In Java, given the parameters:I'm having a bit of trouble how to check if the inputs would be null for Constructor A and how to create the copy constructor for Constructor C. Otherwise, is the rest of the program fine for the specific instructions? public class Dog {}// Variablesprivate String name;private Double length;private Double weight;private static int totalDogs = 0;// Constructorspublic Dog (String name, Double length, Double weight) {this.name;this.length;this.weight;}public Dog() {this ("Clifford", 5.0, 12.0);}public String formatLength() {}int feet = (int) (length / 12);double inches = length % 12;inches = (int) (inches * 100.0) / 100.0;return String.format("%d ft %.2f in", feet, inches);}public String formatWeight() {int pounds = (int) (weight / 16);double ounces = weight % 16;ounces = (int) (ounces * 100.0) / 100.0;if (pounds == 1) {return String.format("%d lb %.2f oz", pounds, ounces);} else {return String.format("%d lbs %.2f oz". pounds, ounces);}}public String toString() {return String.format("I'm a talking Dog named %s. My length is %s and my weight is %s.",name, format Length(), formatWeight()); Variables:• String name - the name of the dog (can not change once set)This field should be visible to any descendant classes.An invalid value should default this field to “Clifford”.• Double length -the end-to-end length of the dog in inches.This field should be visible to any descendant classes.An invalid value should default this field to 8.0.A value is invalid if it is an empty String, blank String, or null.• Double weight -the weight of the Dog in ouncesA value is invalid if it is not a number, infinite, nonpositive, or null. (Double API)-This field should be visible to any descendant classes.An invalid value should default this field to 2.0.A value is invalid if it is not a number, infinite, nonpositive, or null.• int totalDogs - a value tracking the number of dogs that have been introduced to the yard.This variable should only be subject to modification in the body of Dog constructors.(Consider whatkeyword enables a value to be tracked at the class, rather than at an instance level.)Constructors:A) A constructor that takes in name, length, and weight.B) A constructor that takes in no parameters and sets name to "Clifford”, length to 5.0, and weight to 12.0.C) A copy constructor that deep copies all necessary instance fields. (Assume inputs not null)Methods:• formatLengthReturns the length of the dog as a String, formatted precisely as follows "feet" ft "inches" in"feet should be displayed as an integer, and inches should be displayed to 2 decimal places with rounding.(String API)format WeightReturns the weight of the dog as a String, formatted precisely as follows "pounds" lbs "ounces" ozIf the weight of the dog is only one pound, the unit should instead be“lb”.pounds should be displayed as an integer, and ounces should be displayed to 2 decimal places withrounding.• toStringOverrides the corresponding method in its super class, such that a String with the following format isreturned without trailing or leading whitespace):"I'm a talking dog named “name” My length is "feet" ft "inches" in and my weight is "pounds" lbs" ouncesoz."

Checking for null inputs for Constructor A: In Java, you can check if an object is null directly…

Variables: • String name - the name of the dog (can not change once set) This field should be visible to any descendant classes. An invalid value should default this field to "Clifford". A value is invalid if it is an empty String, blank String, or null. • Double length -the end-to-end length of the dog in inches. This field should be visible to any descendant classes. An invalid value should default this field to 8.0. A value is invalid if it is not a number, infinite, nonpositive, or null. (Double API) • Double weight -the weight of the Dog in ounces This field should be visible to any descendant classes. An invalid value should default this field to 2.0. A value is invalid if it is not a number, infinite, nonpositive, or null. • int totalDogs - a value tracking the number of dogs that have been introduced to the yard. This variable should only be subject to modification in the body of Dog constructors.(Consider what keyword enables a value to be tracked at the class, rather than at an instance level.) Constructors: A) A constructor that takes in name, length, and weight. B) A constructor that takes in no parameters and sets name to "Clifford", length to 5.0, and weight to 12.0. C) A copy constructor that deep copies all necessary instance fields. (Assume inputs not null) Methods: • formatLength Returns the length of the dog as a String, formatted precisely as follows "feet" ft "inches" in" feet should be displayed as an integer, and inches should be displayed to 2 decimal places with rounding. (String API) format Weight .toString Returns the weight of the dog as a String, formatted precisely as follows "pounds" lbs "ounces" oz If the weight of the dog is only one pound, the unit should instead be❝lb". pounds should be displayed as an integer, and ounces should be displayed to 2 decimal places with rounding. Overrides the corresponding method in its super class, such that a String with the following format is returned without trailing or leading whitespace): "I'm a talking dog named "name" My length is "feet" ft "inches" in and my weight is "pounds" lbs" ounces