关于基本的LinkedList

Question

我正在做一个实验报告，分配是＆＃34;写一个名为countWord的方法。它接收String并返回输入String的次数 在LinkedList中找到。＆＃34;

这是我的代码，但是当我运行它时，没有输出。

public class LinkedList {
 private Node head; // the 'front' or 'head' node of the linked list
   private int count;

   public LinkedList() {
      head = null;
      count = 0;
   }

   // Method #1
   public void addToFront(String d) {
      Node n = new Node(d, head);
      head = n;
      count++;
   }

//代码的其余部分..

public int countWord (String d) {
  Node curr = head;
  int index = 0;
  while(curr != null) {
    if(curr.getData().equals(d))
      index++;

    curr = curr.getNext();
  }
}

return index;
}

演示类

public class Demo {
public static void main(String[]args){
    LinkedList songs=new LinkedList();
    songs.addToFront("blue");
    songs.addToFront("crooked");
    songs.addToFront("lie");
    songs.addToFront("blue");
    songs.addToFront("sober");
    songs.addToFront("asdf");
    songs.addToFront("blue");
    System.out.println(songs.countWord("blue"));
}

}