java - 图像查看器语法问题 fileChooser 方法

Question

我的图像查看器出现问题，它要求我的文件选择器返回方法。该程序应该为一只猫打开一张图片。

我不知道如何修复我的语法错误。

我只是想解决图像查看器方法中文件选择器的问题，继续查看是否有更多问题，我是 GUI 新手 ----jGRASP 执行程序:javac -g ImageViewerr.java

ImageViewerr.java:32: 错误:方法声明无效；需要返回类型 私有(private)文件选择器() ^1 个错误

----jGRASP wedge2:进程的退出代码为 1。 ----jGRASP:操作完成。

   import java.awt.*;
   import java.awt.event.*;
   import javax.swing.*;
   import javax.swing.filechooser.*;
   import java.io.File;

   public class ImageViewerr extends JFrame
 {
private JPanel imagePanel;
private JPanel buttonPanel;
private JLabel imageLabel;
private JButton button;
private JFileChooser fileChooser;

public ImageViewerr()
 {
setTitle( "Image Viewer" );
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLayout(new BorderLayout());

buildImagePanel();
buildButtonPanel();

add(imagePanel, BorderLayout.CENTER);
add(buttonPanel,BorderLayout.SOUTH);

pack();
setLocationRelativeTo( null );
setVisible( true );

    private fileChooser()
  {

fileChooser = new JFileChooser( "." );  

    fileNameExtensionFilter defaultFilter = new FileNameExtensionFilter(      "Image Files", "jpg"
                                                                                           ,"gif", "png" );
    fileChooser.addChoosableFileFilter( defaultFilter );

    fileChooser.addChoosableFileFilter(
                    new FileNameExtensionFilter( "JPEG Files", "jpg" ) );

    fileChooser.addChoosableFileFilter(
                    new FileNameExtensionFilter( "GIF Files", "gif" ) );

    fileChooser.addChoosableFileFilter(
                    new FileNameExtensionFilter( "PNG Files", "png" ) );

    fileChooser.setFileFilter( defaultFilter );

    fileChooser.setDialogTitle( "Select Image File" );
    }
  }

 private void buildImagePanel()
{
  imagePanel = new JPanel();

  imageLabel = new JLabel("Click here to " +
                          "get an image");

  imagePanel.add(imageLabel);
}

private void buildButtonPanel()
 {
   buttonPanel = new JPanel();
   menuItem.setMnemonic(KeyEvent.VK_G);

  button = new JButton("Get Image");

  button.addActionListener(new ButtonListener());


   buttonPanel.add(button);
 }

private class ButtonListener implements ActionListener
{ 
  File selectedFile;
  ImageIcon image;
  String filename;
  int fileChooserStatus;

public void actionPerformed( ActionEvent e )
{ 

  fileChooserStatus = fileChooser.showOpenDialog( ImageViewer.this );

 if( fileChooserStatus == JFileChooser.APPROVE_OPTION )
{
     selectedFile = fileChooser.getSelectedFile();
     filename = selectedFile.getPath();
     image = new ImageIcon( filename );

     imageLabel.setIcon( image );
     imageLabel.setText( null );

    pack();
  }


  }
}

public static void main( String[] args )
{
 new ImageViewerr();
}

}

Answer 1

private fileChooser()

应该是:

private void fileChooser()

如果没有返回类型，Java 将假定它是一个构造函数。