what's wrong with this code. cant get the last condition.

Question about the task

AmigoSet (part 5)

Java Collections, Level 4, Lesson 15

Under discussion

Your AmigoSet set implements the Serializable interface. However, it doesn't serialize properly.

1. Implement your own logic for serializing and deserializing.
Remember which private methods you need to add in order to serialize correctly.

To serialize:
* serialize the set
* serialize the map object's capacity and loadFactor. You'll need them for deserialization.
Since this data is package-private, use the HashMapReflectionHelper utility class to get it.

To deserialize:
* read all of the data
* create a map using the constructor with capacity and loadFactor parameters

2. Remember what transient means?

Requirements:

The AmigoSet class must have a private writeObject method with one ObjectOutputStream parameter.
The AmigoSet class must have a private readObject method with one ObjectInputStream parameter.
The writeObject method must call the defaultWriteObject method on the ObjectOutputStream object passed as an argument.
The readObject method must call the defaultReadObject method on the ObjectInputStream object passed as an argument.
The object serialized using the writeObject method must equal the object deserialized using the readObject method.

package com.codegym.task.task37.task3707; import java.lang.reflect.InvocationTargetException; import java.lang.reflect.Method; import java.util.HashMap; public class HashMapReflectionHelper { public static <T> T callHiddenMethod(HashMap map, String methodName) { try { Method method = map.getClass().getDeclaredMethod(methodName); method.setAccessible(true); return (T) method.invoke(map); } catch (NoSuchMethodException | InvocationTargetException | IllegalAccessException ignored) { } return null; } }

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Guadalupe Gagnon

Level 37 , Tampa, United States

3 June 2020, 15:54

Some problems: The writeObject() writes in the order of: default, this (which is unnecessary), size, capacity, load, then each key The readObject() reads in the order of: default, capacity, load, size, then each key In the read method, you are using map.put() when the code already has an add() method defined that adds keys properly.