1. Java

2. PRACTICE 1
(Selecting geometric figures) Write a program that draws various figures. The user selects a figure from a radio button and specifies whether it is filled in a check box.
FigurePanel
Panel with
FlowLayout

3. PRACTICE 2
(Summing series) Write a recursive method to compute the following series:

4. PRACTICE 3
(Summing the digits in an integer using recursion) Write a recursive method
that computes the sum of the digits in an integer. Use the following method
header:
public static int sumDigits(long n)
For example, sumDigits(234) returns = 9.

5. PRACTICE 4
(Finding the largest number in an array) Write a recursive method that returns the largest integer in an array.