为什么在Java中收到EOF异常？

Question

I wrote the following method to read a file, search for a certain character "$", and return a boolean indicating whether it is present or not. For some reason, I keep getting a EOFException at line 224, where it simply says "s = raf.readUTF". All I'm doing is reading the records and adding them to an array list. Here is the code:

    public boolean buildComparisonArray(String passedPath) throws FileNotFoundException, IOException{
    ArrayList<String> comparisonArray = new ArrayList<String>();
    boolean unwantPresent = false;
    File file = new File(passedPath);
    RandomAccessFile raf = new RandomAccessFile(file, "r");
    raf.seek(0);
    long num = 0;
    long fileSize = 0;
    int record = 0;
    fileSize = raf.length();
        record = 160;
        num = fileSize/record;
        String s = "", s2 = "", s3="",s4="",s5="",s6="",s7="",s8="";
    long currentPositionOfFilePointer;
    for(int i=0; i<num; i++){
            currentPositionOfFilePointer = raf.getFilePointer();
            System.out.println("Current: "+currentPositionOfFilePointer);
            s = raf.readUTF();
            comparisonArray.add(s);
            System.out.println("Found in file: "+s);
            for(int j=0; j<20-s.length();j++){
                raf.readByte();
            }
            s2 = raf.readUTF();
            comparisonArray.add(s2);
             System.out.println("Found in file: "+s2);
            for(int j=0; j<20-s2.length();j++){
               raf.readByte();
            } 
            s3 = raf.readUTF();
            comparisonArray.add(s3);
             System.out.println("Found in file: "+s3);
            for(int j=0; j<20-s2.length();j++){
               raf.readByte();
            }
            s4 = raf.readUTF();
            comparisonArray.add(s4);
            System.out.println("Found in file: "+s4);
            for(int j=0; j<20-s2.length();j++){
               raf.readByte();
            }
            s5 = raf.readUTF();
            comparisonArray.add(s5);
            System.out.println("Found in file: "+s5);
            for(int j=0; j<20-s2.length();j++){
               raf.readByte();
            }
            s6 = raf.readUTF();
            comparisonArray.add(s6);
            System.out.println("Found in file: "+s6);
            for(int j=0; j<20-s2.length();j++){
               raf.readByte();
            }
            s7 = raf.readUTF();
            comparisonArray.add(s7);
            System.out.println("Found in file: "+s7);
            for(int j=0; j<20-s2.length();j++){
               raf.readByte();
            }

            s8 = raf.readUTF();
            comparisonArray.add(s8);
            System.out.println("Found in file: "+s8);
            for(int j=0; j<20-s2.length();j++){
               raf.readByte();
            }
        }
    raf.close();
    for(String j: comparisonArray){
        if(j.contains("$")){
            unwantPresent = true;
        }else if(!j.contains("$")){
            unwantPresent = false;
        }
    }
    return unwantPresent;
}

All i'm trying to do is read through a random access file of one line and check whether or not the "$" symbol is present.

Answer 1

After you read s2 u forgot to change s2 to s3, s2 to s4 and so on in your for-instruction

s2 = raf.readUTF();
comparisonArray.add(s2);
 System.out.println("Found in file: "+s2);
for(int j=0; j<20-s2.length();j++){
   raf.readByte();
} 
s3 = raf.readUTF();
comparisonArray.add(s3);
 System.out.println("Found in file: "+s3);
for(int j=0; j<20-s2.length();j++){
   raf.readByte();
}