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/**
 * Definition for singly-linked list.
 * class ListNode {
 *     int val;
 *     ListNode next;
 *     ListNode(int x) {
 *         val = x;
 *         next = null;
 *     }
 * }
 */
public class Solution {
    public boolean hasCycle(ListNode head) {
 
 
        ListNode slow = head;
        ListNode fast = head;
 
        while (fast != null && fast.next != null) {
 
 
            slow = slow.next;
            fast = fast.next.next;
 
 
            if (slow == fast)
                return true;
        }
 
        return false;
    }
}

Main.java:12: error: class Solution is public, should be declared in a file named Solution.java
public class Solution {
       ^
Main.java:13: error: cannot find symbol
    public boolean hasCycle(ListNode head) {
                            ^
  symbol:   class ListNode
  location: class Solution
Main.java:16: error: cannot find symbol
        ListNode slow = head;
        ^
  symbol:   class ListNode
  location: class Solution
Main.java:17: error: cannot find symbol
        ListNode fast = head;
        ^
  symbol:   class ListNode
  location: class Solution
4 errors

Standard output is empty