更改ImageIcon顯示在JFrame中

Question

我在這裏有這個代碼。我希望它在調用main方法時首先顯示用戶輸入的圖像文件，然後對其應用更改。我的第一個功能是灰度（）。我在JMenuBar中提供了一個灰度按鈕，當點擊它時，它會創建當前圖像的灰度版本。它可以工作，但是在應用該方法後，我無法在JFrame中顯示新圖像。我試過調用show（）;在方法內，但是隻是再次打開原始圖像。我知道灰度函數正在完成它的工作，它只是不顯示結果後的圖像。如何在創建image2後顯示它？謝謝您的幫助。

import java.awt.*; 
import java.awt.event.*; 
import java.util.*; 
import java.io.*; 
import javax.swing.*; 
import java.awt.image.*; 
import javax.imageio.ImageIO; 

public class ImageEdit{ 
    Container content; 
    static BufferedImage image; 
    BufferedImage image2; 

    public ImageEdit(String filename) { 
     File f = new File(filename); 
     //assume file is the image file 
     try { 
      image = ImageIO.read(f); 
     } 
     catch (IOException e) { 
      System.out.println("Invalid image file: " + filename); 
      System.exit(0); 
     } 
    } 

    public void show() { 
     final int width = image.getWidth(); 
     final int height = image.getHeight(); 

     JFrame frame = new JFrame("Edit Picture"); 

     //set frame title, set it visible, etc 
     content = frame.getContentPane(); 
     frame.setResizable(false); 
     frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 

     //add the image to the frame 
     ImageIcon icon = new ImageIcon(image); 
     frame.setContentPane(new JLabel(icon)); 
     frame.pack(); 

     //add a menubar on the frame with a single option: saving the image 
     JMenuBar menuBar = new JMenuBar(); 
     frame.setJMenuBar(menuBar); 
     JMenu fileMenu = new JMenu("File"); 
     menuBar.add(fileMenu); 
     JMenuItem saveAction = new JMenuItem("Save"); 
     fileMenu.add(saveAction); 
     JMenuItem grayScale = new JMenuItem("Grayscale"); 
     fileMenu.add(grayScale); 
     grayScale.addActionListener(new ActionListener() { 
       public void actionPerformed(ActionEvent e) { 
        grayscale(width, height); 
       } 
      }); 

     //paint the frame 
     frame.setVisible(true); 
    } 

    public void grayscale(int width, int height) { 
     // create a grayscale image the same size 
     image2 = new BufferedImage(width, height, BufferedImage.TYPE_BYTE_GRAY); 

     // convert the original colored image to grayscale 
     ColorConvertOp grayScale = new ColorConvertOp(
      image.getColorModel().getColorSpace(), 
     image2.getColorModel().getColorSpace(),null); 
     grayScale.filter(image,image2); 
     show(); 
    } 

    public static void main(String[] args) { 
     ImageEdit p = new ImageEdit(args[0]); 
     p.show(); 
    } 
} 

Answer 1

import java.awt.*; 
import java.awt.image.*; 
import java.awt.event.*; 
import javax.swing.*; 

public class ImageEdit{ 
    Container content; 
    BufferedImage image; 
    BufferedImage image2; 
    JLabel imageLabel; 

    public ImageEdit(BufferedImage image) { 
     this.image = image; 
    } 

    public void show() { 
     final int width = image.getWidth(); 
     final int height = image.getHeight(); 

     JFrame frame = new JFrame("Edit Picture"); 

     //set frame title, set it visible, etc 
     content = frame.getContentPane(); 
     //frame.setResizable(false); 
     frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 

     //add the image to the frame 
     ImageIcon icon = new ImageIcon(image); 
     imageLabel = new JLabel(icon); 
     frame.setContentPane(imageLabel); 

     //add a menubar on the frame with a single option: saving the image 
     JMenuBar menuBar = new JMenuBar(); 
     frame.setJMenuBar(menuBar); 
     JMenu fileMenu = new JMenu("File"); 
     menuBar.add(fileMenu); 
     JMenuItem saveAction = new JMenuItem("Save"); 
     fileMenu.add(saveAction); 
     JMenuItem grayScale = new JMenuItem("Grayscale"); 
     fileMenu.add(grayScale); 
     grayScale.addActionListener(new ActionListener() { 
       public void actionPerformed(ActionEvent e) { 
        grayscale(width, height); 
       } 
      }); 

     //paint the frame 
     frame.pack(); 
     frame.setVisible(true); 
    } 

    public void grayscale(int width, int height) { 
     // create a grayscale image the same size 
     image2 = new BufferedImage(width, height, BufferedImage.TYPE_BYTE_GRAY); 

     // convert the original colored image to grayscale 
     ColorConvertOp grayScale = new ColorConvertOp(
      image.getColorModel().getColorSpace(), 
     image2.getColorModel().getColorSpace(),null); 
     grayScale.filter(image,image2); 
     imageLabel.setIcon(new ImageIcon(image2)); 
     //show(); 
    } 

    public static void main(String[] args) { 
     int size = 120; 
     int pad = 10; 
     BufferedImage bi = new BufferedImage(
      size, 
      size, 
      BufferedImage.TYPE_INT_RGB); 
     Graphics g = bi.createGraphics(); 
     g.setColor(Color.WHITE); 
     g.fillRect(0,0,size,size); 
     g.setColor(Color.YELLOW); 
     g.fillOval(pad,pad,size-(2*pad),size-(2*pad)); 
     g.dispose(); 

     ImageEdit p = new ImageEdit(bi); 
     p.show(); 
    } 
}