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Java - The Stack Class
Stack is a subclass of Vector that implements a standard last-in, first-out stack.
Stack only defines the default constructor, which creates an empty stack. Stack includes all the methods defined by Vector, and adds several of its own.
Stack( )
Apart from the methods inherited from its parent class Vector, Stack defines the following methods −
Sr.No. | Method & Description |
---|---|
1 | boolean empty()
This method tests if this stack is empty. |
2 | E peek()
This method looks at the object at the top of this stack without removing it from the stack. |
3 | E pop()
This method removes the object at the top of this stack and returns that object as the value of this function. |
4 | E push(E item)
This method pushes an item onto the top of this stack. |
5 | int search(Object o)
This method returns the 1-based position where an object is on this stack. |
Example
The following program illustrates several of the methods supported by this collection −
import java.util.*; public class StackDemo { static void showpush(Stack st, int a) { st.push(new Integer(a)); System.out.println("push(" + a + ")"); System.out.println("stack: " + st); } static void showpop(Stack st) { System.out.print("pop -> "); Integer a = (Integer) st.pop(); System.out.println(a); System.out.println("stack: " + st); } public static void main(String args[]) { Stack st = new Stack(); System.out.println("stack: " + st); showpush(st, 42); showpush(st, 66); showpush(st, 99); showpop(st); showpop(st); showpop(st); try { showpop(st); } catch (EmptyStackException e) { System.out.println("empty stack"); } } }
This will produce the following result −
Output
stack: [ ] push(42) stack: [42] push(66) stack: [42, 66] push(99) stack: [42, 66, 99] pop -> 99 stack: [42, 66] pop -> 66 stack: [42] pop -> 42 stack: [ ] pop -> empty stack