Track nio API change.

    method public java.nio.CharBuffer put(java.lang.String, int, int);

    method public int read(java.nio.CharBuffer) throws java.io.IOException;

    method public abstract java.nio.CharBuffer slice();

    method public abstract java.lang.CharSequence subSequence(int, int);

    method public abstract java.nio.CharBuffer subSequence(int, int);

    method public static java.nio.CharBuffer wrap(char[]);

    method public static java.nio.CharBuffer wrap(char[], int, int);

    method public static java.nio.CharBuffer wrap(java.lang.CharSequence);