从jmenuitem动作监听器获得工作中心

Question

我的About Frame类有问题。我通过action listener中的JMenuItem来调用它。它出现但它没有显示它居中，框架没有按我的要求显示图标图像。我有图标在大型机中工作，所以图像大小不是问题。这是否与private JPanel contentPane;？

有关

JmenuItem中的代码：

aboutMItem.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(ActionEvent e) {
jAboutMN_actionPerformed(e);

关于框架代码：

import java.awt.BorderLayout;
import java.awt.EventQueue;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.swing.JLabel;
import javax.swing.SwingConstants;
import java.awt.Font;
import java.awt.GridLayout;
import javax.swing.BoxLayout;


public class AboutFrame extends JFrame {



private JPanel contentPane;

public static void main(String[] args) {
    EventQueue.invokeLater(new Runnable() {
        public void run() {
            try {
                AboutFrame frame = new AboutFrame();
                frame.setIconImage(new ImageIcon("resources/Image.png").getImage());
                frame.setVisible(true);

                //frame.setLocationRelativeTo(null);
                frame.setLocationRelativeTo(null);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    });
}

public AboutFrame() {
    setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);

    //AboutFrame.setLocationRelativeTo(null); 
    setTitle("About MyAPP");
    setBounds(100, 100, 370, 250);
    //contentPane.setLocationRelativeTo(null);

    contentPane = new JPanel();
    contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
    setContentPane(contentPane);
    contentPane.setLayout(null);


    JLabel lbVerNum = new JLabel("MYAPP,  Beta 1.2");
    lbVerNum.setBounds(57, 11, 233, 19);
    lbVerNum.setVerticalAlignment(SwingConstants.TOP);
    lbVerNum.setFont(new Font("Tahoma", Font.BOLD, 15));
    lbVerNum.setHorizontalAlignment(SwingConstants.CENTER);
    contentPane.add(lbVerNum);

    JLabel lbCopyright = new JLabel("Copyright 2015 ");
    lbCopyright.setBounds(86, 41, 170, 16);
    lbCopyright.setIcon(null);
    lbCopyright.setFont(new Font("Tahoma", Font.PLAIN, 13));
    lbCopyright.setVerticalAlignment(SwingConstants.TOP);
    lbCopyright.setHorizontalAlignment(SwingConstants.CENTER);
    contentPane.add(lbCopyright);


}
}