Javaでの関連付け

class Customer{
int cid;
String cname;
Order ordering;
}

package demo;
import java.io.*;
class Department
{
private String dname;
public void setDepartmentName(String cname)
{
this.dname = cname;
}
public String getDepartmentName()
{
return this.dname;
}
}
class Emp
{
public String ename;
public void setEmployeeName(String ename)
{
this.ename = ename;
}
public String getEmployeeName()
{
return this.ename;
}
}
class demo
{
public static void main (String[] args)
{
Department d = new Department();
Department d1 = new Department();
Emp e = new Emp();
Emp e1 = new Emp();
d.setDepartmentName("Sales");
d1.setDepartmentName("Accounting");
e.setEmployeeName("John");
e1.setEmployeeName("Joseph");
System.out.println(e.getEmployeeName() + " is working in " + d.getDepartmentName() + ".");
System.out.println(e1.getEmployeeName() + " is working in " + d1.getDepartmentName() + ".");
}
}

import java.io.*;
import java.util.*;
class Customer
{
String cname;
int cid ;
String type;
public static int cpp=0,ccod=0;
Customer(String cname, int cid, String type)
{
this.cname = cname;
this.cid = cid;
this.type = type;
if(type=="prepaid")
cpp++;
else
ccod++;
}
}
class Order
{
String type;
//list of customer Objects associated with customer class as with its Object(s). */
private List<Customer> customers;
public void setCustomers(String type, List<Customer> customers)
{
this.type = type;
this.customers = customers;
}
public List<Customer> getCustomers()
{
return customers;
}
}
class OnlineStore
{
// list of order Objects which associated with order as with its objects.
private List<Order> orders;
public void setnoCustomer( List<Order> orders)
{
this.orders = orders;
}
// count total customers of all orders in a given purchases
public int getnoCustomer()
{
int noOfOrders = 0;
List<Customer> customers;
for(Order dept : orders)
{
customers = dept.getCustomers();
for(Customer s : customers)
{
noOfOrders++;
}
}
return noOfOrders;
}
}
class demo
{
public static void main (String[] args)
{
Customer c1 = new Customer("Mia", 1, "prepaid");
Customer c2 = new Customer("Priya", 2, "prepaid");
Customer c3 = new Customer("John", 1, "COD");
Customer c4 = new Customer("Rahul", 2, "COD");
List <Customer> cu1 = new ArrayList<Customer>();
cu1.add(c1);
cu1.add(c2);
// making a List of COD Customers
List <Customer> cu2 = new ArrayList<Customer>();
cu2.add(c3);
cu2.add(c4);
Order pp = new Order();
pp.setCustomers("prepaid", cu1);
Order cod = new Order();
cod.setCustomers("COD", cu2);
List <Order> orders = new ArrayList<Order>();
orders.add(pp);
orders.add(cod);
// creating an OnlineStore instance.
OnlineStore purchase = new OnlineStore();
purchase.setnoCustomer(orders);
System.out.print("Number of Customers placed order are : ");
System.out.println(purchase.getnoCustomer());
System.out.print("Number of Customers placed prepaid order are : ");
System.out.println(Customer.cpp);
System.out.print("Number of Customers placed cod order are : ");
System.out.println(Customer.cpp);
}
}

class Car
{
private String color;
private int wheels;
public void carFeatures()
{
System.out.println("The color of the car is "+color + " and number of wheels are " + wheels);
}
public void setColor(String color)
{
this.color = color;
}
public void setwheels(int wheels)
{
this.wheels = wheels;
}
}
class Maruti extends Car
{
public void setStart()
{
MarutiEngine e = new MarutiEngine();
e.run();
}
}
class MarutiEngine extends Maruti
{
public void run()
{
System.out.println("Engine is running...");
}
public void stop()
{
System.out.println("Engine is not running... ");
}
}
public class demo
{
public static void main(String[] args)
{
Maruti m1 = new Maruti();
m1.setwheels(4);
m1.setColor("White");
m1.carFeatures();
m1.setStart();
}
}