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Components: single line text field

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• The JTextField component
  • A text field is a single line buffer that can used for input or output

  • The swing class that implement text field objects is:

    JTextField

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  • Creating a text field object:

    JTextField x = new JTextField(); or: JTextField x = new JTextField( #columns );

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• Using a JTextField for output
  • Output fields must not allow editing

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  • To make a TextField non-editable (output only):

    JTextFieldObjVar.setEditable( false );

    To make a TextField editable (suitable for input ):

    JTextFieldObjVar.setEditable( true );

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  • To write the string "ABC" in the text field :

    JTextFieldObjVar.setText("ABC");

    To read the string stored in the text field :

    String s = JTextFieldObjVar.getText( );

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  • Example: Using JTextField for output:

    import java.awt.*; import javax.swing.*; public class TextField { public static void main(String[] args) { JFrame f = new JFrame("My GUI"); JTextField x; x = new JTextField(); // Make a JTextField f.getContentPane().add(x); // Stick x.setEditable(false); // Output only x.setText("Hello World"); f.setSize(400, 300); f.setVisible(true); } }

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