Question

hy，我正在尝试向窗格添加多个jbuttons并想要滚动它们。所以我所做的是首先添加按钮到jpanel比jpanel到jscrollpane而不是jscrollpane到另一个jpanel等等。但我得到的问题是按钮显示但没有滚动条滚动窗格并看到所有按钮。

import java.awt.*;

import javax.swing.*;

import java.awt.event.*;

class ICFTWindow extends JFrame

{
JPanel mainPanel,userlistPanel,chatPanel,userlistPanel2;
JButton checkButton,button2,button3,button4,button5,button6;
JScrollPane scrollpane;
JScrollBar scrollbar;

ICFTWindow()
{
    mainPanel = new JPanel();
    mainPanel.setLayout(null);

    userlistPanel = new JPanel(new FlowLayout());
    userlistPanel.setBounds(0,0,160,270);
    userlistPanel2 = new JPanel();
    userlistPanel2.setBounds(0,0,100,270);
    userlistPanel2.setLayout(new BorderLayout());

    scrollpane = new JScrollPane(userlistPanel);

    checkButton = new JButton();
    checkButton.setPreferredSize(new Dimension(90, 50));

    button2 = new JButton();
    button2.setPreferredSize(new Dimension(90, 50));

    button3 = new JButton();
    button3.setPreferredSize(new Dimension(90, 50));

    button4 = new JButton();
    button4.setPreferredSize(new Dimension(90, 50));

    button5 = new JButton();
    button5.setPreferredSize(new Dimension(90, 50));

    button6 = new JButton();
    button6.setPreferredSize(new Dimension(90, 50));

    userlistPanel.setBorder(BorderFactory.createLineBorder(Color.black));

    scrollpane.add(userlistPanel);
    mainPanel.add(userlistPanel);

    userlistPanel.add(button2);
    userlistPanel.validate();
    userlistPanel.add(checkButton);
    userlistPanel.validate();
    userlistPanel.add(button3);
    userlistPanel.validate();
    userlistPanel.add(button4);
    userlistPanel.validate();
    userlistPanel.add(button5);
    userlistPanel.validate();
    userlistPanel.add(button6);
    userlistPanel.validate();

    userlistPanel.validate();
    userlistPanel2.add(scrollpane);
    mainPanel.add(userlistPanel2);
    add(mainPanel);
    setSize(500,300);
    setVisible(true);

}

public static void main(String args[])
{
    new ICFTWindow();
}
}

Answer 1

删除这两行：

scrollpane.add(userlistPanel);
mainPanel.add(userlistPanel);

您不需要将JPanel（您想要滚动条）添加到JScrollPane。将它发送到滚动窗格的构造函数就足够了。

之后，您必须将滚动窗格添加到顶级组件，它还将添加其中包含的面板并在其上放置滚动条。有关如何使用滚动窗格的详细信息，请参阅here。

如何将jbuttons添加到jscrollpane

1 个答案: