JButton未显示在JFrame中

Question

    if(compressedImageFilePath.exists()){
                    final String ie = Integer.toString(i);
                    JFrame mboxFrame1 = new JFrame("Optimized Image");
                    Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
                    ImageIcon image1 = new ImageIcon(compressedImageFile);
                    JLabel reader1 = new JLabel(image1);
                    mboxFrame1.setContentPane(reader1);
                    controlPanel2 = new JPanel();
                    JButton saveButton = new JButton("SAVE");
                    saveButton.setVisible(true);
                    mboxFrame1.setSize(screenSize.width, screenSize.height-30);
                    mboxFrame1.setResizable(true);
                    mboxFrame1.setVisible(true);
                    mboxFrame1.add(headerLabel);
                    mboxFrame1.add(controlPanel2);
                    controlPanel2.add(saveButton);
                    mboxFrame1.add(controlPanel2, BorderLayout.WEST);
     }

Here i am checking for a particular file. If that file exists i am creating a new Jrame and adding the Save Button to it. But the save button is not getting displayed.Where am i going wrong?

Answer 1

Please add your panel to frame. Hope that will solve the problem

Answer 2

You can try

mboxFrame1.getContentPane().add(reader1,BorderLayout.NORTH);

instead of

mboxFrame1.setContentPane(reader1);

Answer 3

you don't add the JPanel you added the button to to the Jframe in any way. use a layout on your jframe and add the JPanel to the layout. easy to use is BorderLayout