util. Stack. peek() method in Java is used to retrieve or fetch the first element of the Stack or the element present at the top of the Stack. The element retrieved does not get deleted or removed from the Stack.Click to see full answer. Also to know is, what are stacks used for in Java?A stack is a data structure that allows data to be inserted (a ‘push’ operation), and removed (a ‘pop’ operation). Many stacks also support a read ahead (a ‘peek’ operation), which reads data without removing it. A stack is a LIFO-queue, meaning that the last data to be inserted will be the first data to be removed. what is the difference between the stack pop and peek operations? In general programming terms, “pop” means the method of returning an object from a stack, while at the same time removing it from the stack. The term “peek” is more generic and can be used on other data containers/ADTs than stacks. “Peek” always means “give me the next item but do not remove it from the container”. Thereof, what is Peek function? In computer science, peek is an operation on certain abstract data types, specifically sequential collections such as stacks and queues, which returns the value of the top (“front”) of the collection without removing the element from the collection.What is Peep stack?Peep is a basic operation that can be performed on stack. Operations on STACK : Basic operations required to manipulate a stack are: PUSH : To insert an item into the stack. POP : To remove an item from a stack.