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Asked: 2026-06-07T00:14:34+00:00

In a method I need a BufferedReader wrapping a DataInputStream as a parameter. I

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In a method I need a BufferedReader wrapping a DataInputStream as a parameter. I want to declare the method as this :

public void firstPass(BufferedReader inStream){ // some code ... }

But I don’t know how I can check whether inStream is wrapping a DataInputStream.

I’ve tried

public static void firstPass(BufferedReader inStream){
    if (inStream instanceof DataInputStream){

    }       
}

but the code can’t compile (Eclispe does not accept the code : “Incompatible conditional operand types BufferedReader and DataInputStream”).

Why this need ? Because I want to use with the same variable inStream :

  • the method readLine() from BufferedReader
  • the method readDouble() from DataInputStream

So I need a stream which chains both classes.

I’m programming with Java 7 JDK.

Could someone help me please ? Thanks in advance.

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1 Answer

  1. Editorial Team

    A DataInputStream can never be a instance of BufferedReader – they are both in separate class hierarchies.

    A BufferedReader wraps another Reader, not a Stream.

    You can bridge from Streams to Readers using an InputStreamReader.

    Reading doubles and lines from the same Reader doesn’t really makes sense – one is raw binary data, the other is character data. Maybe you need to read a textual encoding of the doubles, and parse this using Double.parseDouble(text).

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