fileicon.java

JAVA教学用代码

package jfilechooserexample;

import javax.swing.filechooser.FileView;
import java.io.File;
import javax.swing.Icon;
import javax.swing.ImageIcon;

public class FileIcon extends FileView {
    public FileIcon() {
    }
    public String getName(File f)
    {
     return null;
    }
    public String getDescription(File f)
    {
        return null;
    }
    public String getTypeDescription(File f)
    {
        String extension=getExtensionName(f);
        if(extension.equals("java"))
        {
            return "java源文件";
        }
        if(extension.equals("txt"))
        {
            return " 记事本";
        }
       return "";
    }
    public String getExtensionName(File f)
    {
        String extension="";
        String fileName=f.getName();
        int index=fileName.lastIndexOf('.');
        if(index>0&&index<fileName.length()-1)
        {
            extension=fileName.substring(index+1).toString();
        }
        return extension;
    }
    public Boolean isTraversable(File f)
    {
        return null;
    }
    public Icon getIcon(File f)
    {
        String extension=getExtensionName(f);
        if(extension.equals("java"))
        {
            return new ImageIcon(".\\b1.jpg");
        }
        if(extension.equals("txt"))
        {
            return new ImageIcon(".\\b2.jpg");
        }
        return null;
    }
}