Collection Typearraysetdictionarycollection type use are generic, the type of element is specific.ArrayWith ordering.Access by subscript.Variable-length. {代码…} Create by class {代码…} result:[0.0, 0.0, 0.0] [2.5, 2.5, 2.5] [0.0, 0.0, 0.0, 2.5, 2.5, 2.5]Create By Array Literal {代码…} {代…