Java Swing JFrame Layout

java swing jframe jbutton layout-manager
DanMatlin picture DanMatlin · Dec 28, 2011 · Viewed 43.2k times · Source

I just wrote a simple code where I want a textfield and a button to appear on the main frame, but after running all I see is the textfield.

If I write the code of the button after the textfield then only the button is displayed.

Any idea why?

    JFrame mainframe=new JFrame();
    mainframe.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    mainframe.setBounds(0,0,200,200);
    JButton jb=new JButton();
    jb.setText("Leech");
    mainframe.add(jb);
    JTextField link=new JTextField(50);
    mainframe.add(link);
    mainframe.pack();
    mainframe.setVisible(true);

Answer

Robin picture Robin · Dec 28, 2011

The default layout on a JFrame is a BorderLayout. Calling the add method on a Container with such a layout is equivalent to a call add(..., BorderLayout.CENTER). Each of the locations of the BorderLayout can contain only one element. Hence making two calls

mainframe.add(jb);
mainframe.add(link);

results in a CENTER containing the last component you added. If you want to avoid this you can either add it to different locations, or use another layout manager (for example a FlowLayout) by calling JFrame#setLayout

Related questions

How to place a JButton at a desired location in a JFrame using Java

I want to put a Jbutton on a particular coordinate in a JFrame. I put setBounds for the JPanel (which I placed on the JFrame) and also setBounds for the JButton. However, they dont seem to function as expected. My …

Read More
How to open a new window by clicking a button

As a part of my program, I need to have a button that when the user click on it, it opens a new window. Well I guess I should have a class that make the frame and call it by …

Read More
Button ActionListener

Ok, so I made a simple program that adds the value to counter each time a button is clicked. Now, I would like to add "Auto" button feature to increase the value of the counter when the "Auto" button is …

Read More