Complete question:
Create the Illegal Triangle Exception class, and modify the constructor of the Triangle class to throw an Illegal Triangle Exception object if a triangle is created with sides that violate the rule as follows:
/** Construct a triangle with the specified sides */
public Triangle (double side1, double side 2, double side 3)
throws IllegalTriangleException {
// Implement it
}
Answer:
We have to guess at the original Triangle class as you didn't provide it, so I'll provide a skeleton.
For a triangle to be "legal" all sides should have a positive, non-zero length; and the sum of any two sides should be greater than the length of the third.
public class IllegalTriangleException extends Exception {
public IllegalTriangleException() {}
public IllegalTriangleException(String msg) { super(msg); }
};
public class Triangle
{
// Missing info ...
private double a, b, c;
public Triangle (double side1, double side 2, double side3 )
throws IllegalTriangleException
{
if ((side1 + side2 > side3) || (side1 + side3 > side2) || (side2+side3 > side1))
throw new IllegalTriangleException("Illegal side ratios");
if (side1 <= 0.0 || side2 <= 0.0 || side3 <= 0.0 )
throw new IllegalTriangleException("Side lengths must be >= 0");
a = side1; b = side2; c = side3;
}
};
Explanation:
