filetest.java

java I/0流的代码程序

import java.io.*;

public class FileTest
{
  public static void main(String[] argv)
  {
    File file = new File("aaa.txt");
    if(file.exists())
    {
      System.out.println(file.getName() + " exists\n");
      if (file.isFile()) System.out.println(file.getName() + " is a file\n");
      else System.out.println(file.getName() + " is not a file\n");
      if (file.isDirectory()) System.out.println(file.getName() + " is a directory\n");
      else System.out.println(file.getName() + " is not a directory\n");
      if (file.isAbsolute()) System.out.println(file.getName() + " is a absolute path\n");
      else System.out.println(file.getName() + " is not a absolute path\n");
      System.out.println("last modified time is:"+file.lastModified() + "\n");
    }
    else System.out.println(file.getName() + "does not exists\n");
    if(file.isFile())
    {
      try
      {
        BufferedReader input = new BufferedReader(new FileReader(file));
        StringBuffer buffer = new StringBuffer();
        String text = null;
        System.out.println("File contents is:");
        while(( text = input.readLine()) != null)
          buffer.append(text+"\n");
        System.out.println(buffer.toString());
      }catch(IOException e){}
    }
    else if(file.isDirectory())
    {
      String directory[] = file.list();
      System.out.println("Directory contents:");
      for(int i=0;i<directory.length;i++)
        System.out.println(directory[i]);
    }
  }
}