通过File类在计算机上创建制定的文件

import java.io.File;public class hehe {public static void main(String[]  args){String sep = File.separator;String filename = "DDqd.txt";String dir = "D:"+sep;File f = new File(dir,filename);if(f.exists()){System.out.println("Filename:"+f.getAbsolutePath());System.out.println("Large:"+f.length());}else{try{f.createNewFile();}catch(Exception ar){ar.printStackTrace();}}}}