jpgfilter.java

一个简单的绘图程序

package grapro;
import javax.swing.filechooser.*;
import java.io.File;
public class JPGFilter extends FileFilter
{   String suffix;
	public JPGFilter()
	{
	}
	public boolean accept(File f)
	{
		boolean acc=f.isDirectory();
		if(!acc)
		{suffix=getSuffix(f);
		}
		if(suffix!=null)
		{
			acc=suffix.equals("jpg");
		}
		return acc;
	}
	public String getDescription()
	{
		return "JPG Files (*.jpg)";
	}
	public String getSuffix(File f)
	{
		String s=f.getPath();
		String suffix=null;
		int i=s.lastIndexOf('.');
		suffix=s.substring(i+1).toLowerCase();
		return suffix;
	}
}