Biegral Blog

import java.io.File;

public class Test {

	/**
	 *author: itmyhome
	 */
	public static void main(String[] args) {
		File file = new File("HelloWorld.java");
		String fileName = file.getName();
		String suffix = fileName.substring(fileName.lastIndexOf(".") + 1);
		System.out.println(suffix);
	}
}

作者：itmyhome