Drain pineapple, reserving 1 cup juice in a small saucepan. Set pineapple aside. To saucepan, add sugar, flour, eggs, orange juice, lemon juice, and oil. Bring to a boil, stirring constantly. Boil for 1 min.; remove from heat and let cool. In a salad bowl combine the pineapple, fruit cocktail, oranges and bananas. Fold in the whipped cream and cooled sauce. Chill for several hours.