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Editorial Team
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Asked: 2026-06-03T11:09:59+00:00

I started working on Android applications and I find little difficult to understand this

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I started working on Android applications and I find little difficult to understand this piece of code:

LineNumberReader(new FileReader("/proc/tty/drivers"));

How can I know that the LineNumberReader function accepts FileReader as a new instance of the class? I went through the Java documentation for the LineNumberReader API, it doesn’t mention anything regarding FileReader class. There is problem in Java API interpretation which I have to consider, Can any one of you please help me in understanding how an API should be used in Java?

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1 Answer

  1. Editorial Team

    I suspect you actually saw:

    new LineNumberReader(new FileReader("..."))

    The LineNumberReader documentation shows a constructor taking a Reader parameter, and FileReader extends Reader. So think of it like this:

    Reader reader = new FileReader("/proc/tty/drivers");
LineNumberReader lineNumberReader = new LineNumberReader(reader);

    Is that clearer for you?

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