$ javac src/PaymentDemo.java && java PaymentDemo     (21.0.10+7-Ubuntu-124.04)
Card[last4=4242, amount=500] -> fee 10 | card payment ending 4242
Card[last4=1111, amount=25000] -> fee 500 | large card payment ending 1111
Upi[vpa=ankur@bank, amount=500] -> fee 0 | UPI payment from ankur@bank
NetBanking[bank=HDFC, amount=500] -> fee 15 | net banking via HDFC

$ javac src/PaymentDemo.java && java PaymentDemo     (25.0.4.1+1-LTS)
Card[last4=4242, amount=500] -> fee 10 | card payment ending 4242
Card[last4=1111, amount=25000] -> fee 500 | large card payment ending 1111
Upi[vpa=ankur@bank, amount=500] -> fee 0 | UPI payment from ankur@bank
NetBanking[bank=HDFC, amount=500] -> fee 15 | net banking via HDFC

$ javac src/PaymentDemo.java && java PaymentDemo     (27+35)
Card[last4=4242, amount=500] -> fee 10 | card payment ending 4242
Card[last4=1111, amount=25000] -> fee 500 | large card payment ending 1111
Upi[vpa=ankur@bank, amount=500] -> fee 0 | UPI payment from ankur@bank
NetBanking[bank=HDFC, amount=500] -> fee 15 | net banking via HDFC