class Node{
    int data;
    Node next;
    Node(int a){
        data = a;
    }
}
class LinkedListWorking {
    Node kepala;
    int c;
    void create(int b){
        kepala = new Node(b);
    }
    void add(int b){
        Node current = kepala;
        if (kepala == null)
            create(b);
        else{
            while(current.next != null){
        
                current = current.next;
            }
            current.next = new Node(b); 
        }
    }
    void find(int b){
        Node current = kepala;
        int n = 0;
        if (current == null)
            System.out.println(“Data kosong”);
        else{
            while(current.next != null){
                if (current.data == b){
                    System.out.println(“Indeks: “+n);
                    return;
                }
                n++;
                current = current.next;
            }
            
                System.out.println(“Tidak ditemukan”);
        }    
    }  
    void addIndex(int index, int b){
        Node current = kepala;
        Node after = current.next;
        for (int n = 1;n<(index-1);n++){
            current = current.next;
            after = after.next;
        }
        Node newnode = new Node(b);
        
        current.next = newnode;
        current.next.next = after;
    }
   public void display(){
        Node current = kepala;
        if (current == null)
            System.out.println(“Data kosong”);
        else{
            while(current.next != null){
                System.out.print(current.data+” “);
                current = current.next;
            }System.out.println(current.data+” “);
        }
    }
 public static void main(String[] args) {
       LinkedListWorking a = new LinkedListWorking();      
        a.add(2);
        a.add(3);
        a.add(7);
        a.add(5);
        a.add(1);
        a.add(6);
        a.add(9);
	  a.display();
	System.out.println(“mencari nilai 3 terletak pada”);
        a.find(3);
	System.out.println(“menyisipkan nilai 9 pada indeks ke-2”);
        a.addIndex(3,9);
	  a.display();
    }
}