// 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 GoodSerialHasher {

public static void main(String[] args)

throws IOException, ClassNotFoundException {

// The type of the key value has been changed to an Integer object.

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

final Integer key = 1;

ht.put(key, "Value");

System.out.println("Entry: " + ht.get(key)); // Retrieve using the key

// Serialize the Hashtable object

try (

ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream("hashdata.ser"))

) {

oos.writeObject(ht);

}

// Deserialize the Hashtable object

Hashtable<Integer, String> ht_in;

try (

ObjectInputStream ois = new ObjectInputStream(new FileInputStream("hashdata.ser"))

) {

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

}

if (ht_in.contains("Value"))

// Check whether the object actually exists in the Hashtable

System.out.println("Value was found in deserialized object.");

if (ht_in.get(key) == null) // Not printed

System.out.println(

"Object was not found when retrieved using the key.");

}

}