java中使窗口居中显示

如果要使主窗口 居中一般使用下面的方法：
import javax.swing.*;
import java.awt.*;
public class ToCenter
{
  public ToCenter(JFrame frame)
   {
       //---------------------------设置窗口居中----------------------------------------------------------
        int windowWidth = frame.getWidth();                     //获得窗口宽
        int windowHeight = frame.getHeight();                   //获得窗口高
         Toolkit kit = Toolkit.getDefaultToolkit();              //定义工具包
         Dimension screenSize = kit.getScreenSize();             //获取屏幕的尺寸
        int screenWidth = screenSize.width;                     //获取屏幕的宽
        int screenHeight = screenSize.height;                   //获取屏幕的高
         frame.setLocation(screenWidth/2-windowWidth/2, screenHeight/2-windowHeight/2);//设置窗口居中显示
         //------------------------------------------------------------------------------------------------
   }
}
当然你也可以让一个Window对象、JWindow对象或Frame对象居中，以下是更通用的方法：
      Toolkit kit = Toolkit.getDefaultToolkit();&