180个针对Java初学者的简单实例180个针对Java初学者的简单实例180个针对Java初学者的简单实例

				//运用File类的常用方法，获取有关文件属性的信息。
				import java.io.File;
				class FileDemo 
				{
				  static void OutOper(String s)
				 {
				    System.out.println(s);
				  }
				  public static void main(String args[]) {
				    File f1 = new File("/java/COPYRIGHT");
					//调用File类的toString方法输出对象f1的路径
					System.out.println(f1);
					//获取该文件的各个属性和信息
				    OutOper("File Name: " + f1.getName());
				    OutOper("Path: " + f1.getPath());
				    OutOper("Abs Path: " + f1.getAbsolutePath());
				    OutOper("Parent: " + f1.getParent());
				    OutOper(f1.exists() ? "exists" : "does not exist");
				    OutOper(f1.canWrite() ? "is writeable" : "is not writeable");
				    OutOper(f1.canRead() ? "is readable" : "is not readable");
				    OutOper("is " + (f1.isDirectory() ? "" : "not" + " a directory"));
				    OutOper(f1.isFile() ? "is normal file" : "might be a named pipe");
				    OutOper(f1.isAbsolute() ? "is absolute" : "is not absolute");
				    OutOper("File last modified: " + f1.lastModified());
				    OutOper("File size: " + f1.length() + " Bytes");
					//将 f1对象改名为"newFile"
					File f2 = new File("newFile");
					OutOper("\n"+"****now rename the file " + f1 +" to " +f2 +"****");
					f1.renameTo(f2);
					OutOper("name"+f2.getName());
					//检查改名前的那个文件是否存在
					OutOper(f1+"is exist?" +f1.exists());
					//删除改名后的文件
					OutOper("\n"+"****delete"+f2+"****");
					f2.delete();
					OutOper(f2 + "exist?" + f2.exists());
				  }
				}