Java GUI GridBagLayout如何在一列中容纳三个组合框？

Container container = getContentPane();
GridBagLayout layout = new GridBagLayout();
container.setLayout(layout);

JComboBox<String> comboBox1 = new JComboBox<>();
JComboBox<String> comboBox2 = new JComboBox<>();
JComboBox<String> comboBox3 = new JComboBox<>();

// 设置组合框的选项
comboBox1.addItem("选项1");
comboBox1.addItem("选项2");
// ...

// 设置其他属性，如大小、字体等

GridBagConstraints constraints = new GridBagConstraints();
constraints.gridx = 0;  // 列索引为0
constraints.gridy = 0;  // 行索引为0
constraints.fill = GridBagConstraints.HORIZONTAL;  // 水平填充
constraints.weightx = 1.0;  // 水平方向上的扩展权重
constraints.insets = new Insets(5, 5, 5, 5);  // 设置组件的内边距

container.add(comboBox1, constraints);

constraints.gridy = 1;  // 行索引为1
container.add(comboBox2, constraints);

constraints.gridy = 2;  // 行索引为2
container.add(comboBox3, constraints);