linked list - How can i make this java node searchandadd method work by passing object? -

here code:

public void searchandadd(object tofind,object toadd) {     node prev=null;     node curr=head;     node newnode=new node(toadd);     curr=new node;     while(curr!=null&&newvalue>curr.item)     {         prev=curr;         curr=curr.next;     } } 

how can make method work in java? , in advance :)