如何比较两个 ImageIcon？

Question

Basically, i'm using 2 images for a board game type of thing, and i change it from time to time, So i need to be able to check if two has the same imageIcon. For example if both uses "pirosfigura.png" from the resources folder.

    public String malomcheck() {
    String pirosicon=lblNewLabel.getIcon().toString();
    String pirosfilenev = pirosicon.substring(pirosicon.lastIndexOf("/"  ) + 1);
    String iconfilenev = labelhely_1.getIcon().toString();
    String filenev = iconfilenev.substring(iconfilenev.lastIndexOf("/"  ) + 1);


    if(filenev==pirosfilenev) {
        lblJtkos.setText("piros malom.");
        JOptionPane.showMessageDialog(null, "working");
        return "lefutott";


    }

        return "notworking. very sad.";
    }

By the way the return value of the getIcon().toString() is javax.swing.ImageIcon@cd7e8021 which is refers to the memory place i guess(?) so it's random with every run and for every image therefore it's seems unusable.

Answer 1

One way you can achieve this, is to keep your own mapping of ImageIcon s to files, so that whenever you load an ImageIcon you store it in a Map as a key and its file or some symbolic name/enum as value. This way when you want to compare imIc1 and imIc2 you would write something like:

if (map.get(imIc1).equals(map.get(imIc2)) { ... }

or (if you have descriptive string values )

if (map.get(imIc1).equals("NOT_WORKING_ICON") { ... }

or (if you are using enum values )

if (map.get(imIc1) == NOT_WORKING_ICON ) { ... }

Answer 2

it's so weird for me that there is no method to get to the filepath the Jlabel is using for an image.

Makes perfect sense. A JLabel displays an Icon .

Why should a JLabel know or care about the file path?

You could implement the Icon interface yourself and do the custom painting for the Icon . So not all Icons will have a file path. Only an ImageIcon is created from a file.

The property for the file name belongs to the ImageIcon .

By the way the return value of the getIcon().toString() is javax.swing.ImageIcon@cd7e8021

Image piros=new ImageIcon(this.getClass().getResource("pirosfigura.png")).getImage(); 
celpont.setIcon(new ImageIcon(piros)); 

Look at the above code that you are using.

You area creating an Icon from an Image, so the file information is lost.

Instead you should just create the ImageIcon directly:

ImageIcon icon = new ImageIcon( this.getClass().getResource("pirosfigura.png") ); 
celpont.setIcon( icon ); 
System.out.println( celpont.getIcon() );

I believe the ImageIcon will then save the filename as the "description" for the ImageIcon. It appears the toString() will return the description.