Indegree and outdegree

public HashMap<Vertex, Integer> Indegree ( ) {
        HashMap <Vertex, Integer> degrees = new HashMap <Vertex, Integer> ( );

        for ( Vertex v : this.adjacencyMap.keySet() )
            degrees.put( v, 0 );

        for ( Vertex v : this.adjacencyMap.keySet() )
            for ( Vertex inV : this.adjacencyMap.get( v ).keySet() )
                degrees.put( inV , degrees.get(inV) + 1 );

        return degrees;
}

public HashMap<Vertex, Integer> Outdegree ( ) {
        HashMap<Vertex, Integer> outDegrees = new HashMap<Vertex, Integer>( );

        for ( Vertex v : this.adjacencyMap.keySet() )
            outDegrees.put( v, this.adjacencyMap.get(v).size() );

        return outDegrees;
}