Find customer with minimum balance

MinBalanceCustomer.java

// JAVA WAY - Who has minimum balance
Customer minBalanceCustomer = Collections.min(
  customers, (o1, o2) -> (int) (o1.getBalance() - o2.getBalance())
);

MinBalanceCustomer.kt

// KOTLIN WAY - Who has minimum balance
val minBalanceCustomer = customers.minBy { it.balance }