看JAVA IO流

public class File_test1 {     public static void main(String[] args) {         File f = new File("E:", "a.txt");         try {             if (f.exists()) {                 System.out.println("檔案存在！");                 System.out.println("檔案名稱:"                        + f.getName()                                 .substring(0, f.getName().lastIndexOf('.')));                 System.out.println("檔案相對路徑:" + f.getPath()); // 相對路徑                 System.out.println("檔案相對路徑:" + f.getAbsolutePath()); // 絕對路徑                 System.out.println("檔案父親目錄:" + f.getParent());                 File p = f.getParentFile();// 擷取父目錄檔案                 System.out.println("父目錄絕對路徑:" + p.getAbsolutePath());                 System.out.print("檔案讀取許可權:");                 System.out.println(f.canRead() ? "可讀" : "不可讀");                 System.out.print("是否可寫:");                 System.out.println(f.canWrite() ? "可寫" : "不可寫");                 System.out.print("是否目錄:");                 System.out.println(f.isDirectory() ? "是" : "否");                 System.out.print("是否檔案：");                 System.out.println(f.isFile()?"是":"否");                 System.out.print("是否隱藏：");                 System.out.println(f.isHidden()?"是":"否");                 System.out.println("檔案長度:"+f.length());               } else {                 System.out.println("檔案不存，將建立檔案");                 f.createNewFile();             }         } catch (Exception e) {             // TODO: handle exception             System.out.println(e.getMessage());         }       } }