A DESCRIPTION OF THE PROBLEM :
Only LineNumberReader.read() compresses \r\n to \n. For its other methods this behavior is not documented. This is also confirmed by this ([0]) evaluation comment on JDK-6498795. However, read(char[] cbuf, int off, int len) actually sets skipLF and therefore affects read()'s behavior. Expected would be that read(char[], ...) only clears skipLF and then uses a local variable to track line terminators.

[0] https://bugs.openjdk.java.net/browse/JDK-6498795?focusedCommentId=12139576#comment-12139576


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import java.io.IOException;
import java.io.LineNumberReader;
import java.io.StringReader;

public class ReadSkipLfTest {
    public static void main(String[] args) throws IOException {
        String string = "\r\n";
        LineNumberReader reader = new LineNumberReader(new StringReader(string));
        
        // read(char[]) is not described as compressing \r\n, so it should just read 
        // \r and then subsequent read() should read \n
        reader.read(new char[1]);
        
        if (reader.read() == -1) {
            throw new AssertionError("Expected \\n");
        }
    }
}

---------- END SOURCE ----------

FREQUENCY : always