如何理解 jFileChooser1.showSaveDialog(this) == JFileChooser.APPROVE_OPTION

Question

我试着理解“jFileChooser1.showSaveDialog(this) == JFileChooser.APPROVE_OPTION”是什么意思？

我认为 jFileChooser1.showSaveDialog(this) returns 一个 SaveDialog 但 JFileChooser.APPROVE_OPTION returns yes 或 ok。他们怎么能相等？

      private void save() {
    if (jFileChooser1.showSaveDialog(this) ==
      JFileChooser.APPROVE_OPTION) {
        save(jFileChooser1.getSelectedFile());
    }
  }

  /** Save file with specified File instance */
  private void save(File file) {
    try {
      // Write the text in jta to the specified file
      BufferedOutputStream out = new BufferedOutputStream(
        new FileOutputStream(file));
      byte[] b = (jta.getText()).getBytes();
      out.write(b, 0, b.length);
      out.close();

      // Display the status of the save file operation in jlblStatus
      jlblStatus.setText(file.getName()  + " Saved ");
    }
    catch (IOException ex) {
      jlblStatus.setText("Error saving " + file.getName());
    }
  }

Answer 1

参考 JavaDocs API

public int showSaveDialog(Component parent) throws HeadlessException

弹出 "Save File" 文件选择器对话框。请注意，批准按钮中显示的文本由 L&F 确定。参数： parent - 对话框的父组件，可以为空；详见 showDialog Returns: 弹出时文件选择器的 return 状态：

JFileChooser.CANCEL_OPTION`
JFileChooser.APPROVE_OPTION
JFileChooser.ERROR_OPTION 如果发生错误或对话框被关闭

JavaDocs 可以在这里找到：

https://docs.oracle.com/javase/7/docs/api/javax/swing/JFileChooser.html#showSaveDialog(java.awt.Component)

如何理解 jFileChooser1.showSaveDialog(this) == JFileChooser.APPROVE_OPTION

How to understand jFileChooser1.showSaveDialog(this) == JFileChooser.APPROVE_OPTION

java

jfilechooser