I am getting number formate exception in this code problem is given two linkedList sum of linked list one and two can be obtai

Question

class Solution{
//Function to add two numbers represented by linked list.
static Node addTwoLists(Node first, Node second){

String f = "";
Node t1 = first;
while(t1 != null){
f = f+t1.data;
t1 = t1.next;
}

String s = "";
Node t2 = second;
while(t2 != null){
s = s+t2.data;
t2 = t2.next;
}

int num = Integer.parseInt(f)+ Integer.parseInt(s);

String str = String.valueOf(num);

Node dum = new Node(100);
str.trim();
Node ans = add(dum,str);

return removeLastNode(ans);
}

static Node add(Node head,String str){

// Node temp = head;

for(int i = str.length()-1;i>=0;i--){

char ch = str.ch

Answer 1

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