mainframe.java~1~

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package system;

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class MainFrame extends JFrame{
  private static final int WIDTH = 700;
  private static final int HEIGHT = 550;

  public MainFrame(){

  }

  public void show(){
    this.setTitle("--");
    this.setResizable(false);
    this.setSize(this.WIDTH,this.HEIGHT);

    Dimension size = Toolkit.getDefaultToolkit().getScreenSize();
    int width = size.width;
    int height = size.height;
    this.setLocation((width-this.WIDTH)/2,(height-this.HEIGHT)/2);

    super.show();
  }
}