txtfilter.java

来自「模 拟 飞 机 飞 行 服 务 端」· Java 代码 · 共 51 行

package filter;

import java.io.File;

import javax.swing.filechooser.FileFilter;

public class TxtFilter extends FileFilter {

    private static TxtFilter instance;

    protected TxtFilter() {
    }

    public static TxtFilter newInstance() {
        if (instance == null) {
            instance = new TxtFilter();
        }
        return instance;
    }

    @Override
    public boolean accept(File f) {
        if (f.isDirectory()) {
            return true;
        }
        String ext = getExtension(f);
        if (ext != null && "txt".equals(ext)) {
            return true;
        } else {
            return false;
        }
    }

    @Override
    public String getDescription() {
        return "*.txt";
    }

    public static String getExtension(File f) {
        String ext = null;
        String s = f.getName();
        int i = s.lastIndexOf('.');

        if (i > 0 && i < s.length() - 1) {
            ext = s.substring(i + 1).toLowerCase();
        }
        return ext;
    }

}