Java Swing.从JButton打开一个新的JPanel并使按钮漂亮

我正在尝试构建一个带有2个按钮的主GUI的小程序.一个按钮关闭程序,另一个按钮我打开一个新的JPanel,它将有文本字段等.

我希望能够制作按钮,使它们看起来像普通的应用程序按钮,我想,漂亮和正方形,相同的大小等等,我不知道如何做到这一点.

此外,我不确定如何通过按钮单击打开新的JFrame.

GUI代码:

package practice;

public class UserInterface extends JFrame {

    private JButton openReportSelection = new JButton("Open new Window");
    private JButton closeButton = new JButton("Close Program");

    private JButton getCloseButton() {
        return closeButton;
    }

    private JButton getOpenReportSelection() {
        return openReportSelection;
    }

    public UserInterface() {
        mainInterface();

    }

    private void mainInterface() {
        setTitle("Program Information Application");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        JPanel centerPanel = new JPanel(new GridLayout(0, 3));

        centerPanel.add(openReportSelection);
        centerPanel.add(closeButton);
        getCloseButton().addActionListener(new Listener());
        add(centerPanel, BorderLayout.CENTER);
        setSize(1000, 200);
        setVisible(true);
    }

    private void addReportPanel() {
        JPanel reportPanel = createNewPanel();
        getContentPane().add(reportPanel, BorderLayout.CENTER);

    }

    private JPanel createNewPanel() {
        JPanel localJPanel = new JPanel();
        localJPanel.setLayout(new FlowLayout());
        return localJPanel;
    }

}

ActionListener类代码:

package practice;

import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;

public class Listener implements ActionListener {


    public void actionPerformed(ActionEvent ae) {       
           System.exit(0);
    }    



}

编辑:我认为打开一个新的JPanel将是一种方式,而不是一个JFrame.从Jbutton点击这样做的最佳方法是什么？