java - order dependency (topological sort) with input of string -

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https://leetcode.com/problems/course-schedule-ii/ question similar 1 instead, has input of string instead of numbers. following classes , sample test case , signatures. wondering how deal input of string 

import java.util.*; class order{     string order = "";     public order(string string){         this.order = string;     } } class orderdependency{     order cur;     order pre;     public orderdependency(order o1, order o2){         cur = o1;         pre = o2;     } } public class order_dependency {     public static list<order> getorderlist(list<orderdependency> orderdependencies){      ***code starts here***      }     public static void main(string[] args) {         order o1 = new order("a");         order o2 = new order("b");         order o3 = new order("c");         order o4 = new order("d");         orderdependency od1 = new orderdependency(o1, o2);         orderdependency od2 = new orderdependency(o2, o3);         orderdependency od3 = new orderdependency(o3, o4);         list<orderdependency> list = new arraylist<>();         list.add(od1);         list.add(od2);         list.add(od3);          (order o : getorderlist(list)){             system.out.println(o.order);         }     } }


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