JFileChooser 不会按我的意愿逐行打印我的文件。我怎么能够？

Question

My code will bring up the JFileChooser GUI, but when I select a file from my desktop, it will not print the contents of the file line by line as I wish. Your help would be appreciated.

public static void main(String[] args) {
        File file;
        Scanner in;
        int click;
        
        
        JFileChooser jfc = new JFileChooser();
        
        jfc.setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES);
        click = jfc.showSaveDialog(null);
        if(jfc.equals(JFileChooser.APPROVE_OPTION))
        {
            file = jfc.getSelectedFile();
            try
            {
                in = new Scanner(file);
                if(file.isFile())
                {
                    while(in.hasNextLine())
                    {
                        String fileline = in.nextLine();
                        System.out.println(fileline);
                    }
                }
                in.close();
            } catch(FileNotFoundException e )
            {
                System.out.println("Cannot locate file.");
            }
        }
        
    }

Answer 1

if(jfc.equals(JFileChooser.APPROVE_OPTION))

为什么要将 JFileChooser 与 APPROVE_OPTION 进行比较？

您想比较从 showOpenDialog() 方法返回的值：

if (click == JFileChooser.APPROVE_OPTION)

JFileChooser 不会按我的意愿逐行打印我的文件。我怎么能够？

The JFileChooser will not print of my file line by line as I wish. How can I?

java

swing

jfilechooser

java.util.scanner