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Java Double.compareTo() Method - GeeksforGeeks

Last Updated : 15 May, 2025

The Double.compareTo() method is a built-in method in Java of java.lang package. This method is used to compare two Double objects numerically. This method returns 0 if this object is equal to the argument object, it returns less than 0 if this object is numerically less than the argument object, and a value greater than 0 if this object is numerically greater than the argument object. 

In this article, we are going to learn about the Double.compareTo() method in Java with examples.

public int compareTo(Double anotherDouble)

Parameter: obj: The object that is to be compared to. 

Return Values: The function can return three values:

• equal to 0: Object is equal to the argument object.
• less than 0: Object is less than the argument object.
• greater than 0: Object is greater than the argument object.

Note: This method only accepts a Double object as an argument. If we pass anything else or no argument at all, it will result in a compile-time error.

Example 1: In this example, we are going to compare two different Double objects.

// Java program to demonstrate Double.compareTo() method
import java.lang.Double;

public class Geeks {
    
    public static void main(String[] args) {
        
        Double obj1 = new Double(124);
        Double obj2 = new Double(167);

        int compareValue = obj1.compareTo(obj2);

        if (compareValue == 0)
            System.out.println("obj1 and obj2 are equal");
        else if (compareValue < 0)
            System.out.println("obj1 is less than obj2");
        else
            System.out.println("obj1 is greater than obj2");
    }
}

obj1 is less than obj2

Example 2: In this example, we are going to pass no argument and see what happens.

// No argument passed
import java.lang.Double;

public class Geeks {
    
    public static void main(String[] args) {
        Double obj1 = new Double(124);

        // This will result in a compile-time error
        int result = obj1.compareTo(); 
    }
}

Output:

error: method compareTo in class Double cannot be applied to given types;
        int result = obj1.compareTo(); 
                         ^
  required: Double
  found: no arguments
  reason: actual and formal argument lists differ in length

Example 3: In this example, we are going to pass a non-Double object.

// Passing incompatible type
import java.lang.Double;

public class Geeks {
    
    public static void main(String[] args) {
        Double obj1 = new Double(124);

        // This will also result in a compile-time error
        int result = obj1.compareTo("gfg"); 
    }
}

Output:

error: incompatible types: String cannot be converted to Double

Important Points:

• Always make sure the object passed to compareTo() method is of type Double.
• Do not use raw objects like Object in compareTo() for wrapper classes, always prefer using the typed version.
• For comparing primitive double values directly, consider using Double.compare(double d1, double d2).

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