📄 elevator.java
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// Exercise 20.13: Elevator.java
// Application simulates an elevator.
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Elevator extends JFrame
{
// JLabel for elevator JButtons
private JLabel selectFloorJLabel;
// JButtons to select the floor
private JButton oneJButton;
private JButton twoJButton;
private JButton threeJButton;
private JButton fourJButton;
private JButton fiveJButton;
private JButton sixJButton;
private JButton sevenJButton;
private JButton eightJButton;
private JButton nineJButton;
// JTextArea for displaying elevator location
public JTextArea displayJTextArea;
// DrawJPanel for displaying rectangles
private DrawJPanel drawingJPanel;
// JLabel for displaying floor sign
private JLabel floorJLabel;
// JLabels for displaying the floor
private JLabel oneJLabel;
private JLabel twoJLabel;
private JLabel threeJLabel;
private JLabel fourJLabel;
private JLabel fiveJLabel;
private JLabel sixJLabel;
private JLabel sevenJLabel;
private JLabel eightJLabel;
private JLabel nineJLabel;
// no-argument constructor
public Elevator()
{
createUserInterface();
}
// create and position GUI components; register event handlers
private void createUserInterface()
{
// get content pane for attaching GUI components
Container contentPane = getContentPane();
// enable explicit positioning of GUI components
contentPane.setLayout( null );
// set up selectFloorJLabel
selectFloorJLabel = new JLabel();
selectFloorJLabel.setBounds( 15, 65, 100, 25 );
selectFloorJLabel.setText( "Select Floor:" );
contentPane.add( selectFloorJLabel );
// set up oneJButton
oneJButton = new JButton();
oneJButton.setBounds( 15, 100, 41, 41 );
oneJButton.setText( "1" );
contentPane.add( oneJButton );
oneJButton.addActionListener(
new ActionListener() // anonymous inner class
{
// event handler called when oneJButton is pressed
public void actionPerformed( ActionEvent event )
{
oneJButtonActionPerformed( event );
}
} // end anonymous inner class
); // end call to addActionListener
// set up twoJButton
twoJButton = new JButton();
twoJButton.setBounds( 75, 100, 41, 41 );
twoJButton.setText( "2" );
contentPane.add( twoJButton );
twoJButton.addActionListener(
new ActionListener() // anonymous inner class
{
// event handler called when twoJButton is pressed
public void actionPerformed( ActionEvent event )
{
twoJButtonActionPerformed( event );
}
} // end anonymous inner class
); // end call to addActionListener
// set up threeJButton
threeJButton = new JButton();
threeJButton.setBounds( 135, 100, 41, 41 );
threeJButton.setText( "3" );
contentPane.add( threeJButton );
threeJButton.addActionListener(
new ActionListener() // anonymous inner class
{
// event handler called when threeJButton is pressed
public void actionPerformed( ActionEvent event )
{
threeJButtonActionPerformed( event );
}
} // end anonymous inner class
); // end call to addActionListener
// set up fourJButton
fourJButton = new JButton();
fourJButton.setBounds( 15, 160, 41, 41 );
fourJButton.setText( "4" );
contentPane.add( fourJButton );
fourJButton.addActionListener(
new ActionListener() // anonymous inner class
{
// event handler called when fourJButton is pressed
public void actionPerformed( ActionEvent event )
{
fourJButtonActionPerformed( event );
}
} // end anonymous inner class
); // end call to addActionListener
// set up fiveJButton
fiveJButton = new JButton();
fiveJButton.setBounds( 75, 160, 41, 41 );
fiveJButton.setText( "5" );
contentPane.add( fiveJButton );
fiveJButton.addActionListener(
new ActionListener() // anonymous inner class
{
// event handler called when fiveJButton is pressed
public void actionPerformed( ActionEvent event )
{
fiveJButtonActionPerformed( event );
}
} // end anonymous inner class
); // end call to addActionListener
// set up sixJButton
sixJButton = new JButton();
