Write a Java application or applet that can display a moving banner cross a wind

Question

Write a Java application or applet that can display a moving banner cross a window or an applet. There will be a text field the user can enter the content of the marques and OK button will send the entered content to display. There will be also a color chooser the user can change the color of the marques, and a combo box or list the user can select the size of fonts for the marques (at least 5 different fonts ranged from 14 to 22). It’s up to you to decide which GUI components you choose to accomplish the color chooser. You may consider using a comb box or list with at least 5 colors to be chosen if you feel difficulty to use JColorChooser. Finally, there will be another button to exit the execution of the program.

Explanation / Answer

import java.awt.*; // Using AWT's containers and components
import java.awt.event.*; // Using AWT's event classes and listener interfaces

// A GUI program inherits the top-level Container java.awt.Frame
public class AWTAccumulator extends Frame implements ActionListener {
private Label lblInput; // Declare input Label
private Label lblOutput; // Declare output Label
private TextField tfInput; // Declare input TextField
private TextField tfOutput; // Declare output display TextField
private int sum = 0; // The accumulated sum, init to 0

// Constructor to setup the UI components and event handlers
public AWTAccumulator() {
setLayout(new FlowLayout()); // "super" Frame sets to FlowLayout

lblInput = new Label("Enter an integer"); // Construct component Label
add(lblInput); // "super" Frame adds the Label

tfInput = new TextField(10); // Construct component TextField
add(tfInput); // "super" Frame adds the TextField

tfInput.addActionListener(this);
// tfInput is a source that fires ActionEvent when entered.
// The source add "this" instance as a ActionEvent listener, which provides
// an ActionEvent handler called actionPerformed().
// Hitting enter on tfInput invokes actionPerformed().

lblOutput = new Label("Accumulated sum is"); // Construct component Label
add(lblOutput); // "super" Frame adds Label

tfOutput = new TextField(10); // Construct component TextField
tfOutput.setEditable(false); // read-only
add(tfOutput); // "super" Frame adds TextField

setTitle("AWT Accumulator"); // "super" Frame sets title
setSize(350, 120); // "super" Frame sets initial size
setVisible(true); // "super" Frame shows
}

// The entry main() method
public static void main(String[] args) {
// Invoke the constructor by allocating an anonymous instance
new AWTAccumulator();
}

// ActionEvent handler - Called back when enter key was hit on TextField.
@Override
public void actionPerformed(ActionEvent evt) {
int numberIn = Integer.parseInt(tfInput.getText());
// Get the String entered, convert to int
sum += numberIn; // Accumulate numbers entered into sum
tfInput.setText(""); // Clear input TextField
tfOutput.setText("" + sum); // Display sum on the output TextField, convert int to String
}
}

Related Questions

Navigate

• Browse (All)
• Browse W
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.