📄 firstswingapplication.java
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import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class FirstSwingApplication {
public static void main(String args[]) {
JFrame F = new JFrame("Swing application");
JButton button1 = new JButton("Hello Swing application!");
button1.setBackground(Color.green);
F.getContentPane().add(button1, BorderLayout.CENTER);
F.pack();
F.show();
F.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
}
}
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