Lemon Jell-O Salad with Pineapple, Cheese, and Nuts

1 small can Crushed Pineapple (drained)
1/2 cup Sugar
1 package Lemon or Orange Jell-O
1 cup Water
1/2 cup Walnuts
1 cup Cheddar Cheese
1 cup Cool Whip

Bring the pineapple and sugar to a boil, then add the jell-o and water. Cook until dissolved. Chill until it starts to set and then add nuts, cheese, and whipped cream. Refrigerate before and after serving.