Java Code

//UnsortedOptimizedArray_Dawadi.java import java.util.Scanner;// to use scanner public class UnsortedOptimizedArray_Dawadi { public static void main(String[] args) { int choice;//variable for choice of user FA2019_ArrayBasedStructureDemo_Dawadi z = new FA2019_ArrayBasedStructureDemo_Dawadi(); Scanner sc1=new Scanner(System.in); do { System.out.println("1. Insert one account"); System.out.println("2. Verify encapsulation"); System.out.println("3. Update an account"); System.out.println("4. Delete an account"); System.out.println("5. Show all accounts"); System.out.println("0. Exit"); choice=sc1.nextInt(); switch(choice)//selects each case based on user input { case 1: z.insert(); break; case 2: z.encap(); break; case 3: z.update(); break; case 4: z.remove_acc(); break; case 5: z.show(); break; case 0: break; default://if user selects anything outside 1-5, shows this message System.out.println("Invalid choice"); } } while(choice!=0);//exits program while selection is not 0 } }