The compareTo method of the Double class is used to compare the current object’s double value to another double value.
public int compareTo(Double b);
This method returns:
0 if the current object value and passed argument value are the same.
A positive value if the current object value is greater than the argument.
A negative value if the current object value is less than the argument value.
When comparing this method
, 0.0d is considered to be greater than -0.0d.
When comparing this method, Double.NaN is considered to be equal to Double.NaN and greater than all other values (including Double.POSITIVE_INFINITY).
The code below uses the compareTo method to compare the double values.
class DoubleCompareToExample {public static void main( String args[] ) {Double val = 10.55d;System.out.println("10.55, 10.55 : " + val.compareTo(10.55d));System.out.println("10.55, 11.55 : " + val.compareTo(11.55d));System.out.println("10.55, 9.55 : " + val.compareTo(9.55d));System.out.println("10.55, Double.NaN : " + val.compareTo(Double.NaN));}}
In the code above:
In line 3, we create a Double object variable with the name val and value 10.55.
In line 4, we call the compareTo method on the val object with 10.55d as the argument. We get 0 as a result because both the values are equal.
In line 5, we call the compareTo method on the val object with 11.55d as the argument. We get -1 as a result because the value of val is less than the argument.
In line 6, we call the compareTo method on the val object with 9.55d as the argument. We get 1 as a result because the value of val is greater than the argument.
In line 7, we call the compareTo method on the val object with Double.NaN as the argument. We get -1 as a result because Double.NaN is considered to be equal to Double.NaN and greater than all other values (including Double.POSITIVE_INFINITY).