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Java Double class compareTo() method with example

Double class compareTo() method: Here, we are going to learn about the compareTo() method of Double class with its syntax and example.
Submitted by Preeti Jain, on September 24, 2019

Double class compareTo() method

  • compareTo() method is available in java.lang package.
  • compareTo() method is used to check equality or inequality for this Double-object against the given Double-object mathematically or in other words, we can say this method is used to compare two Double objects.
  • compareTo() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.
  • compareTo() method does not throw an exception at the time of comparing Double-object.


    public int compareTo(Double value2);


  • Double value2 – represents the Double object to compare with.

Return value:

The return type of this method is int, it returns an integer value. It returns 0 if value2 is mathematically equal to value1 (this object), it returns value < 0 if value2 is mathematically greater than value1 (this object), it returns value > 0 if value2 is mathematically less than value1 (this object).


// Java program to demonstrate the example 
// of compareTo(Double value2) method of Double class

public class CompareToOfDoubleClass {
    public static void main(String[] args) {
        // Variables initialization
        double d1 = 18.20;
        double d2 = 20.20;

        // Double instance 
        Double value1 = new Double(d1);
        Double value2 = new Double(d2);

        // It compare two Double objects and placed the 
        // result in another variable (compare) of integer type
        int compare = value1.compareTo(value2);

        // Display result
        System.out.println("value1.compareTo(value2): " + compare);


        if (compare == 0)
            System.out.println("value1 is equal to value2");

        else if (compare < 0)
            System.out.println("value1 is less than value2");
            System.out.println("value1 is greater than value2");


value1.compareTo(value2): -1

value1 is less than value2

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