If, elseIf, else statement block.

Question

How would you test whether a radiobutton is selected or not?
if ( lineButton.Selected == true ){ 
s[ 0 ].move( move, move );;
else {
System.out.println("wasn't selected");
Keeps saying cannot find symbol - variable lineButton.
My best guess. If anyone could point out how to access the state of the button for using in this if, I would appreciate it.

Answer 1

i think i understand what is meant by the code you posted. It asks if the radiobutton is selected, and if so, then performs the statements.
I tried to use it, hopefully properly but still get the same error.
Here is the code:
import java.awt.*;
import java.applet.*;
import java.awt.event.*;
import javax.swing.*;
public class Ch09Sample extends Applet implements ActionListener
    // Members
    private Button moveButton = new Button( "Move" );
    private TextField moveText = new TextField( "5" );
    private TextField moveText2 = new TextField( "5" );
    private int move = 0;
    private Shape [] s = new Shape[ 4 ];;
    private MyCanvas canvas = new MyCanvas();
    static String lineString = "Line";
    static String rectangleString = "Rectangle";
    static String circleString = "Circle";
    static String ovalString = "Oval";
    // An inner class
    class MyCanvas extends Canvas
        public void paint(Graphics g)
            for( int k = 0; k < s.length; k++ )
                s[ k ].draw( g );
    public void init()
        // Construct the shapes
        s[0] = new Line( 50, 80, 100, 110, Color.red ); 
        s[1] = new Circle( new Point( 30, 180 ), 20, Color.green );
        s[2] = new Oval( new Point( 150, 50 ), Color.blue );
        //s[3] = new Rectangle( );
        // Set the background color
        this.setBackground( Color.white );
        // Create the user interface
        Panel p1 = new Panel();
        p1.setLayout( new FlowLayout() );
        p1.setBackground( Color.white );
        Label label1 = new Label( "Moves in X:" );
        p1.add( label1 );
        p1.add( moveText );
        Label label2 = new Label( "Moves in Y:" );
        p1.add( label2 );
        p1.add( moveText2 );
        p1.add( moveButton );
        JRadioButton lineButton = new JRadioButton(lineString);
        lineButton.setMnemonic(KeyEvent.VK_B);
        lineButton.setActionCommand(lineString);
        lineButton.setSelected(true);
        JRadioButton rectangleButton = new JRadioButton(rectangleString);
        rectangleButton.setMnemonic(KeyEvent.VK_C);
        rectangleButton.setActionCommand(rectangleString);
        JRadioButton circleButton = new JRadioButton(circleString);
        circleButton.setMnemonic(KeyEvent.VK_D);
        circleButton.setActionCommand(circleString);
        JRadioButton ovalButton = new JRadioButton(ovalString);
        ovalButton.setMnemonic(KeyEvent.VK_R);
        ovalButton.setActionCommand(ovalString);
        ButtonGroup group = new ButtonGroup();
        group.add(lineButton);
        group.add(rectangleButton);
        group.add(circleButton);
        group.add(ovalButton);
        moveButton.addActionListener( this );
        lineButton.addActionListener(this);
        rectangleButton.addActionListener(this);
        circleButton.addActionListener(this);
        ovalButton.addActionListener(this);
        p1.add( lineButton );
        p1.add( rectangleButton );
        p1.add( circleButton );
        p1.add( ovalButton );
        setLayout( new BorderLayout() );
        add( "North", p1 );
        add( "Center", canvas );
        // An instance method
    public void moveDraw()
        // Get the user's input
        move = Integer.parseInt( moveText.getText() ); 
        // Move the shapes polymorphically
        for ( int k= 0; k < s.length; k++ ) 
            s[ k ].move( move, move );  
       if(lineButton.isSelected()) {
          s[ 0 ].move( move, move );;
          } else {
            System.out.println("wasn't selected");
        // Repaint the canvas
        canvas.repaint();
    public void actionPerformed( ActionEvent e )
        // Move the shapes and repaint the canvas
        moveDraw();
}