如何在 Java JFrame GUI 中使用 requestFocus?

问题描述

我收到了一份作业，但我对 Java 完全陌生(我已经用 C++ 和 Python 编程了两年).

I am given an assignment but I am totally new to Java (I have been programming in C++ and Python for two years).

所以我们正在做 GUI，基本上我们扩展了 JFrame 并添加了几个字段.

So we are doing GUI and basically we extended JFrame and added a couple fields.

假设我们有一个名为Text 1"和Text 2"的字段.当用户在文本 1 中使用光标按下 Enter 键时，将焦点移至文本 2.我尝试添加

Say we have a field named "Text 1" and "Text 2". When user presses enter with the cursor in Text 1, move the focus to Text 2. I tried to add

private JTextField textfield1() {

    textfield1 = new JTextField();
    textfield1.setPreferredSize(new Dimension(200, 20));

    textfield1.addActionListener(
                           new ActionListener() {
                        public void actionPerformed(ActionEvent e) {

                            textfield1text = textfield1.getText().trim();
                            textfield1.setText(textfield1text);
                            System.out.println(textfield1text);

                            textfield1.requestFocus();
                        }
                    });

    return textfield1;
}

但这根本行不通.

我注意到不推荐使用 requestFocus，而应该使用 requestFocusWindows.但我也试过了.经过一些阅读，似乎我必须做键盘动作和听者?但是我的老师说它只需要 1 行...

I noticed that requestFocus is not recommended, and instead one should use requestFocusWindows. But I tried that too. Upon some readings it seems like I have to do keyboard action and listener? But my teacher said it only requires 1 line...

推荐答案

好吧，你有 textfield1.requestFocus()，但你的描述暗示你需要 textfield2.requestFocus().(这是2).

Well, you have textfield1.requestFocus(), but your description would imply you need textfield2.requestFocus(). (that's 2).

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