Problem 1. Fahrenheit to Celsius (Fah ToCel.java) Write a Java class named FahToCel that reads a Fahrenheit degree in a double value from the console, then converts it to Celsius and displays the result. The formula for the conversion is as follows: 5 celsius = *(fahrenheit -32) Outputs: Please enter a degree in Fahrenheit: 100 Fahrenheit 100.0 is 37.77777777777778 in Celsius Problem 2. Area of Triangle (AreaOfTriangle.java) Write a Java class named AreaOfTriangle that prompts the user to enter the three sides of a triangle (suppose it is valid) in double values, and displays its area. The formula for computing the area of a triangle is (a, b, c are the three sides): Area = P(p-a)(p-b)(p-c) a+b+c where,p= 2 Outputs: Please enter the three sides of a triangle: 3 4 5 The area of this triangle with sides: 3.0 4.0 5.0 is: 6.0 Problem 3. Sum of Digits (Sum OfDigits.java) Write a Java class named SumOfDigits that reads an integer between 0 and 1000 and adds all the digits in the integer. For example, if an integer is 932, the sum of all its digits is 14