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Java: String Comparison between FileOutputStream and ByteArrayOutputStream

I have a piece of code that writes to a file using a DataOutputStream wrapped around a FileOutputStream, and writes to a string using a DataOutputStream wrapped around a ByteArrayOutputStream, both using the writeDouble() method.

I then try to read from the file and compare what is read from the file, to the string,(BufferedReader wrapped around a StringReader wrapped around b(ByteArrayOutputStream).toString(), and BufferedReader wrapped around a FileReader) and get the same result.

Even though 

System.out.println(StrRead1.toString())

and 

System.out.println(StrRead2.toString())

print the same thing in the terminal, when I compare the two using 

(StrRead1.toString().equals(StrRead2.toString()))

they are never equal.(Str1 and Str2 being StringBuilders)

Can somebody give me a hand? Thanks.

Solution

  • The result of writeDouble() is binary. You have no business trying to turn the result into a String, or read that data with a Reader. Use an InputStream and compare the bytes. Or use a DataInputStream and compare the result of readDouble() in each case.

    But I really have no idea why you're doing this. writeDouble() is writeDouble(). It does the same thing, regardless of what output stream it's connected to.