49 lines
1.8 KiB
Java
49 lines
1.8 KiB
Java
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//: containers/Stacks.java
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// Demonstration of Stack Class.
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import java.util.*;
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import static net.mindview.util.Print.*;
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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<String>();
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for(Month m : Month.values())
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stack.push(m.toString());
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print("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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print("element 5 = " + stack.elementAt(5));
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print("popping elements:");
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while(!stack.empty())
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printnb(stack.pop() + " ");
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// Using a LinkedList as a Stack:
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LinkedList<String> lstack = new LinkedList<String>();
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for(Month m : Month.values())
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lstack.addFirst(m.toString());
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print("lstack = " + lstack);
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while(!lstack.isEmpty())
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printnb(lstack.removeFirst() + " ");
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// Using the Stack class from
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// the Holding Your Objects Chapter:
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net.mindview.util.Stack<String> stack2 =
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new net.mindview.util.Stack<String>();
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for(Month m : Month.values())
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stack2.push(m.toString());
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print("stack2 = " + stack2);
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while(!stack2.empty())
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printnb(stack2.pop() + " ");
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}
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} /* Output:
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stack = [JANUARY, FEBRUARY, MARCH, APRIL, MAY, JUNE, JULY, 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 MAY APRIL MARCH FEBRUARY JANUARY lstack = [NOVEMBER, OCTOBER, SEPTEMBER, AUGUST, JULY, JUNE, MAY, APRIL, MARCH, FEBRUARY, JANUARY]
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NOVEMBER OCTOBER SEPTEMBER AUGUST JULY JUNE MAY APRIL MARCH FEBRUARY JANUARY stack2 = [NOVEMBER, OCTOBER, SEPTEMBER, AUGUST, JULY, JUNE, MAY, APRIL, MARCH, FEBRUARY, JANUARY]
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NOVEMBER OCTOBER SEPTEMBER AUGUST JULY JUNE MAY APRIL MARCH FEBRUARY JANUARY
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*///:~
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