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;
 }
 }
}