Java - 文本字段数组不显示

Question

在我的 GUI 类中，我有一个文本字段数组，我在此类构造函数中对其进行了初始化。代码如下

JTextField[] arrayOne= new JTextField [10];
        for(int a = 0;a < 10;a++)
        {
            arrayOne[a] = new JTextField(String.valueOf(0));
            arrayOne[a].setBounds(189 + a * 50, 156, 39, 23);
            arrayOne[a].setVisible(true);

        }

问题是，当我运行 GUI 时，它不显示这些文本字段。为什么不呢？

Answer 1

您应该在布局中添加 JTextField。

如果您在 for 内扩展 JFrame，则应该使用容器/或类的 add 方法。

阅读this .

Adding Components to a Container

When you add components to a panel or content pane, the arguments you specify to the add method depend on the layout manager that the panel or content pane is using. In fact, some layout managers do not even require you to add the component explicitly; for example, GroupLayout. For example, BorderLayout requires that you specify the area to which the component should be added (using one of the constants defined in BorderLayout) using code like this:

pane.add(aComponent, BorderLayout.PAGE_START); The how-to section for each layout manager has details on what, if any, arguments you need to specify to the add method. Some layout managers, such as GridBagLayout and SpringLayout, require elaborate setup procedures. Many layout managers, however, simply place components based on the order they were added to their container.

Swing containers other than JPanel and content panes generally provide API that you should use instead of the add method. For example, instead of adding a component directly to a scroll pane (or, actually, to its viewport), you either specify the component in the JScrollPane constructor or use setViewportView. Because of specialized API like this, you do not need to know which layout manager (if any) many Swing containers use. (For the curious: scroll panes happen to use a layout manager named ScrollPaneLayout.)

For information about how to add components to a specific container, see the how-to page for the container. You can find the component how-to pages using How to Use Various Components.