// The MIT License (MIT)

//

// Copyright (c) 2016 Robert C. Seacord

//

// Permission is hereby granted, free of charge, to any person obtaining a copy

// of this software and associated documentation files (the "Software"), to deal

// in the Software without restriction, including without limitation the rights

// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

// copies of the Software, and to permit persons to whom the Software is

// furnished to do so, subject to the following conditions:

//

// The above copyright notice and this permission notice shall be included in all

// copies or substantial portions of the Software.

//

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE

// SOFTWARE.

package MET11J;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.ObjectInputStream;

import java.io.ObjectOutputStream;

import java.util.Hashtable;

class BadSerialHasher {

public static void main(String[] args) throws IOException, ClassNotFoundException {

Hashtable<MyKey, String> ht = new Hashtable<>();

MyKey key = new MyKey();

ht.put(key, "Value"); //$NON-NLS-1$

System.out.println("Entry: " + ht.get(key)); //$NON-NLS-1$

// Retrieve using the key, works

// Serialize the Hashtable object

try (FileOutputStream fos = new FileOutputStream("hashdata.ser"); //$NON-NLS-1$

ObjectOutputStream oos = new ObjectOutputStream(fos)) {

oos.writeObject(ht);

}

// Deserialize the Hashtable object

Hashtable<MyKey, String> ht_in;

try (ObjectInputStream ois = new ObjectInputStream(new FileInputStream("hashdata.ser"))) { //$NON-NLS-1$

Hashtable<MyKey, String> readObject = (Hashtable<MyKey, String>) ois.readObject();

ht_in = readObject;

}

if (ht_in.contains("Value")) //$NON-NLS-1$

// Check whether the object actually exists in the hash table

System.out.println("Value was found in deserialized object."); //$NON-NLS-1$

// can fail after serialization and deserialization. Consequently,

// it may be impossible to retrieve the value of the object after

// deserialization by using the original key.

if (ht_in.get(key) == null) // Gets printed

System.out.println("Object was not found when retrieved using the key."); //$NON-NLS-1$

}

}