Java 为什么'；这个GridBagLayout代码不起作用吗？

我有下面的代码

类似的代码也可以工作。还有一位朋友说它应该会起作用。但事实并非如此

有人有线索吗

谢谢

问题描述： 所有的东西都很小，而不是绘制所需的布局。(

您没有为滚动窗格设置任何视图，因此滚动窗格无法确定其首选大小

您没有在按钮上设置文本，因此它只根据边框的要求计算按钮的大小

不要弄乱

setXxxSize

，您的

ChatGUI

应该不知道它可能需要占用的可视大小

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你调试过你的程序吗？因为没有编译器错误，这很可能是一个逻辑错误，没有。所以你没有调试你的程序。你也不需要编译器错误来调试。非常有用，谢谢。调试器怎么会告诉我我需要知道才能看到misakte？例如，它可以帮助你在逻辑上一步一步地进行调试啊，你得一步一步地修改你的程序，直到你能更清楚地看到发生的错误为止。@Mad教授：是的，这就是轨迹。我明天要检查，现在要迟到了。但这很有道理，所以我只能说：啊！我可能会想到这个。。。谢谢！To 3）：大小将由另一个类设置，该类将chatGUI作为主JFrame内的窗格调用。无论如何：谢谢！

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Frame;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Image;
import javax.swing.JButton;
import javax.swing.JColorChooser;
import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.JPanel;
import javax.swing.JScrollPane;

public class ChatGUI extends JPanel {

    private static final long serialVersionUID = -3069354983197916315L;
    private Image imgBackground;

    private GridBagLayout gblChat;
    private GridBagConstraints constraintsChat;

    private JPanel jPanelChat;
    private JList clientList;

    private JColorChooser font_chooser;

    private JButton privateMessage_button;
    private JButton sendMessage_button;

    private JScrollPane OutputOfChatMessages;
    private JScrollPane ShowConnectedClients;
    private JScrollPane InputOfChatMessage;

    public static void main(String[] args) {

        JFrame jf = new JFrame();

        ChatGUI cg1 = new ChatGUI(500, 500);

        jf.add(cg1);

        jf.setExtendedState(Frame.MAXIMIZED_BOTH);
        jf.setVisible(true);
    }

    /**
     * Layout
     */
    public ChatGUI(int width, int height) {

        // used for scaling
        this.setMinimumSize(new Dimension(width / 2,
                height / 4));
        this.setPreferredSize(new Dimension(width / 2,
                height / 4));

        jPanelChat = new JPanel();
        gblChat = new GridBagLayout();
        constraintsChat = new GridBagConstraints();

        this.setLayout(gblChat);
        this.setBackground(Color.LIGHT_GRAY);
        constraintsChat.fill = GridBagConstraints.BOTH;

        /**
         * Panel 1 = OutputOfChatMessages
         */
        OutputOfChatMessages = new JScrollPane();

        constraintsChat.gridx = 0;
        constraintsChat.gridy = 0;
        constraintsChat.gridwidth = 1;
        constraintsChat.gridheight = 1;
        gblChat.setConstraints(OutputOfChatMessages, constraintsChat);

        this.add(OutputOfChatMessages);

        /**
         * Panel 2 = ShowConnectedClients
         */
        ShowConnectedClients = new JScrollPane();

        constraintsChat.gridx = 1;
        constraintsChat.gridy = 0;
        constraintsChat.gridwidth = 4;
        constraintsChat.gridheight = 4;
        gblChat.setConstraints(ShowConnectedClients, constraintsChat);

        this.add(ShowConnectedClients);

        /**
         * Panel 3 = InputOfChatMessage
         */
        InputOfChatMessage = new JScrollPane();

        constraintsChat.gridx = 0;
        constraintsChat.gridy = 5;
        constraintsChat.gridwidth = 2;
        constraintsChat.gridheight = 2;
        gblChat.setConstraints(InputOfChatMessage, constraintsChat);

        this.add(ShowConnectedClients);

        /**
         * Panel 4 = privateMessage_button
         */
        privateMessage_button = new JButton();

        constraintsChat.gridx = 1;
        constraintsChat.gridy = 6;
        constraintsChat.gridwidth = 1;
        constraintsChat.gridheight = 1;
        gblChat.setConstraints(privateMessage_button, constraintsChat);

        this.add(privateMessage_button);

        /**
         * Panel 5 = sendMessage_button
         */
        sendMessage_button = new JButton();

        constraintsChat.gridx = 1;
        constraintsChat.gridy = 7;
        constraintsChat.gridwidth = 1;
        constraintsChat.gridheight = 1;
        gblChat.setConstraints(sendMessage_button, constraintsChat);

        this.add(sendMessage_button);

        this.validate();
//this.revalidate();

    }
}