java2参考大全上的例子的源码和自己的理解.

				package file方法;
				
				/**
				 File Name: COPYRIGHT.txt
				 Path: java\COPYRIGHT.txt
				 Abs Path: D:\JAVA Programe\File方法\java\COPYRIGHT.txt
				 Parent: java
				 exists
				 is writeable
				 is readable
				 is not a directory
				 is normal file
				 is not absolute
				 File last modified: 1110179708000
				 File size: 54 Bytes
				 */
				
				// Demonstrate File.
				import java.io.File;
				
				class FileDemo {
				  static void p(String s) {
				    System.out.println(s);
				  }
				
				  public static void main(String args[]) {
				//    File f1 = new File("D:/JAVA Programe/File方法/java/COPYRIGHT.txt");
				    File f1 = new File("java/COPYRIGHT.txt");
				    p("File Name: " + f1.getName());
				    p("Path: " + f1.getPath());
				    p("Abs Path: " + f1.getAbsolutePath());
				    p("Parent: " + f1.getParent());
				    p(f1.exists() ? "exists" : "does not exist");
				    p(f1.canWrite() ? "is writeable" : "is not writeable");
				    p(f1.canRead() ? "is readable" : "is not readable");
				    p("is " + (f1.isDirectory() ? "" : "not" + " a directory"));
				    p(f1.isFile() ? "is normal file" : "might be a named pipe");
				    p(f1.isAbsolute() ? "is absolute" : "is not absolute");
				    p("File last modified: " + f1.lastModified());
				    p("File size: " + f1.length() + " Bytes");
				  }
				}