Break up a string literal over multiple lines

Break up the string on the new line using + operator works.

public String toString() {
    return String.format("BankAccount[owner: %s, balance: "
            + "%2$.2f, interest rate:"
            + " %3$.2f]", 
            myCustomerName, 
            myAccountBalance, myIntrestRate);
}

Sample Output: BankAccount[owner: TestUser, balance: 100.57, interest rate: 12.50]