Question

can you solve it in java please

Create the following:

1. Class Invoice ( the node ) that includes three instance variables:

    int No; // the Invoice No

            String CustName; // the Customer name

            int Amount; // the Invoice Amount

Invoice next; // points to the next Invoice

Default and overloaded constructors

2. Class Shop that includes three instance variables:

Invoice head;

Invoice Tail;

Your class should have the following:

• A method that initializes the instance variables.

• void add (int, String, int) creates and adds the Invoice information ( No, CustName and Amount) in the singly linked list.

• void delete (int) to delete an Invoice in the single linked list.

• void printInvoices() prints all the Invoices in the single linked list.

• int countInvoices () counts the number of Invoices in the list.

• int Sum () counts the summation of the Invoices.

click in the file bellow to view the source code for add-head and delete methods

addHead-delete-methods.docx

Write a test application. In the main method, do the following:

• Create a Shop object.

• ask the user to enter the number of Invoices in the Shop.

• Input the No, CustName and Amount of each Invoice and add it to the Shop class (Hint: Use a loop).

• Print the Invoices.

• Input the No. of the Invoice to be deleted. Delete the Invoice

• Print the Invoices.

• Print the number of Invoice.

• Print the summation of all Invoices

Answer 1

import java.util.*; //Invoice class class Invoice{    int no;//account no    String custname;//custmer no    int ammount;//ammount    Invoice next;//pointing to next Invoice    //Constructer    public Invoice(int no,String custname,int ammount){        this.no=no;        this.custname=custname;        this.ammount=ammount;        next=null;    }    //toString method which gives Invoice    public String toString(){        return (no+" "+custname+" "+ammount);    } } //shop class class Shop{       Invoice head;    Invoice tail;    Scanner sc;    //Default constructer    public Shop(){        head=null;        tail=null;        sc=new Scanner(System.in);    }    //add method to add Invoice    public void add(int no,String custname,int ammount){        if(head==null){   //head==null            head=new Invoice(no,custname,ammount);            tail=head; //Intiall head and tail points to same node        }        else{              tail.next=new Invoice(no,custname,ammount);//adding Invoice at the end            tail=tail.next;//moving tail        }    }    //printint Invoices    public void printInvoices(){        Invoice temp=head;        while(temp!=null){            System.out.println(temp);            temp=temp.next;        }    }    //counting invoices    public int countInvoices(){        Invoice temp=head;        int count=0;        while(temp!=null){            count++;            temp=temp.next;        }        return count;    }    //counting invoices    public int sum(){        Invoice temp=head;        int count=0;        while(temp!=null){            count=count+temp.ammount;            temp=temp.next;        }        return count;    }    //deleteing a specifice account    public void delete(int no){        //if head exits        if(head!=null){            Invoice temp=head;            //if first invoice account is equal to required account            if(no==head.no){                temp=null;                head=head.next;            }            else{                Invoice prevTemp=null;                boolean found=false;                //to find invoic account                while(temp!=null){                    if(no==temp.no){                        found=true;    //account found                        break;                    }                    prevTemp=temp;                    temp=temp.next;                }                if(found){                    //chaning links                                   Invoice freeTemp=temp;                    prevTemp.next=temp.next;                    freeTemp=null;                }            }        }    }    public void menu(){        System.out.println("Enter\n 1->add Invoice \n 2->print Invoices \n 3->delete Invoice \n 4->print number of invoice \n 5->print summation of invoice\n0->exit");    }    //createInvoice    public void createInvioce(){               System.out.printf("Enter accountno::");        int no=sc.nextInt();        System.out.printf("Enter Customername::");        String custname=sc.next();        System.out.printf("Enter ammount::");        int ammount=sc.nextInt();        this.add(no,custname,ammount);       }    //main method    public static void main(String args[]){        Shop s=new Shop();        Scanner sc=new Scanner(System.in);        int option,no;        while(true){            s.menu();            System.out.println("Enter option");            option=sc.nextInt();            if(option==1){                s.createInvioce();            }            else if(option==2){                s.printInvoices();            }            else if(option==3){                System.out.printf("Enter account no to delete::");                no=sc.nextInt();                s.delete(no);            }            else if(option==4){                System.out.println("Total no of invoices::"+s.countInvoices());            }            else if(option==5){                System.out.println("Total Summation of invoices::"+s.sum());            }            else if(option==6){                break;            }        }    } }

nter 1-add Invoice 2->print Invoices 3-delete Invoice 4-print number of invoice xprint summation of invoice ->exit nter option nter accountno::1 nter Customername Sinu nter ammount::4000G nter 1-add Invoice 2->print Invoices 3-delete Invoice 4-print number of invoice xprint summation of invoice ->exit nter option nter accountno ::2 nter Customername amu nter ammount:29000 nter 1-add Invoice 2->print Invoices 3-delete Invoice 4-print number of invoice xprint summation of invoice ->exit nter option nter accountno::3 nter Customername seshu nter ammount::4000G nter 1-add Invoice 2->print Invoices 3-delete Invoice 4-print number of invoice xprint summation of invoice ->exit nter option srinu 40000 ramu 29000 seshu 40000 nter 1-add Invoice 2->print Invoices 3-delete Invoice 4-print number of invoice xprint summation of invoice ->exit

Enter option otal no of invoices::3 Enter 1-add Invoice 2->print Invoices 3-delete Invoice 4-print number of invoice xprint summation of invoice Q->exit Enter option Total Summation of inuvoices: :109000 Enter 1-add Invoice 2->print Invoices 3-delete Invoice 4-print number of invoice xprint summation of invoice Q->exit Enter option Enter account no to delete: :2 Enter 1-add Invoice 2->print Invoices 3-delete Invoice 4-print number of invoice xprint summation of invoice Q->exit Enter option 1 srinu 40000 3 seshu 4000G Enter 1-add Invoice 2->print Invoices 3-delete Invoice 4-print number of invoice xprint summation of invoice 0ー〉exit Enter option Enter account no to delete: :1 Enter 1-add Invoice 2->print Invoices 3-delete Invoice 4-print number of invoice xprint summation of invoice 0ー〉exit Enter option 3 seshu 4000G