import java.io.File;
import java.io.FilenameFilter;
import java.util.ArrayList;
import java.util.List;

public class FilterFileTest implements FilenameFilter{
    String suffix;


    public FilterFileTest(String suffix) {
        super();
        this.suffix = suffix;
    }

    public String getSuffix
 
() {
        return suffix;
    }
    public void setSuffix(String suffix) {
        this.suffix = suffix;
    }

    public List<File> getFileList(FilterFileTest filter,File dir,List<File> listFile) {
        File[] files = dir.listFiles();

        for(File file : files) {
            if
 
(file.isDirectory()) {
                getFileList(filter,file,listFile);
            } else {
                if(accept(file.getParentFile(),file.getName())) {
                    listFile.add(file);
                }
            }
        }
        return listFile;
    }

    public boolean accept
 
(File dir, String filePath) {
        boolean bool =  false;

        File file = new File(filePath);
        if(file.getName().endsWith(this.suffix)) {
            bool = true;
        }
        return bool;

    }

    public static void main(String[] args) {
        File dir = new File("G:\\test");
        String suffix = ".pdf";
        ArrayList<File> fileList = new ArrayList<File>();
        FilterFileTest test = new FilterFileTest(suffix);
        test.getFileList(test, dir, fileList);


        for(File file : fileList) {
            System.out.println(file.getPath());
        }
    }
}

**注意：FilenameFilter的accept方法通常在呼叫file.listFiles(FilenameFilter filter)或file.list(FilenameFilter filter)時
由系統呼叫**