diff --git a/src/ListNode.java b/src/ListNode.java index dd6028c..8293484 100644 --- a/src/ListNode.java +++ b/src/ListNode.java @@ -1,3 +1,4 @@ public class ListNode { - + public char data; + public ListNode next; } \ No newline at end of file diff --git a/src/Practice.java b/src/Practice.java index 34a2f8d..14d7585 100644 --- a/src/Practice.java +++ b/src/Practice.java @@ -1,5 +1,95 @@ +import java.util.List; + public class Practice { public static void main(String[] args) { + ListNode myNode = new ListNode(); + myNode.data = 'x'; + + ListNode anotherNode = new ListNode(); + anotherNode.data = 't'; + + myNode.next = anotherNode; + + ListNode moreNode = new ListNode(); + moreNode.data = 'r'; + + anotherNode.next = moreNode; + + ListNode coolNode = new ListNode(); + coolNode.data = 'w'; + coolNode.next = myNode; + + ListNode extra = moreNode; + moreNode.data = 'e'; + + ListNode hello = new ListNode(); + hello.data = 'x'; + extra.next = hello; + //printList(coolNode); + + ListNode newHead = removeAt(coolNode, 2); + printList(newHead); + //int xCount = countX(coolNode); + //System.out.println(xCount); + + //System.out.println(extra.data); + //System.out.println(myNode.next.next.data); + //System.out.println(myNode.data); + //System.out.println(anotherNode.data); + } + + public static void printList(ListNode head) { + // starting from head + // print all data in list in order + + + // keep track of current, starting at head + ListNode current = head; + + // until end of list + while(current != null) { + // print out data at current + System.out.println(current.data); + // move current to the next node + current = current.next; + + } + } + + // count how many nodes hold an x + public static int countX(ListNode head) { + int count = 0; + + ListNode current = head; + while(current != null) { + if(current.data == 'x') { + count++; + } + current = current.next; + } + + return count; + } + + // remove the node at removeIndex, and return the head of the list + // Ex + // e -> t -> k -> y + // removeIndex 2 + // e -> t -> y + + public static ListNode removeAt(ListNode head, int removeIndex) { + if(removeIndex == 0) { + return head.next; + } + + ListNode current = head; + + for(int i = 0; i < removeIndex - 1; i++) { + current = current.next; + } + //removes + current.next = current.next.next; + return head; } }