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Java ObjectStreamField getTypeString() Method with Example

ObjectStreamField Class getTypeString() method: Here, we are going to learn about the getTypeString() method of ObjectStreamField Class with its syntax and example.
Submitted by Preeti Jain, on April 13, 2020

ObjectStreamField Class getTypeString() method

  • getTypeString() method is available in java.io package.
  • getTypeString() method is used to return the Java Virtual Machine (JVM) type signature of this ObjectStreamField.
  • getTypeString() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.
  • getTypeString() method does not throw an exception at the time of returning type code.


    public String getTypeString();


  • It does not accept any parameter.

Return value:

The return type of the method is String, it returns null when this class field holds type "primitive".


// Java program to demonstrate the example 
// of String getTypeString() method 
// of ObjectStreamField

import java.io.*;
import java.util.*;

public class GetTypeStringOfOSF {
 public static void main(String[] args) {
  // Instantiates ObjectStreamClass for Calendar
  ObjectStreamClass o_sc = ObjectStreamClass.lookup(Calendar.class);

  // By using getField() method is to get the field
  // value from Calendar 
  ObjectStreamField field1 = o_sc.getField("isTimeSet");
  ObjectStreamField field2 = o_sc.getField("fields");

  // By using getTypeString() method is to return
  // the type string of the field

  String field1_typestr = field1.getTypeString();
  System.out.println("field1.getTypeString(): " + field1_typestr);

  String field2_typestr = field2.getTypeString();
  System.out.println("field2.getTypeString(): " + field1_typestr);


field1.getTypeString(): null
field2.getTypeString(): null

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