To what Extent Does Hamlet Retain His Sanity after Claiming to Put an Antic Disposition on?

In William Shakespeare's Hamlet, Hamlet claims, "to put an antic disposition on." He maintains this false sense of madness throughout the play, though his sanity is put into question by other characters. His selective 'madness', self-belief in his sanity, and the reasons he holds for his 'mad' outbursts and his lunacy in general reflect his sanity. Hamlet deals with issues such as the confliction of values, life, murder, the afterlife, madness, revenge, death and love.
Hamlet is a classic play of the revenge tragedy genre. Hamlet, the central character, is the Prince of Denmark, son of the late King Hamlet and Gertrude who married Claudius (Her late husband's brother) shortly after King Hamlet's death. The ghost of King Hamlet appears to his son and tells him that Claudius murdered him. Hamlet must seek revenge for his father's death, to maintain the family's honour. …