在特定位置插入节点时出现逻辑错误

请考虑以下我的代码，以便在假定链表已排序的情况下在特定位置插入节点：

package datastructures;
public class Link {
    int data;
    Link next;

    public Link(int d){
        this.data = d;
    }

    public void displayLink(){
        System.out.println(data + " ");
    }
   
    public static class LinkList {
        Link first;

        public void insertFirst(int x) {
            Link newLink = new Link(x);
            newLink.next = first;
            first = newLink;
        }

        public Link deleteFirst() {
            Link temp = first;
            first = first.next;
            return temp;
        }

        public void displayList() {
            Link current = first;
            while (current != null) {
               current.displayLink();
               current = current.next;
            }
        }
                            
        public void insertNodeAtParticularLocation(int x){
            Link previous = first;
            Link current = first.next;

            if (first == null){
                // if node doesn't exist in the 
                // linkedlist then just create a new node
                Link newNode = new Link(x);
            } else if (x < first.data) {
                // Else if the value that needs to be inserted
                // is less than the first element, then insert 
                // it at the very beginning
                      
                Link newNode = new Link(x);
                newNode.next = first;
                first = newNode;
            } else {
                while(current.data > x){ // In case of21,22,23,27 ; If x = 24 , current should stop at 27
                    previous = current;
                    current = current.next;
                    Link newNode = new Link(x);
                    previous.next = newNode;
                    newNode.next = current;
                }
            }
        }
    }

    
    public static void main(String[] args) {
        
        LinkList addElements = new LinkList();
        
        addElements.insertFirst(21);
        addElements.insertFirst(22);
        addElements.insertFirst(23);
        addElements.insertFirst(27);
        addElements.insertFirst(29);
        
        System.out.println("Display Original Elements");
        
        addElements.displayList();
        
        addElements.insertNodeAtParticularLocation(24);
        
        System.out.println("Display Elements after First Modification");
        
        addElements.displayList();
    }
}

我的insertNodeAtParticularLocation()方法有些问题。

问题1：

当我尝试添加时24，它仍会添加到列表的末尾，而不是在应该位于具有value的节点之后的指定位置23。

问题2：

另外，我尝试添加另一个10我希望在开始时添加的值，但是它覆盖了最后一个元素27，并在该位置被添加。请让我知道我在做什么错。