In Lorraine Hansberry's A Raisin in the Sun, how does the character Walter Lee evolve from beginning of the text to the end?

In Hansberry's
,changes from the beginning to the end. In the beginning, Walter is a
bitter black man. He feels that life is not fair. He is angry because he cannot seem to get
ahead. He is dissatisfied with his job. Working as a chauffeur is demeaning to him.

Walter lives in an apartment that is disappointing. He is surrounded by strong women
who are quite vocal. He and his wifeargue:

Ruth: Eat your
eggs, they gonna be cold.

Walter: Thats it. There you are. Man say to his
woman: I got me a dream. His woman say: Eat your eggs...Man say: I got to take hold of this
here...