Livecode

src/ListNode.java

@@ -1,3 +1,13 @@
 public class ListNode {
+
+    //
+    public int data; 
+    public ListNode next;
+
+    //constructor
+    public ListNode(int data){
+        this.data = data;
+    }
+
 
 }

src/Practice.java

@@ -1,5 +1,56 @@
 public class Practice {
     public static void main(String[] args) {
+        //this is a new variable listNode named head with the value 14
+        ListNode head = new ListNode(14); //pass the value 14 to the constructor data
 
+        //this is a new variable listNode named mySeven with the value 7
+        ListNode mySeven = new ListNode(7);
+
+        //this means i go to the next value of the next node after the head. here the head is 14, the begening. 
+        head.next = mySeven;
+
+        //This create a new ListNode after the node 7.
+        mySeven.next = new ListNode(28);
+        //This also create a new ListNode
+        head.next.next.next = new ListNode(32);
+        head.next.next.next.next = new ListNode(23);
+
+
+
+                                    //Print output....
+            //to print the head node
+        // System.out.println(head.data);
+
+            //to print the next node after the head. but you can also do printl(mySeven.data)
+        // System.out.println(head.next.data); 
+
+            //this print the Node with the value 28, we put 2 .next because it's the second Node after the head 14. and if we create more we can go so on with .next
+        // System.out.println(head.next.next.data);
+
+        // System.out.println(head);
+
+        ListNode current = head; //this means current take the value of the head whatever what is the head.
+
+        int total = 0;
+
+
+        //this check that if there is nothing anymore stop. when we reach the last number.
+        //as long as current is not equal to null, do the statement. 
+        while(current != null){
+            //print current, wich is the head 14.
+            System.out.println(current.data);
+            //take the value of the next node with current.next and store it inside current, then repeat the loop until we see a null then stop.
+
+            total += current.data;
+
+            //this is important and not forget it.
+            current = current.next;
+
+        }
+        System.out.println("The total is: " + total);
+
+        // System.out.println(current.data); //print out 14, which is the head now.
+
     }
+
 }