JAVA

Below is a source code to define a Dog class in the Java programming language. Examine the code and answer the questions below:

public class Dog extends Animal {

public int hairLength;

public Dog() {

}

public Dog(int age, String gender, int hairLength) {

super(age, gender);

this.hairLength = hairLength;

}

}

We use a String to represent gender in the Animal Class. What is wrong with this. What is the correct way of representing fixed sets of named values?