public classStack<E>extendsVector<E>
Stack class represents a last-in-first-out (LIFO) stack of objects. It extends classVector with five operations that allow a vector to be treated as a stack. The usualpush andpop operations are provided, as well as a method topeek at the top item on the stack, a method to test for whether the stack isempty, and a method tosearch the stack for an item and discover how far it is from the top.When a stack is first created, it contains no items.
A more complete and consistent set of LIFO stack operations is provided by theDeque interface and its implementations, which should be used in preference to this class. For example:
Deque<Integer> stack = new ArrayDeque<Integer>();capacityIncrement,elementCount,elementDatamodCount| Constructor | Description |
|---|---|
Stack() | Creates an empty Stack. |
| Modifier and Type | Method | Description |
|---|---|---|
boolean | empty() | Tests if this stack is empty. |
E | peek() | Looks at the object at the top of this stack without removing it from the stack. |
E | pop() | Removes the object at the top of this stack and returns that object as the value of this function. |
E | push(E item) | Pushes an item onto the top of this stack. |
int | search(Object o) | Returns the 1-based position where an object is on this stack. |
add,add,addAll,addAll,addElement,capacity,clear,clone,contains,containsAll,copyInto,elementAt,elements,ensureCapacity,equals,firstElement,forEach,get,hashCode,indexOf,indexOf,insertElementAt,isEmpty,iterator,lastElement,lastIndexOf,lastIndexOf,listIterator,listIterator,remove,remove,removeAll,removeAllElements,removeElement,removeElementAt,removeIf,removeRange,replaceAll,retainAll,set,setElementAt,setSize,size,sort,spliterator,subList,toArray,toArray,toString,trimToSizeparallelStream,streampublic E push(E item)
addElement(item)
item - the item to be pushed onto this stack.item argument.Vector.addElement(E)public E pop()
EmptyStackException - if this stack is empty.public E peek()
EmptyStackException - if this stack is empty.public boolean empty()
true if and only if this stack contains no items;false otherwise.public int search(Object o)
o - the desired object.-1 indicates that the object is not on the stack.