src/java.base/share/classes/java/io/Reader.java

*** 61,77 ****
       * {@code close()} method.  Subsequent calls to {@code close()} have no
       * effect.
       *
       * <p> While the stream is open, the {@code read()}, {@code read(char[])},
       * {@code read(char[], int, int)}, {@code read(Charbuffer)}, {@code
!      * ready())}, {@code skip(long)}, and {@code transferTo()} methods all
       * behave as if end of stream has been reached.  After the stream has been
       * closed, these methods all throw {@code IOException}.
       *
       * <p> The {@code markSupported()} method returns {@code false}.  The
!      * {@code mark()} method does nothing, and the {@code reset()} method
!      * throws {@code IOException}.
       *
       * <p> The {@link #lock object} used to synchronize operations on the
       * returned {@code Reader} is not specified.
       *
       * @return a {@code Reader} which reads no characters
--- 61,76 ----
       * {@code close()} method.  Subsequent calls to {@code close()} have no
       * effect.
       *
       * <p> While the stream is open, the {@code read()}, {@code read(char[])},
       * {@code read(char[], int, int)}, {@code read(Charbuffer)}, {@code
!      * ready()}, {@code skip(long)}, and {@code transferTo()} methods all
       * behave as if end of stream has been reached. After the stream has been
       * closed, these methods all throw {@code IOException}.
       *
       * <p> The {@code markSupported()} method returns {@code false}.  The
!      * {@code mark()} and {@code reset()} methods throw an {@code IOException}.
       *
       * <p> The {@link #lock object} used to synchronize operations on the
       * returned {@code Reader} is not specified.
       *
       * @return a {@code Reader} which reads no characters
*** 113,122 ****
--- 112,127 ----
                  }
                  return 0;
              }
  
              @Override
+             public boolean ready() throws IOException {
+                 ensureOpen();
+                 return false;
+             }
+ 
+             @Override
              public long skip(long n) throws IOException {
                  ensureOpen();
                  return 0L;
              }