java.rmi.MarshalledObject Class in Java
Last Updated :
26 Nov, 2021
java.rmi.MarshalledObject is a java class, a MarshalledObject contains a byte stream with the serialized representation of an object given to its constructor, The contained object is serialized and deserialized with the same serialization semantics used for marshaling and unmarshaling parameters.
Signature
public final class MarshalledObject<T> extends Object implements Serializable
Constructor
MarshalledObject(T object) – MarshalledObject(T object) initializes a new instance of MarshalledObject class that contains the serialized representation of the current state of the supplied object.
MarshalledObject m = new MarshalledObject(T object);
Note: m is the new instance of MarshalledObject class.
Methods
MarshalledObject class contains three method named as –
- hashCode()
- get()
- equals(Object object)
Let us discuss all three methods of this class individually to get a better understanding. Here we go:
1. MarshalledObject.hashCode() method
It is a part of java.rmi.MarshalledObject class, hashCode() method will return hash code associated with this MarshalledObject.
Syntax:
public int hashCode().
Method Return Type: hashCode() method has int return type and will return a hash code for this MarshalledObject
How to invoke hashCode() method
Step 1: First create an instance of MarshalledObject and pass on the object to be serialized.
MarshalledObject marshalledObject = new MarshalledObject(object);
Step 2: Now invoke the hashCode() method to get the hash code of this marshalledObject
int code = marshalledObject.hashCode();
Example: Java program to get the hash code using MarshalledObject.hashCode() method
Java
import java.io.*;
import java.rmi.*;
class tmp implements Serializable {
public int x;
}
class GFG {
public static void main(String[] args)
{
getHashCode(new tmp());
}
@SuppressWarnings("unchecked")
public static void getHashCode(tmp t)
{
try {
MarshalledObject marshalledObject = new MarshalledObject(t);
System.out.println("Hash code for this marshalled object is " + marshalledObject.hashCode());
}
catch (Exception e) {
System.out.println(e.getMessage());
}
}
}
|
Output:
Hash code for this marshalled object is -571669764
2. MarshalledObject.get() method
It is a part of java.rmi.MarshalledObject class, get() method will return a new copy of the contained marshalledObject.
Method Signature
public T get() throws IOException,
ClassNotFoundException.
Method Return Type: get() method will return the copy of contained MarshalledObject.
Parameter: get() method has no parameter
Exception: get() method might throw IOException,ClassNotFoundException.
How to invoke get() method?
Step 1: First create an instance of MarshalledObject and pass on the object to be serialized.
MarshalledObject marshalledObject = new MarshalledObject(object);
Step 2: Now invoke the get() method to get the new copy of this marshalledObject.
Object obj = marshalledObject.get();
Example: Java program to get the copy of MarshalledObject using MarshalledObject.get() method
Java
import java.io.*;
import java.rmi.*;
class tmp implements Serializable {
public int x;
}
class GFG {
public static void main(String[] args)
{
get(new tmp());
}
@SuppressWarnings("unchecked")
public static void get(tmp t)
{
try {
MarshalledObject marshalledObject = new MarshalledObject(t);
System.out.println("Copy marshalled object is " + marshalledObject.get());
System.out.println("Original marshalled object is " + t);
}
catch (Exception e) {
System.out.println(e.getMessage());
}
}
}
|
Output:
Copy marshalled object is tmp@66cd51c3
Original marshalled object is tmp@63c12fb0
3. MarshalledObject.equals() Method
It is a part of java.rmi.MarshalledObject class, equals() method will compare this MarshalledObject to another object, if both the serialized object is the same then this method will return true otherwise false.
Method Signature
public boolean equals(Object obj).
Method Return Type: equals() method has boolean return type, It will return true if the argument refers to a MarshalledObject that contains exactly the same serialized representation of an object as this one does.
Method Parameter: equals() method has one parameter of Object Type.
How to invoke equals() method?
Step 1: first create an instance of both MarshalledObject and pass on the object to be serialized.
MarshalledObject marshalledObjectOne = new MarshalledObject(object);
MarshalledObject marshalledObjectTwo = new MarshalledObject(object);
Step 2: Now invoke the equals() method to compare marshalledObject with the argument passed to the equals() method.
boolean isSame = marshalledObjectOne.equals(marshalledObjectTwo);
Example: Java program to compare this MarshalledObject using MarshalledObject.equals() method
Java
import java.io.*;
import java.rmi.*;
class tmp implements Serializable {
public int x;
}
class GFG {
public static void main(String[] args)
{
compare(new tmp(),new tmp());
}
@SuppressWarnings("unchecked")
public static void compare(tmp a,tmp b)
{
try {
MarshalledObject marshalledObjectOne = new MarshalledObject(a);
MarshalledObject marshalledObjectTwo = new MarshalledObject(b);
System.out.println("marshalledObjectOne and marshalledObjectTwo are same : "
+ marshalledObjectOne.equals(marshalledObjectTwo));
}
catch (Exception e) {
System.out.println(e.getMessage());
}
}
}
|
Output:
marshalledObjectOne and marshalledObjectTwo are same : true
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