Index: /luni/src/main/java/java/lang/StringBuffer.java =================================================================== --- /luni/src/main/java/java/lang/StringBuffer.java (revision 395760) +++ /luni/src/main/java/java/lang/StringBuffer.java (working copy) @@ -15,7 +15,6 @@ package java.lang; - import java.io.IOException; import java.io.InvalidObjectException; import java.io.ObjectInputStream; @@ -41,8 +40,7 @@ * @see StringBuilder * @since 1.0 */ -public final class StringBuffer implements Serializable, CharSequence { - //TODO: Add 'Appendable' to implements when return type covariance is supported. +public final class StringBuffer implements Appendable, Serializable, CharSequence { private static final long serialVersionUID = 3388685877147921107L;