如何声明Map的通用映射(How to declare generic Map of Map)

 如果JTextFields不在同一个容器中，这将是一种可能的方法： 
 
private List<JTextField> allTextFields = new ArrayList<JTextField>();

private JTextField createNewTextField(String text) {
    JTextField textField = new JTextField(text);
    allTextFields.add(textField);
    return textField;
}

private void resetAllTextFields(){
    for (JTextField textField : allTextFields) {
        textField.setText("");
    }
}
 
 ..然后，而不是使用构造函数JTextField myTextField = new JTextField("content")使用JTextField myTextField = createNewTextField("content"); 

If the JTextFields are not all in the same container, this would be a possible approach:
 
private List<JTextField> allTextFields = new ArrayList<JTextField>();

private JTextField createNewTextField(String text) {
    JTextField textField = new JTextField(text);
    allTextFields.add(textField);
    return textField;
}

private void resetAllTextFields(){
    for (JTextField textField : allTextFields) {
        textField.setText("");
    }
}
 
..and then instead of using the constructor JTextField myTextField = new JTextField("content") use JTextField myTextField = createNewTextField("content");