题解 | #判断链表中是否有环#

package sf;

public class hlb {
public static void main(String[] args) {
hhlb node1=new hhlb(1);
hhlb node2=new hhlb(2);
hhlb node3=new hhlb(3);
node1.next=node2;
node2.next=node3;
node3.next=node1;
boolean b0=hhb(node1);
System.out.println(b0);

}
static boolean hhb(hhlb head){
    hhlb l1=head;
    hhlb l2=head;
    if(head==null){
        return false;
    }

    while (l2!=null&&l2.next!=null){
        l1=l1.next;
        l2=l2.next.next;
        if (l1==l2){
            return true;
        }
    }
    return false;
}

}
class hhlb{
int val;
hhlb next;

public hhlb(int val) {
    this.val = val;
}

}