staulkor

//Calculator.javapackage Calculator;import java.awt.Toolkit;import javax.swing.SwingUtilities;import javax.swing.UIManager;import java.awt.Dimension;public class Calculator {    boolean packFrame = false;    public Calculator() {        CalcGUI frame = new CalcGUI();        if (packFrame) {            frame.pack();        } else {            frame.validate();        }        // Center the window        Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();        Dimension frameSize = frame.getSize();        if (frameSize.height > screenSize.height) {            frameSize.height = screenSize.height;        }        if (frameSize.width > screenSize.width) {            frameSize.width = screenSize.width;        }        frame.setLocation((screenSize.width - frameSize.width) / 2,                          (screenSize.height - frameSize.height) / 2);        frame.setVisible(true);    }    public static void main(String[] args) {        SwingUtilities.invokeLater(new Runnable() {            public void run() {                try {                    UIManager.setLookAndFeel(UIManager.                                             getSystemLookAndFeelClassName());                } catch (Exception exception) {                    exception.printStackTrace();                }                new Calculator();            }        });    }}