java - 创建 Gridbag 布局

Question

我正在尝试制作一个 gridbaglayout，只是将标签放在垂直窗口中 TextView 顶部的文本框顶部，但我遇到了异常

Exception in thread "main" java.lang.IllegalArgumentException: cannot add to layout: constraints must be a GridBagConstraint
    at java.awt.GridBagLayout.addLayoutComponent(GridBagLayout.java:685)
    at java.awt.Container.addImpl(Container.java:1072)
    at java.awt.Container.add(Container.java:957)
    at javax.swing.JFrame.addImpl(JFrame.java:540)
    at java.awt.Container.add(Container.java:925)
    at guiprojj.gui.main(gui.java:31)

任何人都可以帮助我解决这个异常，也许我误解了 gridbaglayout 的工作原理，如果是这样，如果你能指出我正确的方向，那就太棒了。感谢您的帮助。

package guiprojj;

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Map;

import javax.swing.*;

import com.eclipsesource.json.JsonObject;
import com.google.gson.JsonParser;
import com.json.parsers.JSONParser;
import com.json.parsers.JsonParserFactory;


public class gui {
    public static void main(String[] args)
    {
        JFrame maingui = new JFrame("Gui");
        maingui.setLayout(new GridBagLayout());
        GridBagConstraints c = new GridBagConstraints();
        c.fill = GridBagConstraints.HORIZONTAL;
        JButton enter = new JButton("Enter");
        final JTextArea movieinfo = new JTextArea(5,20);
        final JTextField movietext = new JTextField(16);
        c.gridx = 1;
        c.gridy = 0;
        maingui.add(movietext, maingui);
        final JScrollPane scrolll = new JScrollPane(movieinfo);
        final JLabel titlee = new JLabel("Enter movie name here:");
        maingui.setResizable(false);
        maingui.setVisible(true);
        movieinfo.setLineWrap(true);
        movieinfo.setWrapStyleWord(true);
        movieinfo.setEditable(false);

        scrolll.getPreferredSize();
        //pangui.setPreferredSize(new Dimension(300, 150));
        //pangui.add(scrolll, BorderLayout.CENTER);
        //movieinfo.add(scrolll);
        maingui.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        maingui.pack();
        enter.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent e)  
            {
                System.out.println(Test.getMovieInfo(movietext.getText()));
                 JsonParserFactory factory=JsonParserFactory.getInstance();
                 JSONParser parser=factory.newJsonParser();
                 Map jsonData=parser.parseJson(Test.getMovieInfo(movietext.getText()));
                 String Title = (String)jsonData.get("Title");
                 String Year = (String)jsonData.get("Year");
                 String Plot = (String)jsonData.get("Plot");
                 movieinfo.setText("Title: "+Title+"\nYear: "+ Year +"\nPlot: "+Plot);
            }
            });

        }
}

Answer 1

我认为maingui.add(movietext, maingui);应该是maingui.add(movietext, c);

最后一个参数应该是特定于布局的约束对象。您正在将父对象传递给它。