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LeapYearGUI.java
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LeapYearGUI.java
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import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
class LeapYearGUI extends JFrame implements ActionListener{
JButton ok;
JLabel yearLabel;
JTextField yearField;
static int year;
static boolean notInt;
LeapYearGUI(){
super("Find the leap year");
setExtendedState(JFrame.MAXIMIZED_BOTH);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel pane=new JPanel();
yearField= new JTextField(4);
yearLabel= new JLabel("Enter a year");
ok= new JButton("OK");
ok.setBackground(Color.BLUE);
ok.addActionListener(this);
pane.add(yearLabel);
pane.add(yearField);
pane.add(ok);
add(pane);
pack();
setVisible(true);
}
public void actionPerformed(ActionEvent evt){
Object source=evt.getSource();
if (source == ok){
String input;
input=yearField.getText();
checkNumber(input);
if ((notInt==false)&&(year==0)){
JOptionPane.showMessageDialog(null, "Please enter a valid number", "Error", JOptionPane.ERROR_MESSAGE);
yearField.setText("");
notInt=false;
year=0;
}
else if ((year>0)&&(year%4==0))
{
JOptionPane.showMessageDialog(null, "Year"+" "+year+" "+"is a leap year", "Answer", JOptionPane.PLAIN_MESSAGE);
yearField.setText("");
notInt=false;
year=0;
}
else if((year>0)&&(year%4!=0))
{
JOptionPane.showMessageDialog(null, "Year"+" "+year+" "+"is a not leap year", "Answer", JOptionPane.PLAIN_MESSAGE);
yearField.setText("");
notInt=false;
year=0;
}
}
repaint();
}
void checkNumber(String x){
try{
year=Integer.parseInt(x);
}
catch(NumberFormatException nfe){
JOptionPane.showMessageDialog(null, "Please enter a valid number", "Error", JOptionPane.ERROR_MESSAGE);
yearField.setText("");
notInt=true;
year=0;
}
}
void setLookAndFeel() {
try{
UIManager.setLookAndFeel("com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel");
SwingUtilities.updateComponentTreeUI(this);
}
catch (Exception exc) {
System.err.println("Couldn't use the system "+"look and feel:"+exc);
}
}
public static void main(String[] args){
LeapYearGUI lygui=new LeapYearGUI();
lygui.setLookAndFeel();
}
}