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JTextArea Components: multi-line text area

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• The JTextArea component
  • A text area is a multi line buffer that can used for input or output

  • The swing class that implement text area objects is:

    JTextArea

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  • A text field is created as follows:

    JTextArea x = new JTextArea(); or JTextArea x = new JTextArea( #rows, #columns );

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• Using a JTextArea object
  • To make a JTextArea non-editable (output only):

    JTextAreaObjVar.setEditable( false );

    To make a JTextArea editable (suitable for input ):

    JTextAreaObjVar.setEditable( true );

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  • To clear the JTextArea:

    JTextAreaObjVar.setText("");

    To append (= add) some text (e.g.: "ABC") to the JTextArea:

    JTextAreaObjVar.append("ABC");

    To start a new line in the JTextArea:

    JTextAreaObjVar.append("\n"); // "\n" is the newline character

    To read the (entire) string stored in the text field :

    String s = JTextAreaObjVar.getText( );

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  • Example: using a JTextArea for output:

    import java.awt.*; import javax.swing.*; public class TextArea { public static void main(String[] args) { JFrame f = new JFrame("My GUI"); JTextArea x; x = new JTextArea(); // Make a JTextArea f.getContentPane().add(x); // Stick x.setEditable(true); // Output only x.setText(""); // Clear text area x.append("Hello World\n"); x.append("Hello Again\n"); f.setSize(400, 300); f.setVisible(true); } }

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  • Example Program: (Demo above code)                                                
    • Prog file: click here