import java.util.*; class s1 { static int item_1,item_2,item_3; static String i1,i2,i3; static String fail="Sorry,Your requested order was unsuccessful due to less quantity of the given item!"; Customer_1 customer_1=new Customer_1(); Customer_2 customer_2=new Customer_2(); Customer_3 customer_3=new Customer_3(); static void set_items() { item_1=10; i1="Chocolate Cake"; item_2=8; i2="Dark Forest Ice Cream"; item_3=12; i3="Vanilla Cake"; } static void pack_items(String item,int quantity) { if(item.equals(i1)) { item_1-=quantity; } else if(item.equals(i2)) { item_2-=quantity; } else { item_3-=quantity; } } void send_items(String item,int quantity,int cust_index) { String success="Your order for "+quantity+" "+item+" is successful!"; if(cust_index==1) { customer_1.req1.remove(item); customer_1.q1.remove(quantity); System.out.println(success); } else if(cust_index==2) { customer_2.req2.remove(item); customer_2.q2.remove(quantity); System.out.println(success); } else { customer_3.req3.remove(item); customer_3.q3.remove(quantity); System.out.println(success); } } static boolean check_availability(String item,int quantity) { if(item.equals(i1)) { if(item_1>=quantity) { return true; } else { return false; } } else if(item.equals(i2)) { if(item_2>=quantity) { return true; } else { return false; } } else { if(item_3>=quantity) { return true; } else { return false; } } } } class Customer_1 extends Thread { ArrayList req1=new ArrayList(); ArrayList q1=new ArrayList(); String id1="Customer 1"; s1 s=new s1(); public void run() { req1.add(s1.i1); req1.add(s1.i3); q1.add(6); q1.add(7); if(s1.check_availability((req1.get(0)),(q1.get(0)))) { s1.pack_items(req1.get(0),q1.get(0)); s.send_items(req1.get(0),q1.get(0),1); } else { System.out.println(s1.fail); } if(s1.check_availability(req1.get(1),q1.get(1))) { s1.pack_items(req1.get(1),q1.get(1)); s.send_items(req1.get(1),q1.get(1),1); } else { System.out.println(s1.fail); } if((req1.size()==0)&&(q1.size()==0)) { System.out.println(id1+"-Your whole order was successful!"); } else { System.out.println(id1+"-Your whole order was not successful!"); } } } class Customer_2 extends Thread { ArrayList req2=new ArrayList(); ArrayList q2=new ArrayList(); String id2="Customer 2"; s1 s=new s1(); public void run() { req2.add(s1.i2); req2.add(s1.i3); q2.add(4); q2.add(3); if(s1.check_availability(req2.get(0),q2.get(0))) { s1.pack_items(req2.get(0),q2.get(0)); s.send_items(req2.get(0),q2.get(0),2); } else { System.out.println(s1.fail); } if(s1.check_availability(req2.get(1),q2.get(1))) { s1.pack_items(req2.get(1),q2.get(1)); s.send_items(req2.get(1),q2.get(1),2); } System.out.println(s1.fail); } } class Customer_3 extends Thread { ArrayList req3=new ArrayList(); ArrayList q3=new ArrayList(); String id3="Customer 3"; s1 s=new s1(); public void run() { req3.add(s1.i1); req3.add(s1.i3); q3.add(8); q3.add(4); if(s1.check_availability(req3.get(0),q3.get(0))) { s1.pack_items(req3.get(0),q3.get(0)); s.send_items(req3.get(0),q3.get(0),3); } else { System.out.println(s1.fail); } if(s1.check_availability(req3.get(1),q3.get(1))) { s1.pack_items(req3.get(1),q3.get(1)); s.send_items(req3.get(1),q3.get(1),3); } System.out.println(s1.fail); } } public class Program { public static void main(String[] args) { s1.set_items(); Customer_1 cu1=new Customer_1(); Customer_2 cu2=new Customer_2(); Customer_3 cu3=new Customer_3(); cu1.start(); cu2.start(); cu3.start(); } }

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