayout(new BorderLayout());
    textArea = new JTextArea();
    put = new JButton("Put text");
    get = new JButton("Get text");
    c.add(new JScrollPane(textArea), BorderLayout.CENTER);
    JPanel p = new JPanel();
    p.add(put);
    p.add(get);
    c.add(p, BorderLayout.SOUTH);
  }
 
  protected void setListeners() {
    put.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent ae) {
        textArea.append("New content inserted.\n");
      }
    });
    get.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent ae) {
        System.out.println("---------------------");
        System.out.println("Curent content : " + textArea.getText());
        System.out.println("---------------------");
      }
    });
  }

  public static void main(String[] args) {
    test t = new test();
    t.setSize(200, 300);
    t.setLocation(200, 100);
    t.setVisible(true);
  }
}
0

Featured Post

Get 15 Days FREE Full-Featured Trial

Benefit from a mission critical IT monitoring with Monitis Premium or get it FREE for your entry level monitoring needs.
-Over 200,000 users
-More than 300,000 websites monitored
-Used in 197 countries
-Recommended by 98% of users

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Java contains several comparison operators (e.g., <, <=, >, >=, ==, !=) that allow you to compare primitive values. However, these operators cannot be used to compare the contents of objects. Interface Comparable is used to allow objects of a cl…
Go is an acronym of golang, is a programming language developed Google in 2007. Go is a new language that is mostly in the C family, with significant input from Pascal/Modula/Oberon family. Hence Go arisen as low-level language with fast compilation…
Viewers will learn about the different types of variables in Java and how to declare them. Decide the type of variable desired: Put the keyword corresponding to the type of variable in front of the variable name: Use the equal sign to assign a v…
This tutorial explains how to use the VisualVM tool for the Java platform application. This video goes into detail on the Threads, Sampler, and Profiler tabs.
Suggested Courses
Course of the Month15 days, 6 hours left to enroll

741 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question