android/guava/src/com/google/common/collect/ImmutableTable.java
@CanIgnoreReturnValue
  @Deprecated
  @Override
  public final V remove(Object rowKey, Object columnKey) {
    throw new UnsupportedOperationException();
  }
@CanIgnoreReturnValue
  @Deprecated
  @Override
  public final V remove(Object rowKey, Object columnKey) {
    throw new UnsupportedOperationException();
  }
@ CanIgnoreReturnValue @ Deprecated @ Override public final V remove ( Object rowKey , Object columnKey ) { throw new UnsupportedOperationException ( ) ; }
Guaranteed to throw an exception and leave the table unmodified.

@throws UnsupportedOperationException always
@deprecated Unsupported operation.
Guaranteed to throw an exception and leave the table unmodified .