import java.util.Arrays; public class ComparableTester { public static void main(String[] args) { BankAccount[] accounts = new BankAccount[3]; accounts[0] = new BankAccount(10000); accounts[1] = new BankAccount(0); accounts[2] = new BankAccount(2000); Arrays.sort(accounts); for (int i = 0; i < accounts.length; i++) { System.out.print(accounts[i].getBalance() + " "); } System.out.println(); System.out.println("Expected: 0.0 2000.0 10000.0"); } }