Question

JAVA question

Interface and Abstract Class (20 pts): There are three types of triangles in terms of how many sides are equal: • Equilateral Isosceles Scalene There are three types of triangles in terms of the degrees of interior angles: • Right · Acute . Obtuse Right Isosceles triangle is a right triangle, as well as an isosceles triangle. Triangle 590° Right triangle Isosceles triangle Right isosceles triangle Create a public interface Triangle, add the following method signatures: • double area(): calculates and returns the area of a triangle · double perimeter(): calculates and returns the perimeter of a triangle (5 pts) Create a public abstract class Isosceles that implements Triangle, implement: . double perimeter(): calculates and returns the perimeter of a triangle • fields: longside, equalSide (5 pts) Create a public interface Right that extends Triangle, add one more method: double[] angles(): returns an array of measures of three interior angles (5 pts) Create a public class Rightisosceles that extends Isosceles and implements Right: • double area(): calculates and returns the area of a triangle double[] angles(): returns an array of measures of three interior angles fields: longside, equalSide (5 pts)

Answer 1

Java code

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package shape;

public interface Triangle
{
   double area();
   double perimeter();
}

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package shape;

public interface Right extends Triangle {
   double[] angles();
}

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package shape;

public abstract class Isosceles implements Triangle{
   double longside;
   double equalside;
   public double perimeter()
   {
       return (2*(equalside)+longside);
   }
}

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package shape;

public class RightIsosceles extends Isosceles implements Right{

   double longside;
   double equalside;
   @Override
   public double area() {
      
       double a;
       a=1/2*longside*equalside;
       return a;
   }

  

   @Override
   public double[] angles() {
      
       double t[]={90,45,45};
       return t;
   }

}

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