In this program, we are going to share Java program to implement singly linked list with the output. If you are a Java beginner and want to start learning the Java programming, then keep your close attention in this tutorial as I am going to share how to write a Java program to implement singly linked list.
Copy the below Java program and execute it with the help of Javac compiler. At the end of this program, We have shared the output of this program.
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import java.util.Scanner; class Node { protected int data; protected Node link; public Node() { link = null; data = 0; } public Node(int d,Node n) { data = d; link = n; } public void setLink(Node n) { link = n; } public void setData(int d) { data = d; } public Node getLink() { return link; } public int getData() { return data; } } class linkedList { protected Node start; protected Node end ; public int size ; public linkedList() { start = null; end = null; size = 0; } public boolean isEmpty() { return start == null; } public int getSize() { return size; } public void insertAtStart(int val) { Node nptr = new Node(val, null); size++ ; if(start == null) { start = nptr; end = start; } else { nptr.setLink(start); start = nptr; } } public void insertAtEnd(int val) { Node nptr = new Node(val,null); size++ ; if(start == null) { start = nptr; end = start; } else { end.setLink(nptr); end = nptr; } } public void insertAtPos(int val , int pos) { Node nptr = new Node(val, null); Node ptr = start; pos = pos - 1 ; for (int i = 1; i < size; i++) { if (i == pos) { Node tmp = ptr.getLink() ; ptr.setLink(nptr); nptr.setLink(tmp); break; } ptr = ptr.getLink(); } size++ ; } public void deleteAtPos(int pos) { if (pos == 1) { start = start.getLink(); size--; return ; } if (pos == size) { Node s = start; Node t = start; while (s != end) { t = s; s = s.getLink(); } end = t; end.setLink(null); size --; return; } Node ptr = start; pos = pos - 1 ; for (int i = 1; i < size - 1; i++) { if (i == pos) { Node tmp = ptr.getLink(); tmp = tmp.getLink(); ptr.setLink(tmp); break; } ptr = ptr.getLink(); } size-- ; } public void display() { System.out.print("\nSingly Linked List = "); if (size == 0) { System.out.print("empty\n"); return; } if (start.getLink() == null) { System.out.println(start.getData() ); return; } Node ptr = start; System.out.print(start.getData()+ "->"); ptr = start.getLink(); while (ptr.getLink() != null) { System.out.print(ptr.getData()+ "->"); ptr = ptr.getLink(); } System.out.print(ptr.getData()+ "\n"); } } public class SinglyLinkedList { public static void main(String[] args) { Scanner scan = new Scanner(System.in); linkedList list = new linkedList(); System.out.println("Singly Linked List Test\n"); char ch; do { System.out.println("\nSingly Linked List Operations\n"); System.out.println("1. insert at begining"); System.out.println("2. insert at end"); System.out.println("3. insert at position"); System.out.println("4. delete at position"); System.out.println("5. check empty"); System.out.println("6. get size"); int choice = scan.nextInt(); switch (choice) { case 1 : System.out.println("Enter integer element to insert"); list.insertAtStart( scan.nextInt() ); break; case 2 : System.out.println("Enter integer element to insert"); list.insertAtEnd( scan.nextInt() ); break; case 3 : System.out.println("Enter integer element to insert"); int num = scan.nextInt() ; System.out.println("Enter position"); int pos = scan.nextInt() ; if (pos <= 1 || pos > list.getSize() ) System.out.println("Invalid position\n"); else list.insertAtPos(num, pos); break; case 4 : System.out.println("Enter position"); int p = scan.nextInt() ; if (p < 1 || p > list.getSize() ) System.out.println("Invalid position\n"); else list.deleteAtPos(p); break; case 5 : System.out.println("Empty status = "+ list.isEmpty()); break; case 6 : System.out.println("Size = "+ list.getSize() +" \n"); break; default : System.out.println("Wrong Entry \n "); break; } list.display(); System.out.println("\nDo you want to continue (Type y or n) \n"); ch = scan.next().charAt(0); } while (ch == 'Y'|| ch == 'y'); } } |
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