How private writeObject method of Serializable object called by object of ObjectOutputStream

Question

When i run this demo it\'s call TestBean\'s writeObject method which is private

How is it possible ?

Here is the Code:

import j         


        

Answer 1

If your serializable object has any writeObject method, it will be called otherwise the defaultWriteObject method will be called.

The private method calling is possible using the reflection. If you see the source code of ObjectOutputStream Class in that method writeSerialData, the code below answers your question.

if (slotDesc.hasWriteObjectMethod()) {
 // through reflection it will call the Serializable objects writeObject method
} else {
// the below is the same method called by defaultWriteObject method also.
writeSerialData(obj, desc);
}