| 11 | |
| 12 | public class Stacks { |
| 13 | public static void main(String[] args) { |
| 14 | Stack<String> stack = new Stack<>(); |
| 15 | for(Month m : Month.values()) |
| 16 | stack.push(m.toString()); |
| 17 | System.out.println("stack = " + stack); |
| 18 | // Treating a stack as a Vector: |
| 19 | stack.addElement("The last line"); |
| 20 | System.out.println( |
| 21 | "element 5 = " + stack.elementAt(5)); |
| 22 | System.out.println("popping elements:"); |
| 23 | while(!stack.empty()) |
| 24 | System.out.print(stack.pop() + " "); |
| 25 | |
| 26 | // Using a LinkedList as a Stack: |
| 27 | LinkedList<String> lstack = new LinkedList<>(); |
| 28 | for(Month m : Month.values()) |
| 29 | lstack.addFirst(m.toString()); |
| 30 | System.out.println("lstack = " + lstack); |
| 31 | while(!lstack.isEmpty()) |
| 32 | System.out.print(lstack.removeFirst() + " "); |
| 33 | |
| 34 | // Using the Stack class from |
| 35 | // the Collections Chapter: |
| 36 | onjava.Stack<String> stack2 = |
| 37 | new onjava.Stack<>(); |
| 38 | for(Month m : Month.values()) |
| 39 | stack2.push(m.toString()); |
| 40 | System.out.println("stack2 = " + stack2); |
| 41 | while(!stack2.isEmpty()) |
| 42 | System.out.print(stack2.pop() + " "); |
| 43 | |
| 44 | } |
| 45 | } |
| 46 | /* Output: |
| 47 | stack = [JANUARY, FEBRUARY, MARCH, APRIL, MAY, JUNE, |