框架中添加了2个面板

Question

I am trying to add to JPanels to JFrame but the second one just go on top of the first one and I can't seem to understand why or how to fix it.

Below is the UI that I try to add. Thanks a lot,

Rotem

private static void createAndShowGUI() {
    JFrame f = new JFrame("Maman 13 - Part 2");
    f.setLayout(new BorderLayout());
    //f.setResizable(false);
    f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    FlowLayout alignLeftLayout = new FlowLayout(FlowLayout.LEFT, 5, 5);
    // first row
    Hashtable<Integer, JButton> hashTable = new Hashtable<Integer, JButton>();
    LinkedHashMap<String, Integer> buttons = new LinkedHashMap<String, Integer>();
    addFirstRow(buttons);
    JPanel firstRow = new KeyboardRow(hashTable, buttons);
    firstRow.setLayout(alignLeftLayout);
    f.add(firstRow);
    // second row
    buttons = new LinkedHashMap<String, Integer>();
    addSecondRow(buttons);
    JPanel secondRow = new KeyboardRow(hashTable, buttons);
    secondRow.setLayout(alignLeftLayout);
    f.add(secondRow);

    f.pack();
    f.setVisible(true);
}

Answer 1

Instead of

f.setLayout(new BorderLayout());

try

f.setLayout(new GridLayout());

Answer 2

I think you need to do like

f.add(firstRow, BorderLayout.WEST)

and

f.add(secondRow, BorderLayout.EAST)

or something like that. You are not specifying how to use the BorderLayout scheme you added.

Answer 3

Try using the following to replace your f.add([something]); lines.

f.add(firstRow, BorderPanel.LINE_START);
f.add(secondRow, BorderPanel.LINE_END);

This should put the firstRow panel on the left, and the secondRow panel on the right.

This works because a BorderLayout is built to hold up to five panels, as explained here: http://docs.oracle.com/javase/7/docs/api/java/awt/BorderLayout.html

Your existing code just adds the new panels to f, without specifying where they should go.