ArraysGoneWild

ArraysGoneWild

This is a series of java array problems to prove your array knowledge.

You may ONLY use the information in the DocumentationOnArrays folder only...

NO GOOGLE on this lab.

At this point you should be able to write up these methods without searching for code patterns on google.

NO STACK-OVERFLOW on this lab.

At this point you should be able to write up these methods without searching for code patterns on StackOverflow.

At this point in the cohort, you should be able to glance at the problem, write a couple tests, nd then implement the method.

For each problem.

For each of these problems, you need to write the method itself, and two tests for each method. If the method is named sumValuesOfArray, you should write two test methods:

• test1sumValuesOfArray
• test2sumValuesOfArray

Problem list

Write a method in the Arraz class for each of these:

• sum values of an array of integers sumValuesOfArray
• sum values of an array of doubles sumDoublesOfArray
• calculate the average value of an integer array - return an integer averageOfArray
• calculate the average value of an double array - return an double doubleAverageOfArray
• to test if an integer array contains a specific value, pass both array and value as arguments containsValue
• reverse an array of integer values reverseArray

• Make a method named getOddEvensOfArray

  • Method takes an argument of array of Integer objects
  • Method returns an object of type OddEven such that OddEven stores the number of odds and evens in the respective fields

• Example of OddEven class

  public class OddEven{
  public int odds;
  public int evens;
  }
  

• find the index of an array element, pass both array and value as arguments findIndexOf

• copy an array by iterating the array copyArrayByInterator

• copy an array by looping thru the array copyArrayByLoop

• remove a specific element from an array removeElementFromArray

• insert an element into an array a specific position insertIntoArrayAt

• find the maximum and minimum value of an array findMaxMinOfArray return a

public class MaxMin{
    int max, max;
    // ommitted setters, getters, and constructors for brevity
}

• remove duplicate elements from an array, return new array removeDupesFromArray (make it an array of Integers)

• find the second largest element in an array of Doubles find2ndLargestValueFromArray

• convert an array to ArrayList makeMeAnArrayListFromArray

• convert an ArrayList to an array makeMeAnArrayFromArrayList

• test the equality of two arrays check2ArraysForEqual

• compute the average value of an array of integers except the largest and smallest values (be thinking of code re-use for this one) averageArrayWithoutMaxMin

• check if an array of integers contains two specified elements: 65 and 77, returns a boolean arrayHas65and77

• check if the sum of all the 10's in the array is exactly 30. Return false if the condition does not satisfy, otherwise true. theTotalofTensIs30

• find smallest and second smallest elements of a given array

• copy an array of integers, reverse it, and return it. makeMeACopyPlease

• remove the last element from an array of integers, return a copy removeLastItemAndCopy

• remove the first element from an array of integers, return a copy removeFirstItemAndCopy

• insert a new element at the start of an array, return a copy insertAtStartAndCopy

• insert a new element at the end of an array, return a copy insertAtEndAndCopy

• separate even and odd numbers of an given array of integers. Put all even numbers first, and then odd numbers sortArrayIntoEvensThenOdds

If you need an array of ints use this one.

int[] spiffyHandyIntArray = new int[] {4,5,102,6,-7,12,-32,92,8};

If you need an array of Doubles use this one.

Double[] spiffyHandyDoubleArray = new Double[] {1.0, 0.5, 3.6, 38.4, 17.3, 62.0, 9.0, 3.375, 0, 3.14159};

But, if you don't like these arrays, feel free to make your own.