Please do it by Java

Write a program that displays the result of 4 x (1-5 2. i can be computed using the following formula: 1 1 1 1 1 n = 4 x 1--+ + 3 5 7 9 11 1 1 1 + + 5 7 (in Exercise_01_02.java) 3. Write a function add(a, b) where a and bare floating numbers. (in Exercise_01_03.java) 4. Write a function calculate Perimeter(radius) to calculate the perimeter of a circle. Create your own function signature (in Exercise_01_04.java, Hints: you can use Math.pl to get it) 5. Write a function calculatePi(denumerator) see series in question 2, i.e. the question in number 2 is equivalent to calculatePi(11). Create your own function signature (in Exercise_01_05.java)