sixJButton.setBounds( 135, 160, 41, 41 );
sixJButton.setText( "6" );
contentPane.add( sixJButton );
sixJButton.addActionListener(
new ActionListener() // anonymous inner class
{
// event handler called when sixJButton is pressed
public void actionPerformed( ActionEvent event )
{
sixJButtonActionPerformed( event );
}
} // end anonymous inner class
); // end call to addActionListener
// set up sevenJButton
sevenJButton = new JButton();
sevenJButton.setBounds( 15, 220, 41, 41 );
sevenJButton.setText( "7" );
contentPane.add( sevenJButton );
sevenJButton.addActionListener(
new ActionListener() // anonymous inner class
{
// event handler called when sevenJButton is pressed
public void actionPerformed( ActionEvent event )
{
sevenJButtonActionPerformed( event );
}
} // end anonymous inner class
); // end call to addActionListener
// set up eightJButton
eightJButton = new JButton();
eightJButton.setBounds( 75, 220, 41, 41 );
eightJButton.setText( "8" );
contentPane.add( eightJButton );
eightJButton.addActionListener(
new ActionListener() // anonymous inner class
{
// event handler called when eightJButton is pressed
public void actionPerformed( ActionEvent event )
{
eightJButtonActionPerformed( event );
}
} // end anonymous inner class
); // end call to addActionListener
// set up nineJButton
nineJButton = new JButton();
nineJButton.setBounds( 135, 220, 41, 41 );
nineJButton.setText( "9" );
contentPane.add( nineJButton );
nineJButton.addActionListener(
new ActionListener() // anonymous inner class
{
// event handler called when nineJButton is pressed
public void actionPerformed( ActionEvent event )
{
nineJButtonActionPerformed( event );
}
} // end anonymous inner class
); // end call to addActionListener
// set up displayJTextArea
displayJTextArea = new JTextArea();
displayJTextArea.setBounds( 16, 290, 170, 20 );
displayJTextArea.setEditable( false );
displayJTextArea.setForeground( Color.RED );
contentPane.add( displayJTextArea );
// set up drawingJPanel
drawingJPanel = new DrawJPanel();
drawingJPanel.setBounds( 215, 50, 150, 450 );
drawingJPanel.setBackground( Color.WHITE );
contentPane.add( drawingJPanel );
// set up floorJLabel
floorJLabel = new JLabel();
floorJLabel.setBounds( 375, 16, 50, 25 );
floorJLabel.setText( "Floor:" );
contentPane.add( floorJLabel );
// set up oneJLabel
oneJLabel = new JLabel();
oneJLabel.setBounds( 385, 460, 25, 25 );
oneJLabel.setText( "1" );
contentPane.add( oneJLabel );
// set up twoJLabel
twoJLabel = new JLabel();
twoJLabel.setBounds( 385, 410, 25, 25 );
twoJLabel.setText( "2" );
contentPane.add( twoJLabel );
// set up threeJLabel
threeJLabel = new JLabel();
threeJLabel.setBounds( 385, 360, 25, 25 );
threeJLabel.setText( "3" );
contentPane.add( threeJLabel );
// set up fourJLabel
fourJLabel = new JLabel();
fourJLabel.setBounds( 385, 310, 25, 25 );
fourJLabel.setText( "4" );
contentPane.add( fourJLabel );
// set up fiveJLabel
fiveJLabel = new JLabel();
fiveJLabel.setBounds( 385, 260, 25, 25 );
fiveJLabel.setText( "5" );
contentPane.add( fiveJLabel );
// set up sixJLabel
sixJLabel = new JLabel();
sixJLabel.setBounds( 385, 210, 25, 25 );
sixJLabel.setText( "6" );
contentPane.add( sixJLabel );
// set up sevenJLabel
sevenJLabel = new JLabel();
sevenJLabel.setBounds( 385, 160, 25, 25 );
sevenJLabel.setText( "7" );
contentPane.add( sevenJLabel );
// set up eightJLabel
eightJLabel = new JLabel();
eightJLabel.setBounds( 385, 110, 25, 25 );
eightJLabel.setText( "8" );
contentPane.add( eightJLabel );
// set up nineJLabel
nineJLabel = new JLabel();
nineJLabel.setBounds( 385, 60, 25, 25 );
nineJLabel.setText( "9" );
contentPane.add( nineJLabel );
// set properties of application's window
setTitle( "Elevator" ); // set title bar text
setSize( 430, 540 ); // set window size
setVisible( true ); // display window
} // end method createUserInterface
// move the elevator to the first floor
