How to Convert Object to String in Java

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  4. How to Convert Object to String in Java
Mohammad Irfan Feb 02, 2024
Java Java Object Java String
  1. Convert Object to String Using the valueOf() Method in Java
  2. Convert Object to String Using the + Operator in Java
  3. Convert Object to String Using the toString() Method in Java
  4. Convert Object to String Using the toString() Method in Java
  5. Convert Object to String Using toString() Method in Java
  6. Convert Object to String Using the join() Method in Java
How to Convert Object to String in Java

This tutorial introduces how to convert an object to a string in Java.

Convert Object to String Using the valueOf() Method in Java

The valueOf() method of the String class can convert an object to a string. See the example below.

public class SimpleTesting {
  public static void main(String[] args) {
    Object obj = "DelftStack Portal";
    System.out.println("Object value: " + obj);
    String str = String.valueOf(obj);
    System.out.println("String value: " + str);
  }
}

Output:

Object value: DelftStack Portal
String value: DelftStack Portal

Convert Object to String Using the + Operator in Java

In Java, the plus operator + concatenates any type value with the string and returns a resultant string. We can use it to convert an object to a string too. See the below example.

public class SimpleTesting {
  public static void main(String[] args) {
    Object obj = "DelftStack Portal";
    System.out.println("Object value: " + obj);
    String str = "" + obj;
    System.out.println("String value: " + str);
  }
}

Output:

Object value: DelftStack Portal
String value: DelftStack Portal

Convert Object to String Using the toString() Method in Java

The toString() method of the Object class converts any object to the string. See the below example.

public class SimpleTesting {
  public static void main(String[] args) {
    Object obj = "DelftStack Portal";
    System.out.println("Object value: " + obj);
    String str = obj.toString();
    System.out.println("String value: " + str);
  }
}

Output:

Object value: DelftStack Portal
String value: DelftStack Portal

Convert Object to String Using the toString() Method in Java

An object can be of any type. For example, if we have an integer object and want to get its string object, use the toString() method. See the example below.

public class SimpleTesting {
  public static void main(String[] args) {
    Integer iVal = 123;
    System.out.println("Integer Object value: " + iVal);
    String str = iVal.toString();
    System.out.println("String value: " + str);
  }
}

Output:

Hello
This
is
DelfStack

Convert Object to String Using toString() Method in Java

This example explains how to convert a user-defined object to a string using the toString() method. See the example below.

class Employee {
  String fName;
  String lName;

  public Employee(String fName, String lName) {
    this.fName = fName;
    this.lName = lName;
  }

  public String getfName() {
    return fName;
  }
  public void setfName(String fName) {
    this.fName = fName;
  }
  public String getlName() {
    return lName;
  }
  public void setlName(String lName) {
    this.lName = lName;
  }

  @Override
  public String toString() {
    return "Employee [fName=" + fName + ", lName=" + lName + "]";
  }

  public String getString() {
    return toString();
  }
}

public class SimpleTesting {
  public static void main(String[] args) {
    Employee employee = new Employee("Rohan", "Mosac");
    System.out.println(employee.getString());
  }
}

Output:

Employee [fName=Rohan, lName=Mosac]

Convert Object to String Using the join() Method in Java

Here, we convert an ArrayList object to a string by using the join() method. The join() method of the String class returns a string after joining them into a single String object. See the example below.

import java.util.ArrayList;
import java.util.List;
public class SimpleTesting {
  public static void main(String[] args) {
    List<String> list = new ArrayList<>();
    list.add("Sun");
    list.add("Moon");
    list.add("Earth");
    System.out.println("List object: " + list);
    // list object to string
    String str = String.join(",", list);
    System.out.println("String: " + str);
  }
}

Output:

List object: [Sun, Moon, Earth]
String: Sun,Moon,Earth

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