如何在 Java JFrame GUI 中使用 requestFocus？
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How do I use requestFocus in a Java JFrame GUI?
提问by CppLearner
I am given an assignment but I am totally new to Java (I have been programming in C++ and Python for two years).
我得到了一项作业，但我对 Java 完全陌生（我已经用 C++ 和 Python 编程了两年）。
So we are doing GUI and basically we extended JFrame and added a couple fields.
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。
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
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
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;
}
But that doesn't work at all.
但这根本行不通。
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...
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...
回答by Lawrence Dol
Well, you have textfield1.requestFocus(), but your description would imply you need textfield2.requestFocus(). (that's 2).
嗯，你有textfield1.requestFocus()，但你的描述暗示你需要textfield2.requestFocus()。（那是2）。
回答by camickr
Another option might be to use:
另一种选择可能是使用：
textField1.transferFocus();
This way you don't need to know the name of the next component on the form.
这样您就不需要知道表单上下一个组件的名称。
