架构师训练营 - 第八周作业

public class Test4 {
    public static void main(String[] args) {
        LinkedList<String> linkedList1 = new LinkedList<>();
        LinkedList<String> linkedList2 = new LinkedList<>();
        linkedList1.add("a");
        linkedList1.add("b");
        linkedList1.add("x");
        linkedList1.add("y");
        linkedList1.add("z");
        linkedList2.add("d");
        linkedList2.add("e");
        linkedList2.add("f");
        linkedList2.add("x");
        linkedList2.add("y");
        linkedList2.add("z");
        System.out.println(display(linkedList1,linkedList2));
    }
    public static String display(LinkedList<String> linkedList1,LinkedList<String> linkedList2){
        String str=null;
        LinkedList<String> longList=null;
        LinkedList<String> shortList=null;
        if(linkedList1.size()>linkedList2.size()){
            longList=linkedList1;
            shortList=linkedList2;
        }else{
            longList=linkedList2;
            shortList=linkedList1;
        }
        int longListIndex=longList.size()-shortList.size();
        for(int shortListIndex=0;shortListIndex<shortList.size();shortListIndex++,longListIndex++){
            //System.out.println(shortList.get(shortListIndex)+""+longList.get(longListIndex));
            if(shortList.get(shortListIndex).equals(longList.get(longListIndex))){
                if(str==null)) {
                    str = shortList.get(shortListIndex);
                }
            }else {
                str=null;
            }
        }
        return str;
    }
}