Java tehtäviä perusteet vastaus3

Mureakuha

Tehtävä:

Kirjoita ohjelma, jossa on kaksi JCheckBox ja JRadioButton tyylin kontrollia. Näiden tila tutkitaan painettaessa kyseisiä painonappeja ja tulos tulostetaan JLabel-luokan kontrolleihin.

CheckboxFrame.java

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.*;
 
/**
 * Ikkunaluokka.
 */
public class CheckboxFrame extends JFrame
{
  private JRadioButton radioButton1 = new JRadioButton();
  private JRadioButton radioButton2 = new JRadioButton();
  private JButton radioButton = new JButton();
  private JCheckBox checkbox1 = new JCheckBox();
  private JCheckBox checkbox2 = new JCheckBox();
  private JButton checkboxButton = new JButton();
  private JLabel label1 = new JLabel();
  private JLabel label2 = new JLabel();
  private JLabel label3 = new JLabel();
 
  /**
   * Konstruktori.
   */
  public CheckboxFrame()
  {
    JPanel panel = new JPanel();
    panel.setLayout( new GridBagLayout() );
 
    JPanel contentPane = ( JPanel ) getContentPane();
    Border border = BorderFactory.createEtchedBorder( Color.white, new Color( 134, 134, 134 ) );
    contentPane.setLayout( new GridBagLayout() );
    setResizable( false );
    setSize( new Dimension( 400, 300 ) );
    setTitle( "CheckBox & RadioButton" );
    setDefaultCloseOperation( WindowConstants.DISPOSE_ON_CLOSE );
 
    radioButton1.setSelected( true );
    radioButton1.setText( "RadioButton1" );
    radioButton2.setText( "RadioButton2" );
    radioButton.setText( "Radio" );
    radioButton.addActionListener( new java.awt.event.ActionListener()
    {
      public void actionPerformed( ActionEvent e )
      {
        radioButton_actionPerformed( e );
      }
    } );
 
    checkbox1.setText( "CheckBox1" );
    checkbox2.setText( "CheckBox2" );
    checkboxButton.setText( "Check" );
    checkboxButton.addActionListener( new java.awt.event.ActionListener()
    {
      public void actionPerformed( ActionEvent e )
      {
        checkboxButton_actionPerformed( e );
      }
    } );
 
    label1.setBorder( border );
    label1.setText( " " );
    label2.setBorder( border );
    label2.setText( " " );
    label3.setBorder( border );
    label3.setText( " " );
 
    contentPane.add( panel, new GridBagConstraints( 1, 0, 1, 1, 1.0, 1.0
        , GridBagConstraints.CENTER, GridBagConstraints.BOTH, new Insets( 0, 2, 0, 0 ), 0, 201 ) );
    panel.add( radioButton1, new GridBagConstraints( 1, 0, 1, 1, 0.0, 0.0
        , GridBagConstraints.CENTER, GridBagConstraints.NONE, new Insets( 0, 0, 0, 0 ), 0, 0 ) );
    panel.add( radioButton2, new GridBagConstraints( 1, 1, 1, 1, 0.0, 0.0
        , GridBagConstraints.CENTER, GridBagConstraints.NONE, new Insets( 0, 40, 0, 40 ), 0, 0 ) );
    panel.add( radioButton, new GridBagConstraints( 1, 2, 1, 1, 0.0, 0.0
        , GridBagConstraints.CENTER, GridBagConstraints.NONE, new Insets( 20, 0, 0, 0 ), 0, 1 ) );
    panel.add( checkbox1, new GridBagConstraints( 0, 0, 1, 1, 0.0, 0.0
                                                  , GridBagConstraints.CENTER, GridBagConstraints.NONE,
                                                  new Insets( 0, 0, 0, 0 ), 0, 0 ) );
    panel.add( checkbox2, new GridBagConstraints( 0, 1, 1, 1, 0.0, 0.0
                                                  , GridBagConstraints.CENTER, GridBagConstraints.NONE,
                                                  new Insets( 0, 40, 0, 40 ), 0, 0 ) );
    panel.add( checkboxButton, new GridBagConstraints( 0, 2, 1, 1, 0.0, 0.0
        , GridBagConstraints.CENTER, GridBagConstraints.NONE, new Insets( 20, 0, 0, 0 ), 0, 0 ) );
    panel.add( label1, new GridBagConstraints( 0, 3, 1, 1, 0.0, 0.0
                                               , GridBagConstraints.CENTER, GridBagConstraints.HORIZONTAL,
                                               new Insets( 10, 0, 0, 0 ), 80, 0 ) );
    panel.add( label2, new GridBagConstraints( 0, 4, 1, 1, 0.0, 0.0
                                               , GridBagConstraints.CENTER, GridBagConstraints.HORIZONTAL,
                                               new Insets( 10, 0, 0, 0 ), 0, 0 ) );
    panel.add( label3, new GridBagConstraints( 1, 4, 1, 1, 0.0, 0.0
                                               , GridBagConstraints.CENTER, GridBagConstraints.HORIZONTAL,
                                               new Insets( 10, 0, 0, 0 ), 0, 0 ) );
 
    ButtonGroup buttonGroup = new ButtonGroup();
    buttonGroup.add( radioButton1 );
    buttonGroup.add( radioButton2 );
  }
 
  /**
   * Radiopainikkeiden tutkinen.
   * @param e tapahtuman tarkempi kuvaus
   */
  void radioButton_actionPerformed( ActionEvent e )
  {
    if ( radioButton1.isSelected() )
      label3.setText( "Radio1 päällä" );
    else
      label3.setText( "Radio2 päällä" );
  }
 
  /**
   * Checkboxien tutkinen.
   * @param e tapahtuman tarkempi kuvaus
   */
  void checkboxButton_actionPerformed( ActionEvent e )
  {
    if ( checkbox1.isSelected() )
      label1.setText( "Check1 päällä" );
    else
      label1.setText( "Check1 pois" );
 
    if ( checkbox2.isSelected() )
      label2.setText( "Check2 päällä" );
    else
      label2.setText( "Check2 pois" );
  }
 
}

CheckboxApp.java

import javax.swing.UIManager;
import java.awt.*;
 
/**
 * Varsinainen ohjelma.
 */
public class CheckboxApp
{
  /**
   * Luo ja rakentaa ohjelman.
   */
  public CheckboxApp()
  {
    CheckboxFrame frame = new CheckboxFrame();
    frame.validate();
 
    // keskittää ohjelman ruudun keskelle
    Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
    Dimension frameSize = frame.getSize();
    if ( frameSize.height > screenSize.height )
      frameSize.height = screenSize.height;
 
    if ( frameSize.width > screenSize.width )
      frameSize.width = screenSize.width;
 
    frame.setLocation( ( screenSize.width - frameSize.width ) / 2, ( screenSize.height - frameSize.height ) / 2 );
 
    // näyttää ohjelman
    frame.setVisible( true );
  }
 
  /**
   * Main-metodi.
   * @param args käynnistysparametrit
   */
  public static void main( String[] args )
  {
    try
    {
      UIManager.setLookAndFeel( UIManager.getSystemLookAndFeelClassName() );
    }
    catch ( Exception e )
    {
      e.printStackTrace();
    }
    new CheckboxApp();
  }
}

_{Alkuperäinen (c) Petteri Hämäläinen}