872. Leaf-Similar Trees

class Solution {
    public boolean leafSimilar(TreeNode root1, TreeNode root2) {
      List arrRoot1 = new ArrayList<Integer>();
      List arrRoot2 = new ArrayList<Integer>();

       isLeaf(root1,arrRoot1);
       isLeaf(root2,arrRoot2);
     return arrRoot1.equals(arrRoot2);
    }
    void isLeaf(TreeNode root, List<Integer>arrRoot){
       if(root == null) return ;
       if(root.left == null && root.right == null)
           arrRoot.add(root.val);
       else{
           isLeaf(root.left,arrRoot);
           isLeaf(root.right,arrRoot);
       }
    
    }
}