Question

java中 关于使用JSplitPane时遇到一个疑惑，求解

首先上代码
public class Test1 extends JFrame
{
public Test1()
{
this.setBounds(100, 100, 700, 500);
this.setDefaultCloseOperation(EXIT_ON_CLOSE);

final JSplitPane splitPane = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT);
this.add(splitPane,BorderLayout.CENTER);

//向拆分窗口加入左右Panel（with BorderLayout）
JPanel leftPanel = new JPanel(new BorderLayout());
leftPanel.setBackground(Color.black);
JPanel rightPanel = new JPanel(new BorderLayout());
rightPanel.setBackground(Color.blue);
splitPane.add(leftPanel);
splitPane.add(rightPanel);

//向rightPanel里添加一个有按钮的Panel到north
JPanel apanel = new JPanel();
apanel.add(new JButton("测试"));
apanel.setBackground(Color.cyan);
rightPanel.add(new JPanel(),BorderLayout.SOUTH);
}

public static void main(String[] strs)
{
new Test1().setVisible(true);
}
}
执行过后，为什么添加到rightPanel的那个apanel 只显示很小一点，而且上面的测试按钮也不显示

Answer 1

rightPanel.add(new JPanel(),BorderLayout.SOUTH);
这一句写错了，应该是：
rightPanel.add(apanel,BorderLayout.SOUTH);

Answer 2

试试设置

pnlMain.setMinimumSize(new Dimension(widthNum, heightNum));
pnlMain.setMaximumSize(new Dimension(widthNum, heightNum));
pnlMain.setPreferredSize(new Dimension(widthNum,heightNum));