Write the code necessary to convert the following sequence of listnode objects: list -> [1] -> [2] / into this sequence of listnode objects: list -> [1] -> [2] -> [3] / assume that you are using listnode class as defined in the textbook: public class listnode { public int data; // data stored in this node public listnode next; // a link to the next node in the list public listnode() { } public listnode(int data) { } public listnode(int data, listnode next) { } }

Following are the question in the Java Programming Language:

public class ListNode // define the class which is already mentioned in the question  

{

public int data; //set integer type variable

public ListNode next; //create a next node of the ListNode type

//define constructor for the node with 0 and null

public ListNode()

{

this(0,null); //point to the node with 0 and null

}

//define parameterized constructor with 0 and null

public ListNode(int data)

{

//point to the node with 0 and null

this(data, null);

}

//define parameterized constructor with given data and link

public ListNode(int data, ListNode next) {

//this pointer to point  tthe current data

this.data=data;

//this pointer to point next node

this.next=next;

}

//conversion of the string  

public String toString()

{

//set string type variable

String str = "list->" + this.data;

//at next node

ListNode listNode = this.next;

//set do-while loop

do

{

//print symbol with data

str += "->" +"["+listNode.data+"]";

//point to the next node

listNode = listNode.next;

} while (listNode != null); // iterating the do while loop

//return the string variable str

return str;

}

public static void main(String[] args)// main function

{

//call and pass value to the constructor

ListNode list3 = new ListNode(3);

//call and pass value to the constructor

ListNode list2 = new ListNode(2, list3);

//call and pass value to the constructor

ListNode list1 = new ListNode(1, list2);

//print list variable.

System.out.println(list1);

}

}

Output:

list->1->2->3

Explanation:

Following are the description of the program.

In the following Java Program, we define a class "ListNode" and inside the class.

Finally, we define the main function that passes the value and calls the following constructor.

answer ingress;