// MyWindow.java
// Class definition
// Practice with anonymous inner classes, JFrame, windows, WindowAdapter
import java.text.DecimalFormat;
import java.awt.event.*;
import java.awt.*;
import javax.swing.*;

public class MyWindow extends JFrame implements ActionListener {
	DecimalFormat precision2 = new DecimalFormat( "0.00" );
	public double length, width;
	public JLabel lengthLabel, widthLabel, areaLabel;
	public JTextField lengthField, widthField, areaField;
	Container c;

	// constructor
	public MyWindow( ) {
		super ( "Anonymous Inner Class Practice" );

		c = getContentPane( );
		c.setLayout( new FlowLayout( ) );
		lengthLabel = new JLabel( "Enter the length:" );
		lengthField = new JTextField( 10 );
		lengthField.addActionListener( this);
		c.add( lengthLabel );
		c.add( lengthField );

		widthLabel = new JLabel( "Enter the width:" );
		widthField = new JTextField( 10 );
		widthField.addActionListener( this );
		c.add( widthLabel );
		c.add( widthField );

		areaLabel = new JLabel( "Area of the rectangle" );
		areaField = new JTextField( 10 );
		areaField.setEditable( false );
		c.add( areaLabel );
		c.add( areaField );
	}

	public void actionPerformed( ActionEvent e ) {
		length = Double.parseDouble( lengthField.getText( ) );
		width = Double.parseDouble( widthField.getText( ) );
		areaField.setText( precision2.format( length*width ) );
	}

	public void addALabel( JLabel l ) {
		c.add( l );
	}

	public void addAField( JTextField tf ) {
		c.add( tf );
	}
}