Display Image in Java

This example takes an image from the system and displays it on a frame using ImageIO class. User enters the name of the image using the command prompt and then the program displays the same image on the frame. The image is read from the system by using ImageIO.read(File file) method.

The methods used in this example are:.
drawImage(Image img,int x,int y,ImageObserver observer): This method is used to draw an image. The image is drawn at the top-left corner at (x, y) coordinates in this graphics context's coordinate space
setSize(int height , int width): Use this method to set the size of the frame.
setVisible(boolean b): Pass the boolean value as true to display the image or Vice-Versa. Here we are passing the boolean value as true to display the image on the frame.
getContentPane(): This method gets the content pane in which our GUI component will be added.

Code deacription:
In this example first we imports the required packages. Then create a class named ShowImage that extends the Panel class. Now declare a variable of BufferedImage class. Constructor ShowImage() recieves the name of the image passed at the command prompt in the BufferedReader object and reads the image from the system. Use paint() method to draw the image. Create a frame and an object of ShowImage in the main method. Add this object into content pane, set the size of the frame and define the visibility mode as true to display the image on the frame.

Here is the code of the program :


import java.awt.*;

import java.awt.image.BufferedImage;

import java.io.*;

import javax.imageio.ImageIO;

import javax.swing.JFrame;

public class ShowImage extends Panel {

    BufferedImage  image;

  public ShowImage() {

    try {

  System.out.println("Enter image name\n");

  BufferedReader bf=new BufferedReader(new 

    InputStreamReader(System.in));

   String imageName=bf.readLine();

  File input = new File(imageName);

      image = ImageIO.read(input);

    } catch (IOException ie) {

      System.out.println("Error:"+ie.getMessage());

    }

  }



  public void paint(Graphics g) {

    g.drawImage( image, 0, 0, null);

  }



  static public void main(String args[]) throws

    Exception {

    JFrame frame = new JFrame("Display image");

    Panel panel = new ShowImage();

    frame.getContentPane().add(panel);

    frame.setSize(500, 500);

    frame.setVisible(true);

  }

}

Input on dos Prompts :

C:\image>javac ShowImage.java

C:\image>java ShowImage
Enter image name

rajeshxml2.gif

Input image:rajeshxml2.gif

Output of The Example:

Download this example.

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Related Tags: c com class orm ant form model io components sed color format component value byte int rgb show pixel for

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