commonNodes.java

class GfG
{   
    public HashSet<Integer> set = new HashSet<Integer>();
	public void printCommon(Node root1,Node root2){
	    inOrder(root1);
	    print(root2);
	    //System.out.println();
    }
    public void inOrder(Node root){
        if(root == null)
         return; 
         inOrder(root.left);
         set.add(root.data);
         inOrder(root.right);
    }
    public void print(Node root){
        if(root == null){
            return;
        }
        print(root.left);
        if(set.contains(root.data)){
            System.out.print(root.data + " ");
        }
        print(root.right);
    }
}