这个是朋友作的毕业设计

				package Resource_Selection;								import javax.swing.UIManager;				import java.awt.*;								public class first {				  boolean packFrame = false;								  //Construct the application				  public first() {				    select frame = new select();				    //Validate frames that have preset sizes				    //Pack frames that have useful preferred size info, e.g. from their layout				    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);				  }				  //Main method				  public static void main(String[] args) {				    try {				      UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());				    }				    catch(Exception e) {				      e.printStackTrace();				    }				    new first();				  }				}