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    <p><a href="http://grepcode.com/file/repository.grepcode.com/java/root/jdk/openjdk/6-b14/java/util/Scanner.java#Scanner.hasNextLine%28%29" rel="noreferrer">hasNextLine()</a> calls <a href="http://grepcode.com/file/repository.grepcode.com/java/root/jdk/openjdk/6-b14/java/util/Scanner.java#Scanner.findWithinHorizon%28java.util.regex.Pattern,int%29" rel="noreferrer">findWithinHorizon()</a> which in turns calls <a href="http://grepcode.com/file/repository.grepcode.com/java/root/jdk/openjdk/6-b14/java/util/Scanner.java#Scanner.findPatternInBuffer%28java.util.regex.Pattern,int%29" rel="noreferrer">findPatternInBuffer()</a>, searching a match for a line terminator character pattern defined as <code>.*(\r\n|[\n\r\u2028\u2029\u0085])|.+$</code></p> <p>Strange thing is that with both ways to construct a Scanner (with FileInputStream or via File), findPatternInBuffer returns a positive match if the file contains (independently from file size) for instance the 0x0A line terminator; but in the case the file contains a character out of ascii (ie >= 7f), using FileInputStream returns true while using File returns false.</p> <p>Very simple test case:</p> <p>create a file which contains just char "a"</p> <pre><code># hexedit file 00000000 61 0A a. # java Test.java using File: true using FileInputStream: true </code></pre> <p>now edit the file with hexedit to:</p> <pre><code># hexedit file 00000000 61 0A 80 a.. # java Test.java using File: false using FileInputStream: true </code></pre> <p>in the test java code there is nothing else than what already in the question:</p> <pre><code>import java.io.*; import java.lang.*; import java.util.*; public class Test { public static void main(String[] args) { try { File file1 = new File("file"); Scanner s1 = new Scanner(file1); System.out.println("using File: "+s1.hasNextLine()); File file2 = new File("file"); Scanner s2 = new Scanner(new FileInputStream(file2)); System.out.println("using FileInputStream: "+s2.hasNextLine()); } catch (IOException e) { e.printStackTrace(); } } } </code></pre> <p>SO, it turns out this is a charset issue. In facts, changing the test to:</p> <pre><code> Scanner s1 = new Scanner(file1, "latin1"); </code></pre> <p>we get:</p> <pre><code># java Test using File: true using FileInputStream: true </code></pre>
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    1. POJava Scanner(File) misbehaving, but Scanner(FIleInputStream) always works with the same file
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    1. USᴳᵁᴵᴰᴼ
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    1. POJava Scanner(File) misbehaving, but Scanner(FIleInputStream) always works with the same file
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    1. COInteresting. When looking at the `Scanner` contrustors they all seem to be assuming the default charset if not specified, yet there's a difference at runtime as you point out. Maybe the channel used internally maybe force a different one, one level deeper? I'm wondering... Will try check when I get a chance.
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