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because the question asks to "return the head of the updated linked list". In your case you're returning the pointer (is that correct Java terminology?) to the last node.
I did the same mistake, initially and was scratching my head to figured where I went wrong. Hence people say understanding the requirement is important. You may right functionally correct code, but if that is not meeting the requirement, then the whole purpose of your program/app is defeated.
public static Node insert(Node head,int data) {
//Complete this method
if (head == null){
head = new Node(data);
head.data = data;
}
else {
Node node = head;
while (node.next != null){
node = node.next;
}
node.next = new Node(data);
node.next.data = data;
}
return head;
}
Make sure to pass by value the int data when creating a new instance of Node. The constructor in class Node (line 7 of code) demands that you specify an int when creating a new Node object. Remember a class constructor is the blueprint for stating what parameters (requirements) an object needs before it can be created. Coded for us already is the method signature of our insert function, which tells us that we already have an int data availabe for us to use. It's being passed by value into the funtion. So make sure that this is the value used when creating new Node objects.
Thank you to Elnaz for your contribution. I was stuck on this one for a while and could not have solved this without you.
Insert a Node at the Tail of a Linked List
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Why must you declare a "Node node = head"? Initially I had:
But this method doesn't work. May you explain why? Thank you!
because the question asks to "return the head of the updated linked list". In your case you're returning the pointer (is that correct Java terminology?) to the last node.
I did the same mistake, initially and was scratching my head to figured where I went wrong. Hence people say understanding the requirement is important. You may right functionally correct code, but if that is not meeting the requirement, then the whole purpose of your program/app is defeated.
CORRECTION to above code For Java 8
public static Node insert(Node head,int data) { //Complete this method if (head == null){ head = new Node(data); head.data = data; } else { Node node = head; while (node.next != null){ node = node.next; } node.next = new Node(data); node.next.data = data; } return head;
}
Make sure to pass by value the int data when creating a new instance of Node. The constructor in class Node (line 7 of code) demands that you specify an int when creating a new Node object. Remember a class constructor is the blueprint for stating what parameters (requirements) an object needs before it can be created. Coded for us already is the method signature of our insert function, which tells us that we already have an int data availabe for us to use. It's being passed by value into the funtion. So make sure that this is the value used when creating new Node objects.
Thank you to Elnaz for your contribution. I was stuck on this one for a while and could not have solved this without you.
That was really helpful..Thank u so much