W3School TIY Editor

import java.io.File; public class GetFileInfo { public static void main(String[] args) { File myObj = new File("filename.txt"); if (myObj.exists()) { System.out.println("文件名: " + myObj.getName()); System.out.println("绝对路径: " + myObj.getAbsolutePath()); System.out.println("可写: " + myObj.canWrite()); System.out.println("可读: " + myObj.canRead()); System.out.println("文件大小(字节): " + myObj.length()); } else { System.out.println("文件不存在"); } } }