Data structure in java language. plz help i do not have time!!

Write a java method called "containsCycle" that receives the head of a singly linked list and returns true if the linked list contains a cycle and returns false otherwise. A linked list contains cycles if the next reference of any node refers to a preceding node. For example the linked list contains a cycle: 01-02 +03 ->04 - 05 TI 08 07 06