Java Program to convert double type variables to string

Example 1: Java Program to Convert double to string using valueOf()

class Main {
  public static void main(String[] args) {

    // create double variable
    double num1 = 36.33;
    double num2 = 99.99;

    // convert double to string
    // using valueOf()
    String str1 = String.valueOf(num1);
    String str2 = String.valueOf(num2);

    // print string variables
    System.out.println(str1);    // 36.33
    System.out.println(str2);    // 99.99
  }
}

In the above example, we have used the valueOf() method of the String class to convert the double variables into strings.

Note: This is the most preferred way of converting double variables to string in Java.

Example 2: Java Program to Convert double to string using toString()

We can also convert the double variables into strings using the toString() method of the Double class. For example,

class Main {
  public static void main(String[] args) {

    // create double variables
    double num1 = 4.76;
    double num2 = 786.56;

    // convert double to string
    // using toString()
    String str1 = Double.toString(num1);
    String str2 = Double.toString(num2);

    // print string variables
    System.out.println(str1);    // 4.76
    System.out.println(str2);    // 786.56
  }
}

Here, we have used the toString() method of the Double class to convert the double variables into a string.

The Double is a wrapper class in Java. To learn more, visit the Java Wrapper Class.

Example 3: Java Program to Convert double to String using + Operator

class Main {
  public static void main(String[] args) {

    // create double variables
    double num1 = 347.6D;
    double num2 = 86.56D;

    // convert double to string
    // using + sign
    String str1 = "" + num1;
    String str2 = "" + num2;

    // print string variables
    System.out.println(str1);    // 347.6
    System.out.println(str2);    // 86.56
  }
}

Notice the line,

String str1 = "" + num1;

Here, we are using the string concatenation operation to convert a double variable into the string. To learn more, visit Java String concatenation.

Example 4: Java Program to Convert double to String using format()

class Main {
  public static void main(String[] args) {

    // create a double variable
    double num = 99.99;

    // convert double to string using format()
    String str = String.format("%f", num);

    System.out.println(str);    // 99.990000
  }
}

Here, we have used the format() method to format the specified double variable into a string. To learn more about formatting string, visit Java String format().