59 lines
2.0 KiB
Java
59 lines
2.0 KiB
Java
// collectionsindepth/Stacks.java
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// (c)2016 MindView LLC: see Copyright.txt
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// We make no guarantees that this code is fit for any purpose.
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// Visit http://mindviewinc.com/Books/OnJava/ for more book information.
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// Demonstration of Stack Class.
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import java.util.*;
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enum Month { JANUARY, FEBRUARY, MARCH, APRIL, MAY, JUNE,
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JULY, AUGUST, SEPTEMBER, OCTOBER, NOVEMBER }
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public class Stacks {
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public static void main(String[] args) {
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Stack<String> stack = new Stack<>();
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for(Month m : Month.values())
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stack.push(m.toString());
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System.out.println("stack = " + stack);
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// Treating a stack as a Vector:
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stack.addElement("The last line");
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System.out.println("element 5 = " + stack.elementAt(5));
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System.out.println("popping elements:");
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while(!stack.empty())
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System.out.print(stack.pop() + " ");
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// Using a LinkedList as a Stack:
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LinkedList<String> lstack = new LinkedList<>();
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for(Month m : Month.values())
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lstack.addFirst(m.toString());
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System.out.println("lstack = " + lstack);
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while(!lstack.isEmpty())
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System.out.print(lstack.removeFirst() + " ");
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// Using the Stack class from
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// the Collections Chapter:
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onjava.Stack<String> stack2 =
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new onjava.Stack<>();
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for(Month m : Month.values())
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stack2.push(m.toString());
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System.out.println("stack2 = " + stack2);
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while(!stack2.empty())
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System.out.print(stack2.pop() + " ");
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}
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}
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/* Output:
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stack = [JANUARY, FEBRUARY, MARCH, APRIL, MAY, JUNE, JULY,
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AUGUST, SEPTEMBER, OCTOBER, NOVEMBER]
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element 5 = JUNE
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popping elements:
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The last line NOVEMBER OCTOBER SEPTEMBER AUGUST JULY JUNE
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MAY APRIL MARCH FEBRUARY JANUARY lstack = [NOVEMBER,
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OCTOBER, SEPTEMBER, AUGUST, JULY, JUNE, MAY, APRIL, MARCH,
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FEBRUARY, JANUARY]
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NOVEMBER OCTOBER SEPTEMBER AUGUST JULY JUNE MAY APRIL MARCH
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FEBRUARY JANUARY stack2 = [NOVEMBER, OCTOBER, SEPTEMBER,
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AUGUST, JULY, JUNE, MAY, APRIL, MARCH, FEBRUARY, JANUARY]
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NOVEMBER OCTOBER SEPTEMBER AUGUST JULY JUNE MAY APRIL MARCH
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FEBRUARY JANUARY
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*/
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