GridBagLayout元素在網格Y中重疊

我正在學習如何GridBagLayout從 Java Swing 中使用...

在此示例中，我想在每行中放置 4 個元素，如您在我的代碼中所見：

        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; 

正如您在代碼中看到的那樣。

在第 0 行，我想放一個 JLabel

在第 1 行，我想放一個帶有圖示的 JLabel

在第 2 行，我想放一個 JTextField

在第 3 行，我想在右側放置一個 JTextfield 和 JTextField

最后在第 4 行，我想在列的中心放置一個 JButton。

但是當我運行 JFrame 時我得到了這個：

從第二行開始，我讓組件重疊，我不知道為什么。

也許我從GridBagLayout行為中遺漏了一些東西，因為我仍在學習如何使用它。

uj5u.com熱心網友回復：

Oracle 有一個有用的教程，

使用 aGridBagLayout時，某些引數只設定一次，而其他引數則需要為每個 Swing 組件修改。有關詳細資訊，請參閱 Oracle 教程如何使用 GridBagLayout。

下一次，發布可以復制到 IDE 并進行測驗的可運行代碼。

這是我使用的完整的可運行代碼。

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;
    }

}

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