如何让JScrollPane填充JPanel的高度

Question

我从Java和Swing开始,所以我有一个非常简单的问题,但我找不到任何(简单)方法来解决它...

我的意思是只有一个列表滚动器占据一个面板的整个高度,仅此而已.这是我已编写的代码,thanx帮助我找到实现目标的方法:

public class TestCode {

public static void main(String[] args) {

    JFrame window = new JFrame("Test");
    window.setSize(300, 300);
    window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    JPanel panelUp = new JPanel();
    JPanel panelCenter = new JPanel();
    JPanel panelDown = new JPanel();

    window.add(panelUp, BorderLayout.NORTH);
    window.add(panelCenter, BorderLayout.WEST);
    window.add(panelDown, BorderLayout.SOUTH);

    panelUp.setBackground(new Color(200, 240, 200));
    panelCenter.setBackground(new Color(240, 200, 200));
    panelDown.setBackground(new Color(200, 200, 240));

    Vector v = new Vector();
    v.addElement("Element 1");
    v.addElement("Element 2");
    v.addElement("Element 3");
    v.addElement("Element 4");
    v.addElement("Element 5");
    v.addElement("Element 6");

    JList list = new JList(v);
    JScrollPane listScroller = new JScrollPane(list);

    panelCenter.add(listScroller);

    window.setVisible(true);
}

}

Answer 1

a的默认布局JPanel是a FlowLayout,要使控件居中并填充JPanel,您需要使用BorderLayout.试试这个:

panelCenter.setLayout(new BorderLayout());
panelCenter.add(listScroller, BorderLayout.CENTER);