Java program to calculate total cost of an item using methods (OOP)

import java.util.*;
class invoice
{
public static void main (String args[])
{
Scanner in = new Scanner (System.in);
String name;
itemdata ob = new itemdata();
ob.get();
System.out.print ("\n\t Enter item name = ");
name=in.nextLine();
ob.cost();
ob.displyLine(name);

}
}


class itemdata
{
Scanner in = new Scanner (System.in);
int number;
double quantity,price,tcost=0;
void get()
{
System.out.print ("\n\t Enter item number = ");
number=in.nextInt();
}

void cost()
{
System.out.print ("\n\t Enter item quantity = ");
quantity=in.nextDouble();
System.out.print ("\n\t Enter item price per unit = ");
price=in.nextDouble();
tcost=quantity*price;
}

void displyLine(String name)
{
System.out.println ("\n\t Item number = "+number);
System.out.println ("\n\t Item nume = "+name);
System.out.println ("\n\t Item quantity = "+quantity);
System.out.println ("\n\t Item price per unit = "+price);
System.out.println ("\n\t Total cost = "+tcost);
}

}

Java program to calculate salary of an employe using methods

import java.util.*;
class salary
{
public static void main (String args[])
{
Scanner in = new Scanner (System.in);
double hpr,rh,oh;
System.out.print ("\n\t Enter hourly pay rate = ");
hpr=in.nextDouble();
System.out.print ("\n\t Enter regular hours = ");
rh=in.nextDouble();
System.out.print ("\n\t Enter overtime hours = ");
oh=in.nextDouble();

double rhp=0,otp,tp=0;
rhp = hpr*rh;                            //calculating regular hours pay: rhp

calculate ob = new calculate();            //creating object of class calculate
otp=ob.overtimepay(hpr,oh);                   //calling the method overtimepay
tp=rhp+otp;                                //calculating total pay

System.out.println ("\n\t Regular hours pay = "+rhp);
System.out.println ("\n\t Overtime pay = "+otp);
System.out.println ("\n\t Total pay = "+tp);
}
}


class calculate
{
double otp;
double overtimepay (double hpr, double oh)        //recieving hourly pay rate and overtime hours hpr, oh respectively
{
otp=(hpr*0.5)*oh;                                //calculating overtime pay
return otp;
}
}