I need to complete the following methods in the ArrayExercises class: public sta

Question

I need to complete the following methods in the ArrayExercises class:

public static void reverseOrder (Character[] symbols)
{
This method should reverse the order of elements in the input array.
}
public static int[] histogram (int[] ages)
{
This method should count up how many times each integer occurs within the input array, and return a new array with these counts. The new array size should be one more than the maximum value in the input array. (It will be a different size than the input array!) Each element in this new array should contain a count, element i should contain the number of times that i appears in the input array. The input array *should not be changed.
Example: If the input array contains:

4 0 2 3 3 2 1 3 4 6 2 5 3 3 2
then the output array would contain:

1 1 4 5 2 1 1
(There is 1 zero, 1 one, 4 twos, 5 threes, 2 fours, one five, and one six in the input array.)
}
public static File[] getUnique(File[] files)
{
This method should create and return a new array of File objects. The array should contain the unique File objects found in the input array. The input array should not be changed.

Note that you do not need to create new File objects, just a new array of File objects.
}
public static Rectangle findSmallest(Rectangle[] rectangles)
{
This method should find and return the smallest rectangle from the array of rectangles. The smallest rectangle is the rectangle with the smallest area. The input array should not be changed.

Each method has a specific set of requirements listed in the JavaDoc comments for the method. (You may view an on-line version of these JavaDoc comments here. Make sure you follow them exactly. (Your method should behave exactly as described, with no additional functionality.)

Common sense is required - the assignment is not meant to be overly complex. You should keep your solutions simple, and don't do any extra work that you don't need to. (In particular, you don't need to worry about throwing exceptions, testing input data for validity, or printing out messages in the class.)
}

Explanation / Answer

ArrayExercise.java ************************ package util; import java.io.File; import java.util.ArrayList; import java.util.Arrays; import java.util.Collection; import java.util.Collections; import java.util.HashMap; import java.util.HashSet; import java.util.Iterator; import java.util.List; import java.util.Map; public class ArrayExercise { /** * This method is used to display the symbols in the reverse order * * @param symbols */ public static void reverseOrder(Character[] symbols) { Arrays.sort(symbols); System.out.println("reverse Order of symbols are"); for (int i = 0; i

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