LineNumberReader.getLineNumber() returns inconsistent results after EOF

A DESCRIPTION OF THE PROBLEM :
LineNumberReader.getLineNumber() returns inconsistent results after reaching EOF depending on the methods which were called to read.

readLine() always returns a line number one higher than if EOF has been reached using the other methods.


---------- BEGIN SOURCE ----------
import java.io.IOException;
import java.io.LineNumberReader;
import java.io.StringReader;

public class EofLineNumberTest {
    public static void main(String[] args) throws IOException {
        String string = "first \n second";
        /*
         * getLineNumber() is described as "Get the current line number."
         * However, the result is inconsistent after EOF
         */
        System.out.println("Line number after EOF:");
        System.out.println(" read(): " + linesRead(string));
        System.out.println(" read(char[]): " + linesReadBuffer(string));
        System.out.println(" readLine(): " + linesReadLine(string));
    }
    
    private static int linesRead(String string) throws IOException {
        LineNumberReader reader = new LineNumberReader(new StringReader(string));
        while (reader.read() != -1) { }
        
        return reader.getLineNumber();
    }
    
    private static int linesReadBuffer(String string) throws IOException {
        LineNumberReader reader = new LineNumberReader(new StringReader(string));
        char[] buff = new char[512];
        while (reader.read(buff) != -1) { }
        
        return reader.getLineNumber();
    }
    
    private static int linesReadLine(String string) throws IOException {
        LineNumberReader reader = new LineNumberReader(new StringReader(string));
        while (reader.readLine() != null) { }
        
        return reader.getLineNumber();
    }
}

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FREQUENCY : always