The class can also be said to extend Vector and treats the class as a stack with the five mentioned functions. The class can. Java code for stack implementation. In the above program, we have seen almost all the methods of Stack class in Java, but we will see each method in detail in the next portion of.
The
Stack
class represents a last-in-first-out (LIFO) stack of objects. It extends class Vector with five operations that allow a vector to be treated as a stack. The usual push and pop operations are provided, as well as a method to peek at the top item on the stack, a method to test for whether the stack is empty, and a method to search 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 the
Deque
interface and its implementations, which should be used in preference to this class. For example: - Since:
- JDK1.0
- See Also:
- Serialized Form
Field Summary |
---|
Fields inherited from class java.util.Vector |
---|
capacityIncrement, elementCount, elementData |
Fields inherited from class java.util.AbstractList |
---|
modCount |
Constructor Summary |
---|
Stack() Creates an empty Stack. |
Method Summary | |
---|---|
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. |
Methods inherited from class java.util.Vector |
---|
add, add, addAll, addAll, addElement, capacity, clear, clone, contains, containsAll, copyInto, elementAt, elements, ensureCapacity, equals, firstElement, get, hashCode, indexOf, indexOf, insertElementAt, isEmpty, lastElement, lastIndexOf, lastIndexOf, remove, remove, removeAll, removeAllElements, removeElement, removeElementAt, removeRange, retainAll, set, setElementAt, setSize, size, subList, toArray, toArray, toString, trimToSize |
Methods inherited from class java.util.AbstractList |
---|
iterator, listIterator, listIterator |
Methods inherited from class java.lang.Object |
---|
finalize, getClass, notify, notifyAll, wait, wait, wait |
Methods inherited from interface java.util.List |
---|
iterator, listIterator, listIterator |
Constructor Detail |
---|
Stack
- Creates an empty Stack.
Method Detail |
---|
push
- Pushes an item onto the top of this stack. This has exactly the same effect as:
- Parameters:
item
- the item to be pushed onto this stack.- Returns:
- the
item
argument. - See Also:
Vector.addElement(E)
pop
- Removes the object at the top of this stack and returns that object as the value of this function.
- Returns:
- The object at the top of this stack (the last item of the Vector object).
- Throws:
EmptyStackException
- if this stack is empty.
peek
- Looks at the object at the top of this stack without removing it from the stack.
- Returns:
- the object at the top of this stack (the last item of the Vector object).
- Throws:
EmptyStackException
- if this stack is empty.
empty
- Tests if this stack is empty.
- Returns:
true
if and only if this stack contains no items;false
otherwise.
search
- Returns the 1-based position where an object is on this stack. If the object o occurs as an item in this stack, this method returns the distance from the top of the stack of the occurrence nearest the top of the stack; the topmost item on the stack is considered to be at distance 1. The equals method is used to compare o to the items in this stack.
- Parameters:
o
- the desired object.- Returns:
- the 1-based position from the top of the stack where the object is located; the return value
-1
indicates that the object is not on the stack.
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Standard Ed. 6
For further API reference and developer documentation, see Java SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.
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