Java GUI：顯示區域和8個按鈕

Question

我想要一個顯示區域和8個按鈕。 每個按鈕將在顯示區域中顯示不同的文字。

目前我只有顯示區域，但是當我嘗試添加A按鈕時，按鈕與顯示區域重疊。 那麼我怎麼能有一個顯示區域和8個按鈕。

JPanel middlePanel = new JPanel(); 
middlePanel.setBorder (new TitledBorder (new EtchedBorder(), "Display Area")); 

// create the middle panel components 

JTextArea display = new JTextArea (16, 58); 
display.setEditable (false); // set textArea non-editable 
JScrollPane scroll = new JScrollPane (display); 
scroll.setVerticalScrollBarPolicy (ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS); 

//Add Textarea in to middle panel 
middlePanel.add (scroll); 

// My code 
JFrame frame = new JFrame(); 
JFrame btn = new JFrame(); 
frame.add (middlePanel); 
frame.pack(); 
frame.setLocationRelativeTo (null); 

JButton one = new JButton("1"); 
JPanel panel = new JPanel(); 
panel.add(one); 
//btn.getContentPane().add(BorderLayout.CENTER,panel); 
btn.setVisible(true); 
frame.setVisible (true); 

Answer 1

使用兩個容器，一個文本區域和一個按鈕，每一個都有自己的佈局管理器...

JPanel middlePanel = new JPanel (new BorderLayout()); 
middlePanel.setBorder (new TitledBorder (new EtchedBorder(), "Display Area")); 

JTextArea display = new JTextArea (16, 58); 
display.setEditable (false); // set textArea non-editable 
JScrollPane scroll = new JScrollPane (display); 
scroll.setVerticalScrollBarPolicy (ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS); 

middlePanel.add (scroll); 

JPanel buttonPane = new JPanel(); // FlowLayout by default... 
buttonPane.add(...); // Add your buttons here... 

JFrame frame = new JFrame(); 
frame.add (middlePanel); 
frame.add(buttonPane, BorderLayout.SOUTH); 
frame.pack(); 
frame.setLocationRelativeTo (null); 
frame.setVisible(true); 

這就是俗稱的複合佈局;）

Answer 2

JPanel middlePanel = new JPanel(); 
    middlePanel.setBorder (new TitledBorder (new EtchedBorder(), "Display Area")); 

    // create the middle panel components 

    JTextArea display = new JTextArea (16, 58); 
    display.setEditable (false); // set textArea non-editable 
    JScrollPane scroll = new JScrollPane (display); 
    scroll.setVerticalScrollBarPolicy (ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS); 

    //Add Textarea in to middle panel 
    middlePanel.add (scroll); 
    JPanel buttonPane = new JPanel(); // FlowLayout by default... 
    buttonPane.add(new JButton("1")); // Add your buttons here... 
    buttonPane.add(new JButton("2")); 
    buttonPane.add(new JButton("3")); 
    buttonPane.add(new JButton("4")); 
    // My code 
    JFrame frame = new JFrame(); 
    JFrame btn = new JFrame(); 
    frame.add (middlePanel); 
    frame.add(buttonPane,BorderLayout.SOUTH); 
    frame.pack(); 
    frame.setLocationRelativeTo (null); 


    //btn.getContentPane().add(BorderLayout.CENTER,panel); 
    btn.setVisible(true); 
    frame.setVisible (true);