myfilter.java

自己编写的一个用于查找java类所在包的完整源程序,编程环境是Eclipse+JDK1.5.压缩包中包括了帮助(运行后也可以查看帮助菜单).是windows风格的运行界面.建议您自己做一个可双击运行的

package mypack;

import java.io.File;
import java.util.Hashtable;
import javax.swing.filechooser.*;

public class MyFilter extends FileFilter {

	private Hashtable filters = null;
	private String description = null;

	public MyFilter() {
		this.filters = new Hashtable();
	}

	public MyFilter(String extension, String description) {
		this();
		if(extension!=null) addExtension(extension);
		if(description!=null) setDescription(description);
	}

	public MyFilter(String[] filters, String description) {
		this();
		for (int i = 0; i < filters.length; i++) {
		    // add filters one by one
		    addExtension(filters[i]);
		}
	 	if(description!=null) setDescription(description);
	    }
	
	public boolean accept(File f) {
		if(f != null) {
			if(f.isDirectory()) {
				return true;
			}
			String extension = getExtension(f);
			if(extension != null && filters.get(getExtension(f)) != null) {
				return true;
			};
		}
		return false;
	}

	public String getExtension(File f) {
		if(f != null) {
			String filename = f.getName();
			int i = filename.lastIndexOf('.');
			if(i>0 && i<filename.length()-1) {
				return filename.substring(i+1).toLowerCase();
			};
		}
		return null;
	}

	public void addExtension(String extension) {
		if(filters == null) {
			filters = new Hashtable(5);
		}
		filters.put(extension.toLowerCase(), this);
	}

	public String getDescription() {
		if(this.description==null)
			return null;
		return this.description;
	}

	public void setDescription(String description) {
		this.description = description;
	}

}