Write a Java program that calculates and prints the sum of all elements in an integer array.
Create a program that finds and prints the maximum value in an array of integers.
Write a program that reverses the order of elements in an array. For example, if the input array is [1, 2, 3, 4, 5], the output should be [5, 4, 3, 2, 1].
Develop a program that copies the contents of one array into another array of the same size. Then, print both arrays to verify the copy operation.