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| java.lang.Object
 java.util.Vector
java.util.Stack
| Stack | | public class Stack extends Vector (Code) | | 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.
version:
12/17/01 (CLDC 1.1)
since:
JDK1.0, CLDC 1.0 |
| Constructor Summary | |
| public | Stack()
Creates an empty Stack. |
| Method Summary | |
| public boolean | empty()
Tests if this stack is empty. | | public synchronized Object | peek()
Looks at the object at the top of this stack without removing it
from the stack. | | public synchronized Object | pop()
Removes the object at the top of this stack and returns that
object as the value of this function. | | public Object | push(Object item)
Pushes an item onto the top of this stack. | | public synchronized int | search(Object o)
Returns the 1-based position where an object is on this stack. |
| Stack | | public Stack()(Code) | | Creates an empty Stack.
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| empty | | public boolean empty()(Code) | | Tests if this stack is empty.
true if and only if this stack contains no items; false otherwise. |
| peek | | public synchronized Object peek()(Code) | | Looks at the object at the top of this stack without removing it
from the stack.
the object at the top of this stack (the last item of the Vector object).
exception:
EmptyStackException - if this stack is empty. |
| pop | | public synchronized Object pop()(Code) | | Removes the object at the top of this stack and returns that
object as the value of this function.
The object at the top of this stack (the last item of the Vector object).
exception:
EmptyStackException - if this stack is empty. |
| push | | public Object push(Object item)(Code) | | Pushes an item onto the top of this stack. This has exactly
the same effect as:
addElement(item)
Parameters:
item - the item to be pushed onto this stack. the item argument.
See Also: java.util.Vector.addElement |
| search | | public synchronized int search(Object o)(Code) | | 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. the 1-based position from the top of the stack where the object is located; the return value -1indicates that the object is not on the stack. |
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