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Java IO ObjectStreamField

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  • Last Updated : 26 Oct, 2021
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The Java. io. ObjectStreamField class is a description of a Serializable field from a Serializable interface. This class is serialization’s descriptor for classes. An array of The ObjectStreamFields is utilized to maintain the Serializable fields of a class. It includes the name and serialVersionUID of the class.

The Class Declaration for Java IO ObjectStreamField is as –

1. public class ObjectStreamField extends Object       // extends Keyword is used  

2. public class ObjectStreamField implements Comparable<Object>   // implements Keyword is used

Constructors of Java IO ObjectStreamField 

Following Are The Two Constructors For The Class  Java IO ObjectStreamField –



Constructor Description
1 ObjectStreamField (String name, Class<?> type) This Constructor Creates a Serializable field with the specified type to it                                                                
2 ObjectStreamField (String name, Class<?> type, boolean unshared)                                                                                                       This Constructor Creates an ObjectStreamField representing a serializable field with the given name and type of it

Methods of Java IO ObjectStreamField 

S.No.      Method  Method  Type                                                     Description      
1 compareTo(Object obj)                                      int  This Method is Comparing this field with another ObjectStreamField
2 getName()  String  This method gives the name of the field
3 GetOffset()  int  This method returns the offset of the field within instance data
4 getType()  Class<?> It gives the type of the field for the get type method
5 getTypeCode()  char  This method returns the character encoding of the field type
6 getTypeString()  String  This method returns the JVM type Signature
7 isPrimitive()  boolean  It returns true if the field has a primitive type
8 isUnshared()  boolean  It returns a boolean value indicating whether or not the serializable field represented by this ObjectStreamField instance is unshared.
9 setOffset( int offset)                            protected void  This method returns offset within the instance of the data
10 toString()   String  It returns a string that describes all this field



// Java program to illustrate the working
// of the Java IO ObjectStreamField class
import java.util.Calendar;  
public class ObjectStreamClassExample
     public static void main(String[] args)
          // creating a new object for the stream class for the Integers  
          ObjectStreamClass abc = ObjectStreamClass.lookup(String.class);  
          // getting the value field from ObjectStreamClass for the integers  
          System.out.println("" + abc.getField("value"));  
          // creating new object stream class for the  Calendar  
          ObjectStreamClass abc2 = ObjectStreamClass.lookup(Calendar.class);  
          // get the Class instance for abc2  
          System.out.println("" + abc2.getField("isTimeSet"));  

Output –

I value
Z isTimeSet

Example for Method of Java IO ObjectStreamField ( compareTo(Object obj) ) –   

The subsequent illustration explains the usefulness of the method –


// Java program to illustrate the working of the
// Java IO ObjectStreamField(compareTo(Object obj)) class
public class ObjectStreamField_ShowDemo {
   public static void main(String[] args) {
      // creating a new object stream class for The Integers
      ObjectStreamClass xyz = ObjectStreamClass.lookupAny(Integer.class);
      // getting the field value from Integer class
      ObjectStreamField field = xyz.getField("value");
      // creating a new object stream class for floats
      ObjectStreamClass xyz2 = ObjectStreamClass.lookupAny(Float.class);
      // getting the field value from Integer class
      ObjectStreamField field2 = xyz.getField("value");
      // comparing with another field
      System.out.println("" + field.compareTo(field2));

Output :


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