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DoublyLinkedList.java
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DoublyLinkedList.java
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package day4;
import java.util.*;
public class DoublyLinkedList {
public static void main(String[] args) {
ArrayList<Integer> list=new ArrayList<>();
Scanner sc=new Scanner(System.in);
int choice,val;
do {
System.out.println("Eneter the choice");
System.out.println("\n1.Insert at beginning\n2.Insert at end\n3.Insert at particlular position\n4.Delete at beginning\n5.Delete at end\n6.Delete at particular\n7.EXIT");
choice=sc.nextInt();
switch(choice) {
case 1:
System.out.println("Enter the value");
val=sc.nextInt();
list.add(0,val);
System.out.println(list);
break;
case 2:System.out.println("Enter the value");
val=sc.nextInt();
list.add(val);
System.out.println(list);
break;
case 3:
System.out.println("Enter the position");
int pos = sc.nextInt();
System.out.println("Enter the value");
val=sc.nextInt();
list.add(pos-1,val);
System.out.println(list);
break;
case 4:
val=list.remove(0);
System.out.println("Removed element:"+val);
System.out.println(list);
break;
case 5:
val=list.remove((list.size())-1);
System.out.println("Removed element:"+val);
System.out.println(list);
break;
case 6:
System.out.println("Enter the position to be deleted:");
pos=sc.nextInt();
val=(int) list.remove(pos-1);
System.out.println("Removed element:"+val);
System.out.println(list);
break;
case 7:
System.out.println("Bye......Thank u");
break;
default: System.out.println("Enter a valid option");
break;
}
}while(choice!=7);
}
}