Combine Or Merge 2 Sorted Maps Into 1 Based On Common Key?

I have a small problem to solve by which I would like to merge 2 sorted maps into 1.

Map A
-------
Keys, Values
1, A
2, B
3, C
4, D
5, E

Map B
-------
Keys, Values
1, 10
2, 20
3, 30
4, 40
5, 50

Final Map should look like:

Keys, Values
A, 10
B, 20
C, 30
D, 40
E, 50

The final map would have all the values from Map A as a key and the values from Map B as values in the Final Map. Is there a way to do this using Java?