Implicit call of toString()

/*
Therron Telford
AP CS A
October 14, 2017
*/

public class BankAccount {

    private double balance;
    private double deposit;

    public void deposit(){

        double deposit = 100;

    }
    public String toString(){
        return "The balance  is " + (balance + deposit);
    }
}

// in the main of BankAccountTest
// BankAccount mine = new BankAccount();
// mine.deposit();
// System.out.println(mine);