Java摆动网格布局元素在网格Y中重叠

Question

我正在学习如何使用Java Swing中的GridBagLayout。。。

在这个例子中，我想在每一行中放置4个元素，正如您在我的代码中看到的那样：

        this.setLayout(new GridBagLayout());
        GridBagConstraints constraints = new GridBagConstraints();
        
        constraints.gridx = 0;
        constraints.gridy = 0;
        constraints.gridwidth = 1;
        constraints.gridheight = 1;
        //constraints.weighty = 1;
        constraints.anchor = GridBagConstraints.NORTHWEST;
        constraints.fill = constraints.HORIZONTAL;
        this.add(label1, constraints);
        constraints.weighty = 0.0; 
        
        constraints.gridx = 1;
        constraints.gridy = 1;
        constraints.gridwidth = 0;
        constraints.gridheight = 1;
        constraints.weighty = 1;
        constraints.anchor = GridBagConstraints.CENTER;
        constraints.fill = constraints.BOTH;
        this.add(label, constraints);
        constraints.weighty = 0.0; 
        
        JLabel precio = new JLabel();
        precio.setText("Precio    12345.5");
        constraints.gridx = 0;
        constraints.gridy = 2;
        constraints.gridwidth = 2;
        constraints.gridheight = 2;
        constraints.weighty = 1;
        constraints.fill = constraints.HORIZONTAL;
        constraints.anchor = GridBagConstraints.NORTH;
        this.add(precio, constraints);
        constraints.weighty = 0.0; 
        
        JLabel cantidad = new JLabel();
        cantidad.setText("Cantidad    ");
        constraints.gridx = 0;
        constraints.gridy = 3;
        constraints.gridwidth = 2;
        constraints.gridheight = 2;
        constraints.weightx = 1;
        constraints.fill = constraints.HORIZONTAL;
        constraints.anchor = GridBagConstraints.NORTH;
        this.add(cantidad, constraints);
        constraints.weighty = 0.0; 
        
        JTextField textfield = new JTextField();
        textfield.setPreferredSize(new Dimension(100 , 30));
        constraints.gridx = 2;
        constraints.gridy = 3;
        constraints.gridwidth = 2;
        constraints.gridheight = 2;
        constraints.weighty = 1;
        constraints.fill = constraints.HORIZONTAL;
        this.add(textfield, constraints);
        constraints.weighty = 0.0; 
        
        JButton boton = new JButton();
        boton.setText("Agregar");
        constraints.gridx = 0;
        constraints.gridy = 4;
        constraints.gridwidth = 2;
        constraints.gridheight = 2;
        constraints.weightx = 1;
        constraints.fill = constraints.HORIZONTAL;
        constraints.anchor = GridBagConstraints.NORTH;
        this.add(precio, constraints);
        constraints.weighty = 0.0; 

正如您在代码中看到的那样。

在第0行中，我想放置一个JLabel

在第1行中，我想放一个带有图标的JLabel

在第2行中，我想放置一个JTextField

在第3行中，我想在右侧放置一个JTextfield和JTextfield

最后在第4行，我想在列的中心放置一个JButton

但当我运行JFrame时，我得到了以下信息：

从第二排开始，我让组件重叠，我不知道为什么。

也许我在GridBagLayout行为中遗漏了一些东西，因为我仍在学习如何使用它。

欢迎任何帮助！谢谢

Answer 1

Oracle提供了一个有用的教程，使用Swing创建GUI。跳过NetBeans IDE部分的学习摇摆。

您的代码有几个语法错误。一旦我修复了这些，我就运行你的代码。

我不确定你到底想要什么。根据您的描述，我修改了您的代码以生成以下GUI。

使用GridBagLayout时，某些参数可以设置一次，其他参数可以为每个Swing组件修改。有关详细信息，请参阅Oracle教程How to use GridBagLayout。

下次，发布可以复制到IDE并进行测试的可运行代码。

这是我使用的完整可运行代码。

import java.awt.BorderLayout;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;

import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;

public class GridBagLayoutExample implements Runnable {

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new GridBagLayoutExample());
    }

    @Override
    public void run() {
        JFrame frame = new JFrame("Cell-33");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        frame.add(createMainPanel(), BorderLayout.CENTER);

        frame.pack();
        frame.setLocationByPlatform(true);
        frame.setVisible(true);
    }

    public JPanel createMainPanel() {
        JPanel panel = new JPanel(new GridBagLayout());
        panel.setBorder(BorderFactory.createEmptyBorder(0, 5, 5, 5));

        GridBagConstraints constraints = new GridBagConstraints();

        constraints.anchor = GridBagConstraints.LINE_START;
        constraints.fill = GridBagConstraints.HORIZONTAL;
        constraints.insets = new Insets(0, 10, 5, 10);
        constraints.gridwidth = 1;
        constraints.gridheight = 1;

        constraints.gridx = 0;
        constraints.gridy = 0;
        JLabel label1 = new JLabel("Label1");
        panel.add(label1, constraints);

        constraints.gridx++;
        JLabel label = new JLabel("Label");
        panel.add(label, constraints);

        constraints.gridx++;
        JLabel precio = new JLabel();
        precio.setText("Precio    12345.5");
        panel.add(precio, constraints);

        constraints.gridx++;
        JLabel cantidad = new JLabel("Cantidad");
        panel.add(cantidad, constraints);

        constraints.gridx++;
        JTextField textfield = new JTextField(20);
        panel.add(textfield, constraints);

        constraints.gridx++;
        JButton boton = new JButton();
        boton.setText("Agregar");
        panel.add(boton, constraints);

        return panel;
    }

}