Java编程实现判断网上邻居文件是否存在的方法

package test;import java.io.File;public class FileCheck { /** * @param args */ public static void main(String[] args) { String filename="d://test.xml"; filename="o://test.xml"; filename="o://t"; filename="o://学习//学习.txt"; File f=new File(filename); if (f.exists()) {  if (f.isFile())  {  System.out.println("is file exist ");  }  else  {  System.out.println("is folder exist ");  } } else {  System.out.println("no"); } System.out.println(checkFileExist(filename)); } public static boolean checkFileExist(String filename) { //String filename="d://test.xml"; //filename="o://test.xml"; File f=new File(filename); if (f.exists()) {  System.out.println("filename:"+filename+" exist");  return true; } else {  System.out.println("filename:"+filename+" not exist");  return false; } }}