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Perfect annotation based library to read and write excel files

There is a newer version: 1.5.0

package com.poiji.util;

/**
 * Created by hakan on 17/01/2017.
 */
public final class Files {

    private static final Files instance = new Files();

    public static Files getInstance() {
        return instance;
    }

    private Files() {
    }

    public String getExtension(String fileName) {
        int i = fileName.lastIndexOf('.');
        if (i >= 0) {
            return fileName.substring(i);
        }
        return "";
    }
}