private void oneJButtonActionPerformed( ActionEvent event )
{
drawingJPanel.moveElevatorToFloor( 1 ); // move the elevator
// display a message in the displayJTextArea
displayJTextArea.setText( "You are on the FIRST floor" );
} // end method oneJButtonActionPerformed
// move the elevator to the second floor
private void twoJButtonActionPerformed( ActionEvent event )
{
drawingJPanel.moveElevatorToFloor( 2 ); // move the elevator
// display a message in the displayJTextArea
displayJTextArea.setText( "You are on the SECOND floor" );
} // end method twoJButtonActionPerformed
// move the elevator to the third floor
private void threeJButtonActionPerformed( ActionEvent event )
{
drawingJPanel.moveElevatorToFloor( 3 ); // move the elevator
// display a message in the displayJTextArea
displayJTextArea.setText( "You are on the THIRD floor" );
} // end method threeJButtonActionPerformed
// move the elevator to the fourth floor
private void fourJButtonActionPerformed( ActionEvent event )
{
drawingJPanel.moveElevatorToFloor( 4 ); // move the elevator
// display a message in the displayJTextArea
displayJTextArea.setText( "You are on the FOURTH floor" );
} // end method fourJButtonActionPerformed
// move the elevator to the fifth floor
private void fiveJButtonActionPerformed( ActionEvent event )
{
drawingJPanel.moveElevatorToFloor( 5 ); // move the elevator
// display a message in the displayJTextArea
displayJTextArea.setText( "You are on the FIFTH floor" );
} // end method fiveJButtonActionPerformed
// move the elevator to the sixth floor
private void sixJButtonActionPerformed( ActionEvent event )
{
drawingJPanel.moveElevatorToFloor( 6 ); // move the elevator
// display a message in the displayJTextArea
displayJTextArea.setText( "You are on the SIXTH floor" );
} // end method sixJButtonActionPerformed
// move the elevator to the seventh floor
private void sevenJButtonActionPerformed( ActionEvent event )
{
drawingJPanel.moveElevatorToFloor( 7 ); // move the elevator
// display a message in the displayJTextArea
displayJTextArea.setText( "You are on the SEVENTH floor" );
} // end method sevenJButtonActionPerformed
// move the elevator to the eighth floor
private void eightJButtonActionPerformed( ActionEvent event )
{
drawingJPanel.moveElevatorToFloor( 8 ); // move the elevator
// display a message in the displayJTextArea
displayJTextArea.setText( "You are on the EIGHTH floor" );
} // end method eightJButtonActionPerformed
// move the elevator to the ninth floor
private void nineJButtonActionPerformed( ActionEvent event )
{
drawingJPanel.moveElevatorToFloor( 9 ); // move the elevator
// display a message in the displayJTextArea
displayJTextArea.setText( "You are on the NINTH floor" );
} // end method nineJButtonActionPerformed
// main method
public static void main( String[] args )
{
Elevator application = new Elevator();
application.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
} // end method main
} // end class Elevator
/**************************************************************************
* (C) Copyright 1992-2004 by Deitel & Associates, Inc. and *
* Pearson Education, Inc. All Rights Reserved. *
* *
* DISCLAIMER: The authors and publisher of this book have used their *
* best efforts in preparing the book. These efforts include the *
* development, research, and testing of the theories and programs *
* to determine their effectiveness. The authors and publisher make *
* no warranty of any kind, expressed or implied, with regard to these *
* programs or to the documentation contained in these books. The authors *
* and publisher shall not be liable in any event for incidental or *
* consequential damages in connection with, or arising out of, the *
* furnishing, performance, or use of these programs. *
**************************************************************************/⌨️ 快捷键说明
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