java对象按引用

Question

I forgot some java concept.

PaymentData payment = basket.getPaymentData(); 
PaymentData newPayment =  payment;
basket.unMaskCreditCardNumbers(payment);
basket.maskCreditCardNumbers(payment);

Here issue is when unmask the payment object, newPayment object also unmasking. if I mask payment object newPayment object again masking.

Is this happened by "object by reference"?

Thank You

Answer 1

Yes. Both payment and newPayment are references/pointing to the same object.

Answer 2

在Java中，一切都是通过值传递的，这意味着在您的情况下，引用将从payment复制到newPayment 。

Answer 3

不，它是按值引用的对象。