java - 尝试为文本字段设置文本

Question

我目前正在学校的一个团队项目中工作，但在 fieldMap 中的 textFields 上 setText() 时遇到困难。我可以使用 fieldMap.get(fieldTitle.values()[i]) 从它们获取值，但由于我对 HashMap 和 gbcs 缺乏了解，我无法弄清楚如何将文本设置到文本字段.

class InstructorEditorPanel extends JPanel {
enum FieldTitle {
  B_NUMBER("B Number"), FIRST_NAME("First Name"), LAST_NAME("Last Name");
  private String title;

  private FieldTitle(String title) {
     this.title = title;
  }

  public String getTitle() {
     return title;
  }
};

private static final Insets WEST_INSETS = new Insets(5, 0, 5, 5);
private static final Insets EAST_INSETS = new Insets(5, 5, 5, 0);
private Map<FieldTitle, JTextField> fieldMap = new HashMap<FieldTitle, JTextField>();

public InstructorEditorPanel() {
  setLayout(new GridBagLayout());
  setBorder(BorderFactory.createCompoundBorder(
        BorderFactory.createTitledBorder("Instructor Editor"),
        BorderFactory.createEmptyBorder(5, 5, 5, 5)));
  GridBagConstraints gbc;
  for (int i = 0; i < FieldTitle.values().length; i++) {
     FieldTitle fieldTitle = FieldTitle.values()[i];
     gbc = createGbc(0, i);
     add(new JLabel(fieldTitle.getTitle() + ":", JLabel.LEFT), gbc);
     gbc = createGbc(1, i);
     JTextField textField = new JTextField(10);
     add(textField, gbc);

     fieldMap.put(fieldTitle, textField);
  }
}

private GridBagConstraints createGbc(int x, int y) {
  GridBagConstraints gbc = new GridBagConstraints();
  gbc.gridx = x;
  gbc.gridy = y;
  gbc.gridwidth = 1;
  gbc.gridheight = 1;

  gbc.anchor = (x == 0) ? GridBagConstraints.WEST : GridBagConstraints.EAST;
  gbc.fill = (x == 0) ? GridBagConstraints.BOTH
        : GridBagConstraints.HORIZONTAL;

  gbc.insets = (x == 0) ? WEST_INSETS : EAST_INSETS;
  gbc.weightx = (x == 0) ? 0.1 : 1.0;
  gbc.weighty = 1.0;
  return gbc;
}

public String getFieldText(FieldTitle fieldTitle) {
  return fieldMap.get(fieldTitle).getText();
}

Answer 1

如果您必须在文本字段中设置文本，请调用 setText该文本字段上的方法。

因为您已经通过调用来检索 textField

fieldMap.get(fieldTitle.values()[i])

您可以通过调用 setText 方法来设置文本，例如:

fieldMap.get(fieldTitle.values()[i]).setText('Something');