import java.io.*;
public class FileDemo1 {

    public static void main(String[] args)throws Exception {
       int size;
       InputStream f=new FileInputStream("FileDemo1.java");
       System.out.println("Total Aviable Bytes:"+(size=f.available()));
       int n=size/40;
      System.out.println("First"+n+"bytes of file one read() at a time");
      for(int i=0;i<n;i++){
      System.out.println(f.read());    
      }
      System.out.println("\nStill Avaible:"+f.available());
      System.out.println("Reading the next"+n+"with one read()");
      byte b[]=new byte[n];
      if(f.read(b)!=n){
      System.err.println("couldn't read"+n+"bytes");    
      }
      System.out.println(new String(b,0,n));
      System.out.println("nStill Avaible:"+(size=f.available()));
      System.out.println("Skipping half of remaining bytes with skip()");
      f.skip(size/2);
      System.out.println("Still Avaible:"+f.available());
      System.out.println("Reading"+n/2+"into the end of array");
      if(f.read(b,0,n/2)!=n/2){
          System.out.println("couldn't read"+n/2+"bytes");
      }
      System.out.println(new String(b,0,n/2));
      System.out.println("\nStill Avaible:"+f.available());
      f.close();
    }
    
}

cargo wrote:
那俩表情图片是什么源码？

whhxtt wrote:
我用Eclipse3.01运行的啊。它提示这样的错误：java.io.FileNotFoundException: FileDemo1.java (系统找不到指定的文件。)
  at java.io.FileInputStream.open(Native Method)
  at java.io.FileInputStream.<init>(Unknown Source)
  at java.io.FileInputStream.<init>(Unknown Source)
  at FileDemo1.main(FileDemo1.java:19)
Exception in thread "main"

这是怎么一回事呢？小弟初学，很困惑。