how to create a linked list in java

1public class LinkedList {
2
3    private Node head;
4    private int length = 0;
5
6    public LinkedList() {
7        this.head = new Node(null);
8    }
9
10    public int size() {
11        return length;
12    }
13
14
15     // Adds an element to the end of the list
16    public void add(Object data)  {
17
18        Node node = new Node(data);
19        Node iterator = head;
20        while (iterator.getNext() != null){
21            iterator = iterator.getNext();
22        }
23        iterator.setNext(node);
24        length++;
25    }
26
27
28     // Obtains an element by index
29    public Object get(int index) {
30
31        if (head.getNext() == null || index >= length){
32            return null;
33        }
34
35        Node iterator = head.getNext();
36        int counter = 0;
37
38        while(counter < index){
39
40            iterator = iterator.getNext();
41            counter++;
42        }
43        return iterator.getData();
44
45    }
46
47
48     // Returns the index of the element in the list
49    public int indexOf(Object data) {
50        Node obj=head;
51        for (int i = 0; i < length; i++) {
52            obj = obj.getNext();
53            if (obj.getData().equals(data)) {
54                return i;
55            }
56        }
57        return -1;
58        //throw new Exception("Data not found");
59    }
60
61
62     // Removes an element from the list
63    public boolean remove(Object data) {
64
65        if (head.getNext() == null){
66            return false;
67        }
68
69        Node iterator = head;
70
71        while(iterator.getNext() != null){
72
73            if (iterator.getNext().getData().equals(data)){
74                iterator.setNext(iterator.getNext().getNext());
75                length--;
76                return true;
77            }
78
79            iterator = iterator.getNext();
80        }
81
82        return false;
83    }
84
85    private class Node {
86
87        private Object data;
88        private Node next;
89
90        public Node(Object data) {
91            this.data = data;
92            next = null;
93        }
94
95        public Object getData() {
96            return data;
97        }
98
99        public void setData(Object data) {
100            this.data = data;
101        }
102
103        public Node getNext() {
104            return next;
105        }
106
107        public void setNext(Node next) {
108            this.next = next;
109        }
110    }
111
112}

1List<Integer> list = new LinkedList<>();

1 LinkedList<String> list=new LinkedList<String>();

1// Java program to iterate the elements  
2// in an LinkedList 
3    
4import java.util.*;  
5    
6public class GFG {  
7    
8    public static void main(String args[])  
9    {  
10        LinkedList<String> ll  
11            = new LinkedList<>();  
12    
13        ll.add("Geeks");  
14        ll.add("Geeks");  
15        ll.add(1, "For");  
16    
17        // Using the Get method and the  
18        // for loop  
19        for (int i = 0; i < ll.size(); i++) {  
20    
21            System.out.print(ll.get(i) + " ");  
22        }  
23    
24        System.out.println();  
25    
26        // Using the for each loop  
27        for (String str : ll)  
28            System.out.print(str + " ");  
29    }  
30}