textField1 s 60 61 62 user pressed Enter in JTextField textField2 63 else if 64

Textfield1 s 60 61 62 user pressed enter in

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"textField1: %s" , 60 ); 61 62 // user pressed Enter in JTextField textField2 63 else if ( ) 64 string = String.format( "textField2: %s" , 65 ); 66 67 // user pressed Enter in JTextField textField3 68 else if ( ) 69 string = String.format( "textField3: %s" , 70 ); 71 72 // user pressed Enter in JTextField passwordField 73 else if ( ) 74 string = String.format( "passwordField: %s" , 75 ); 76 77 // display JTextField content 78 JOptionPane.showMessageDialog( null , string ); 79 } // end method actionPerformed 80 } // end private inner class TextFieldHandler 81 } // end class TextFieldFrame Fig. 14.9 | JTextFields and JPasswordFields . (Part 2 of 2.) // construct textfield with default text and 21 columns textField3 = new JTextField( "Uneditable text field" , 21 ); textField3.setEditable( false ); // disable editing passwordField = new JPasswordField( "Hidden text" ); TextFieldHandler handler = new TextFieldHandler(); textField1.addActionListener( handler ); textField2.addActionListener( handler ); textField3.addActionListener( handler ); passwordField.addActionListener( handler ); private class TextFieldHandler implements ActionListener public void actionPerformed( ActionEvent event ) event.getSource() == textField1 event.getActionCommand() event.getSource() == textField2 event.getActionCommand() event.getSource() == textField3 event.getActionCommand() event.getSource() == passwordField event.getActionCommand()
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564 Chapter 14 GUI Components: Part 1 Creating the GUI Line 22 sets the TextFieldFrame ’s layout to FlowLayout . Line 25 creates textField1 with 10 columns of text. A text column’s width in pixels is determined by the average width of a character in the text field’s current font. When text is displayed in a text field and the text is wider than the field itself, a portion of the text at the right side is not visible. If you’re typing in a text field and the cursor reaches the right edge, the text at the left edge is pushed off the left side of the field and is no longer visible. Users can use the left and right arrow keys to move through the complete text. Line 26 adds textField1 to the JFrame . Line 29 creates textField2 with the initial text "Enter text here" to display in the text field. The width of the field is determined by the width of the default text specified in the constructor. Line 30 adds textField2 to the JFrame . Line 33 creates textField3 and calls the JTextField constructor with two argu- ments—the default text "Uneditable text field" to display and the text field’s width in columns ( 21 ). Line 34 uses method setEditable (inherited by JTextField from class JTextComponent ) to make the text field uneditable —i.e., the user cannot modify the text in the field. Line 35 adds textField3 to the JFrame . Line 38 creates passwordField with the text "Hidden text" to display in the text field. The width of the field is determined by the width of the default text. When you exe- cute the application, notice that the text is displayed as a string of asterisks. Line 39 adds passwordField to the JFrame .
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