Question

JAVA

• The class will have a constructor BMI(String name, double height, double weight).
• The class should have a public instance method, getBMI() that returns a double reflecting the person's BMI (Body Mass Index = weight (kg) / height2 (m2) ).
• The class should have a public toString() method that returns a String like Fred is 1.9m tall and is 87.0Kg and has a BMI of 24.099722991689752Kg/m^2 (just print the doubles without special formatting).
• Implement this class (if you wish you may implement a main method that demonstrates its use).

Here is my code:

public class BMI {
    private String name;
    private Double height;
    private Double weight;


    Double getBMI(){
        return weight/(height*height);
    }
    public BMI(String name, Double height, Double weight){
        this.name = name;
        this.height = height;
        this.weight = weight;
    }

    @Override
    public String toString(){
        return name + " is " + height +"m tall and " + weight + "kg and has a BMI of" + getBMI() ;
    }
}

Answer 1

Have a look at the below code. I have put comments wherever required for better understanding.

// create class
class BMI{
    // create instance variables
    public String name;
    public double height;
    public double weight;
    // create constructor
    BMI(String name,double height,double weight){
        this.name = name;
        this.height = height;
        this.weight = weight;
    }
    // create get BMI method
    public double getBMI(){
        double numerator = this.weight;
        double denominator = this.height*this.height;
        return numerator/denominator;
    }
    // create toString method
    public String toString(){
        return this.name + " is " + this.height +"m tall and " + this.weight + "kg and has a BMI of " + getBMI();
    }
}

// create main class
class Main {
  public static void main(String[] args) {
    // create an object BMI class
    BMI bmi = new BMI("Fred",1.9,87.0);
    // call the toString method...
    System.out.println(bmi.toString());
  }
}

Happy Learning!