CIS 260 TestLinkedList.java

Code

/*
    TestLinkedList.java
    David Klick
    CIS 260
    2009-03-23

    This program demonstrates a few features of the LinkedList class.
*/

import java.util.*;

public class TestLinkedList {
    public static void main(String[] args) {
        LinkedList<Integer> llist = new LinkedList<Integer>();
        int n;

        // you can add and remove items dynamically
        System.out.println("Adding: 17, 26, -8, 142");
        llist.add(17);
        llist.add(26);
        llist.add(-8);
        llist.add(142);
        for (int i : llist) System.out.print(i + " ");
        System.out.println("\nRemoving item at index 1");
        llist.remove(1);  // removes item at index 1
        for (int i : llist) System.out.print(i + " ");
        System.out.println("\nFirst: " + llist.getFirst());
        System.out.println("Last: " + llist.getLast());
        System.out.println("Peeking at first: " + llist.peekFirst());
        System.out.println("Peeking at last: " + llist.peekLast());

        System.out.println("Popping first item: " + (n = llist.pop()));
        for (int i : llist) System.out.print(i + " ");
        System.out.println("\nPushing first item: " + n);
        llist.push(n);
        for (int i : llist) System.out.print(i + " ");

        System.out.println("\nRemoving first: " + llist.removeFirst());
        System.out.println("Removing last: " + llist.removeLast());
        for (int i : llist) System.out.print(i + " ");
        System.out.println("\nAdding first: " + -75);
        llist.addFirst(-75);
        System.out.println("Adding last: " + 32);
        llist.addLast(32);
        for (int i : llist) System.out.print(i + " ");

        // you can also out a LinkedList
        System.out.println("\nClearing linked list");
        llist.clear();
        System.out.println("isEmpty(): " + llist.isEmpty());
    }
}

/*
    Output:

    Adding: 17, 26, -8, 142
    17 26 -8 142
    Removing item at index 1
    17 -8 142
    First: 17
    Last: 142
    Peeking at first: 17
    Peeking at last: 142
    Popping first item: 17
    -8 142
    Pushing first item: 17
    17 -8 142
    Removing first: 17
    Removing last: 142
    -8
    Adding first: -75
    Adding last: 32
    -75 -8 32
    Clearing linked list
    isEmpty(): true
*/