BeginnersBook

Java Object to String Conversion

By Chaitanya Singh | Filed Under: java

In this guide, we will learn how to convert Object to String in Java. We will also see program for StringBuffer and StringBuilder object to String conversion.

Java Program to convert an object of a class to String

Here, we are using toString() and valueOf() methods to convert the object of Student class to a String.

class Student {
  // A Student class
}
class JavaExample {
  public static void main(String[] args)
  {
    // Object of Student class
    Student obj = new Student();

    // converting the object of Student class to String
    // using toString() method
    String str1 = obj.toString();

    // converting object of Student class to String
    // using valueOf() method
    String str2 = String.valueOf(obj);
    
    System.out.println("Conversion using toString() Method: "+str1);
    System.out.println("Conversion using valueOf() Method: "+str2);
  }
}

Output:

Java convert object to string example output

Java Program to convert object of StringBuilder/StringBuffer to String

StringBuilder and StringBuffer are used to represent mutable Strings, while the String is an immutable sequence of characters. In this example, we will see how to convert StringBuilder/StringBuffer object to String.

Methods used in this program:

class JavaExample {
  public static void main(String[] args)
  {
    //sb1 is an object of StringBuilder class
    StringBuilder sb1 = new StringBuilder("BeginnersBook");

    //sb2 is an object of StringBuffer class
    StringBuilder sb2 = new StringBuilder("Best Tutorial Website");

    //Conversion using toString() method
    String str1 = sb1.toString();
    String str2 = sb2.toString();

    // Prints Strings after conversion
    System.out.println("StringBuilder to String: " + str1);
    System.out.println("StringBuffer to String: " + str2);
  }
}

Output:

StringBuilder/StringBuffer object to String Output