Get String Representation of Numbers Using toString in Java

String representation of numbers is nothing but converting numeric values into their corresponding string values using methods like toString(). In Java, this can be done by calling the toString() method on wrapper classes such as Integer, Float, and Double.

The toString() method is an important method of Object class and it can be used to return the string or textual representation of an object. The object class's toString() method returns a string as the name of the specified object's class which is followed by ?@' sign and the hashcode of the object (java.lang.String;@36f72f09)

String Representation Using toString() Method

To get the string representation of numbers, we can use the toString() method. It is useful when the string consists of numbers taken from different variables. In such cases, the numbers can be converted to strings and concatenated to create a combined or formatted string.

Following is the syntax of the toString() method -

ClassName.toString(value);

Here,

• className: The name of the class on which the method is called, such as Integer, Double, Float, etc.
• value: The value parameter refers to the actual data (or literal) that you pass into a method when calling it.

Example 1: String Representation of Integer Values

The following program uses the toString() method on the Integer wrapper classes to create a string representation of the given numbers 50 and 99999:

public class ToStringMethodTest {
   public static void main(String args[]) {
      int num1 = 50;
      Integer num2 = 99999;
	  
      //converting numbers to string format by toString()
      String str_int1 = Integer.toString(num1);
      String str_int2 = num2.toString();

      System.out.println("int to string = " + str_int1);
      System.out.println("Integer to string = " + str_int2);
   }  
}

Output

The above program produces the following output:

int to string = 50
Integer to string = 99999

Example 2: String Representation of Decimal Values

The following program uses the toString() method on the Float and Double wrapper classes to create a string representation of the given numbers 80.55f and 3256522.44d:

public class ToStringMethodTest {
   public static void main(String args[]) {
      float flt1 = 50.75f;
      Float flt2 = 80.55f;
      double dbl1 = 3256522.44d;
	  
      //converting numbers to string format by toString()
      String str_flt1 = Float.toString(flt1);
      String str_flt2 = flt2.toString();
      String str_dbl1 = Double.toString(dbl1);
	  
      System.out.println("float to string = " + str_flt1);
      System.out.println("Float to string = " + str_flt2);
      System.out.println("double to string = " + str_dbl1);
   }  
}

Following is the output of the above program -

float to string = 50.75
Float to string = 80.55
double to string = 3256522.44