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Java Program to Convert Object to String

Last Updated : 23 Jul, 2025
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The first byte needs to be converted into an object byte which can easily be dealt with to convert to strings. Convert Object to String in java using toString() method of Object class or String.valueOf(object) method. Since there are mainly two types of class in java, i.e. user-defined class and predefined class such as StringBuilder or StringBuffer of whose objects can be converted into the string.

Approaches:

  1. Converting User-defined class object to String
  2. Converting StringBuilder(Predefined class) object to String

Method 1: Using toString() method or String.valueOf(object_name) method.

Java 
// Java Program to convert pre defined class object
// (Helper class) to string using value() method

class GFG {

    // Main driver method
    public static void main(String[] args)
    {
        // Object of helper class
        Helper help = new Helper();

        // converting object to string
        // using toString() method
        String s1 = help.toString();

        // converting object to string
        // using valueOf() method
        String s2 = String.valueOf(help);

        // Printing the converted string
        System.out.println(
            "Converted string object || using toString() Method: " + s1);

        // Printing the converted string
        System.out.println(
            "Converted string object || using valueOf() Method: " + s2);
    }
}

class Helper {
    // To make class object in main
}

Output
Converted string object || using toString() Method: Helper@214c265e
Converted string object || using valueOf() Method: Helper@214c265e

Method 2: Converting StringBuilder(Predefined class) object to String.

The StringBuilder in Java represents a mutable sequence of characters. Since the String Class in Java creates an immutable sequence of characters, the StringBuilder class provides an alternative to String Class, as it creates a mutable sequence of characters.

Class Hierarchy:

java.lang.Object
 ↳ java.lang
    ↳ Class StringBuilder

Example: 

Java 
// Java Program to convert StringBuilder object to string

class GFG {

    // Main driver method
    public static void main(String[] args)
    {
        /* String taken for consideration */
        String s = "Geeks For Geeks";

        // Passing string s to StringBuilder class object
        StringBuilder sb = new StringBuilder(s);

        // Converting the object to string
        // Converting StringBuilder to string
        String objToString = sb.toString();

        // Printing the strings to verify
        System.out.println("String: " + s);
        System.out.println("Converted String: "
                           + objToString);
    }
}

Output
String: Geeks For Geeks
Converted String: Geeks For Geeks

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lavishgarg26
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