What are the differences between Arrays and Collections

• Arrays are fixed in size, therefore once we create an array we are not allowed to increase or decrease its size, based on the requirement. Collections are grow-able, therefore base on our requirement we can increase or decrease its size
• Arrays use more memory space as compared to Collections
• Performance point of view arrays are recommended (Faster), where as collections are not recommended
• Arrays can hold only homogeneous elements, collections can hold both homogeneous and heterogeneous elements
• Arrays can hold both primitives as well as objects, where as collection can not hold primitives (although they can store primitive wrapper classes such as Integer etc)
• In Array , there are no underlined Data Structures, whereas ,Collection has Underlined DS