JavaAlgorithms/DataStructures/Lists/SearchSinglyLinkedListRecursion.java

package DataStructures.Lists;

public class SearchSinglyLinkedListRecursion extends SinglyLinkedList {
  public static void main(String[] args) {
    SearchSinglyLinkedListRecursion list = new SearchSinglyLinkedListRecursion();
    for (int i = 1; i <= 10; ++i) {
      list.insert(i);
    }

    for (int i = 1; i <= 10; ++i) {
      assert list.search(i);
    }
    assert !list.search(-1) && !list.search(100);
  }

  /**
   * Test if the value key is present in the list using recursion.
   *
   * @param node the head node.
   * @param key the value to be searched.
   * @return {@code true} if key is present in the list, otherwise {@code false}.
   */
  private boolean searchRecursion(Node node, int key) {
    return node != null && (node.value == key || searchRecursion(node.next, key));
  }

  @Override
  public boolean search(int key) {
    return searchRecursion(getHead(), key);
  }
}