public void removeAt(int index){
  System.arraycopy(mKeys,index + 1,mKeys,index,mSize - (index + 1));
  System.arraycopy(mValues,index + 1,mValues,index,mSize - (index + 1));
  mSize--;
}

public void removeAt ( int index ) { System . arraycopy ( mKeys , index + 1 , mKeys , index , mSize - ( index + 1 ) ) ; System . arraycopy ( mValues , index + 1 , mValues , index , mSize - ( index + 1 ) ) ; mSize -- ; }
removes the mapping at the given index .
