CODEWITHSUNDEEP
javajava-io
user2002858
user2002858

Reputation: 359

Read text files into 2D array?

I want to read a list of text files into a 2D array. The code throws a run time error on reading into the array. How can I fix this?

  public static void main(String[] args) throws IOException
   {    
   byte[][] str = null;
   File file=new File("test1.txt");
   str[0]= readFile1(file);

   File file2=new File("test2.txt");
   str[1]= readFile1(file2);
  }

 public static byte[] readFile1 (File file) throws IOException {

    RandomAccessFile f = new RandomAccessFile(file, "r");

    try {    
        long longlength = f.length();
        int length = (int) longlength;
        if (length != longlength) throw new IOException("File size >= 2 GB");

        byte[] data = new byte[length];
        f.readFully(data);
        return data;
    }
    finally {
        f.close();
      }
    }

Upvotes: 0

Views: 306

Answers (1)

Jim Garrison
Jim Garrison

Reputation: 86774

To begin with

byte[][] str = null;
File file=new File("test1.txt");
str[0]= readFile1(file);

the last statement will throw NullPointerException since str is null at this point. You need to allocate the array:

byte[][] str = new byte[2][];

Upvotes: 2

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