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bael-5728 added code (#14010) 

* bael-5728 added code

* bael-5728 added code

* bael-5728 added code

* bael-5728 code fix

* bael-5728 code fix

---------

Co-authored-by: Sachin kumar <sachin.n.kumar@oracle.com>
This commit is contained in:
sachin 2023-05-31 06:54:52 +05:30 committed by GitHub
parent b0799740ad
commit 3d15ed0020
4 changed files with 179 additions and 0 deletions
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21
core-java-modules/core-java-serialization/src/main/java/com/baeldung/readresolvevsreadobject/Singleton.java Normal file
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package com.baeldung.readresolvevsreadobject;
import java.io.ObjectStreamException;
import java.io.Serializable;
public class Singleton implements Serializable {
private static final long serialVersionUID = 1L;
private static Singleton INSTANCE = new Singleton();
private Singleton() {
}
public static Singleton getInstance() {
return INSTANCE;
}
private Object readResolve() throws ObjectStreamException {
return INSTANCE;
}
}

59
core-java-modules/core-java-serialization/src/main/java/com/baeldung/readresolvevsreadobject/User.java Normal file
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package com.baeldung.readresolvevsreadobject;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
public class User implements Serializable {
private static final long serialVersionUID = 3659932210257138726L;
private String userName;
private String password;
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
@Override
public String toString() {
return "User [userName=" + userName + ", password=" + password + "]";
}
public User() {
}
public User(String userName, String password) {
super();
this.userName = userName;
this.password = password;
}
private void writeObject(ObjectOutputStream oos) throws IOException {
this.password = "xyz" + password;
oos.defaultWriteObject();
}
private void readObject(ObjectInputStream aInputStream)
throws ClassNotFoundException, IOException {
aInputStream.defaultReadObject();
this.password = password.substring(3);
}
private Object readResolve() {
return this;
}
}

47
core-java-modules/core-java-serialization/src/test/java/com/baeldung/readresolvevsreadobject/SingletonUnitTest.java Normal file
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package com.baeldung.readresolvevsreadobject;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import org.junit.Test;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotEquals;
public class SingletonUnitTest {
@Test
public void testSingletonObj_withNoReadResolve() throws ClassNotFoundException, IOException {
// Serialization
FileOutputStream fos = new FileOutputStream("singleton.ser");
ObjectOutputStream oos = new ObjectOutputStream(fos);
Singleton actualSingletonObject = Singleton.getInstance();
oos.writeObject(actualSingletonObject);
// Deserialization
Singleton deserializedSingletonObject = null;
FileInputStream fis = new FileInputStream("singleton.ser");
ObjectInputStream ois = new ObjectInputStream(fis);
deserializedSingletonObject = (Singleton) ois.readObject();
// remove readResolve() from Singleton class and uncomment this to test.
//assertNotEquals(actualSingletonObject.hashCode(), deserializedSingletonObject.hashCode());
}
@Test
public void testSingletonObj_withCustomReadResolve()
throws ClassNotFoundException, IOException {
// Serialization
FileOutputStream fos = new FileOutputStream("singleton.ser");
ObjectOutputStream oos = new ObjectOutputStream(fos);
Singleton actualSingletonObject = Singleton.getInstance();
oos.writeObject(actualSingletonObject);
// Deserialization
Singleton deserializedSingletonObject = null;
FileInputStream fis = new FileInputStream("singleton.ser");
ObjectInputStream ois = new ObjectInputStream(fis);
deserializedSingletonObject = (Singleton) ois.readObject();
assertEquals(actualSingletonObject.hashCode(), deserializedSingletonObject.hashCode());
}
}

52
core-java-modules/core-java-serialization/src/test/java/com/baeldung/readresolvevsreadobject/UserUnitTest.java Normal file
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package com.baeldung.readresolvevsreadobject;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import org.junit.Test;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotEquals;
public class UserUnitTest {
@Test
public void testDeserializeObj_withOverriddenReadObject()
throws ClassNotFoundException, IOException {
// Serialization
FileOutputStream fos = new FileOutputStream("user.ser");
ObjectOutputStream oos = new ObjectOutputStream(fos);
User acutalObject = new User("Sachin", "Kumar");
oos.writeObject(acutalObject);
// Deserialization
User deserializedUser = null;
FileInputStream fis = new FileInputStream("user.ser");
ObjectInputStream ois = new ObjectInputStream(fis);
deserializedUser = (User) ois.readObject();
assertNotEquals(deserializedUser.hashCode(), acutalObject.hashCode());
assertEquals(deserializedUser.getUserName(), "Sachin");
assertEquals(deserializedUser.getPassword(), "Kumar");
}
@Test
public void testDeserializeObj_withDefaultReadObject()
throws ClassNotFoundException, IOException {
// Serialization
FileOutputStream fos = new FileOutputStream("user.ser");
ObjectOutputStream oos = new ObjectOutputStream(fos);
User acutalObject = new User("Sachin", "Kumar");
oos.writeObject(acutalObject);
// Deserialization
User deserializedUser = null;
FileInputStream fis = new FileInputStream("user.ser");
ObjectInputStream ois = new ObjectInputStream(fis);
deserializedUser = (User) ois.readObject();
assertNotEquals(deserializedUser.hashCode(), acutalObject.hashCode());
assertEquals(deserializedUser.getUserName(), "Sachin");
// remove readObject() from User class and uncomment this to test.
//assertEquals(deserializedUser.getPassword(), "xyzKumar");
}
}