*6.19 (The MyTriangle class) Create a class named MyTriangle that contains the
following two methods:
/** Return true if the sum of any two sides is greater than the third side. */
public static boolean isValid( double side1, double side2, double side3)
/** Return the area of the triangle. */
public static double area( double side1, double side2, double side3)
Write a test program that reads three sides for a triangle and computes the area if the input is valid. Otherwise, it displays that the input is invalid. The formula for computing the area of a triangle is given in Programming Exercise 2.19.
/** Return true if the sum of any two sides is greater than the third side. */
public static boolean isValid( double side1, double side2, double side3)
/** Return the area of the triangle. */
public static double area( double side1, double side2, double side3)
Write a test program that reads three sides for a triangle and computes the area if the input is valid. Otherwise, it displays that the input is invalid. The formula for computing the area of a triangle is given in Programming Exercise 2.19.
import java.util.Scanner; public class MyTriangle { public static void main(String[] args) { Scanner input = new Scanner(System.in); System.out.print("Enter three edges of the triangle:"); double side1 = input.nextDouble(); double side2 = input.nextDouble(); double side3 = input.nextDouble(); if (!isValid(side1, side2, side3)) { System.out.print("The input is invalid"); System.exit(0); } System.out.print("The area of the triangle is " + area(side1, side2, side3)); } public static boolean isValid(double side1, double side2, double side3) { return !(side1 > side2 + side3 || side2 > side1 + side3 || side3 > side1 + side2); } public static double area(double side1, double side2, double side3) { double s = (side1 + side2 + side3) / 2; double area = Math.sqrt(s * (s - side1) * (s - side2) * (s - side3)); return area; } }
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