ZCW-Arrays-StringArrayUtilities-BlueJ/StringArrayUtils.java

/**
 * Created by leon on 1/29/18.
 */
import java.util.Arrays;
import java.util.*;
public class StringArrayUtils {
    /**
     * @param array array of String objects
     * @return first element of specified array
     */ // TODO
    public static String getFirstElement(String[] array) { 
        return array[0];
    }

    /**
     * @param array array of String objects
     * @return second element in specified array
     */
    public static String getSecondElement(String[] array) {
        return array[1];
    }

    /**
     * @param array array of String objects
     * @return last element in specified array
     */ // TODO
    public static String getLastElement(String[] array) {
        return array[array.length - 1];
    }

    /**
     * @param array array of String objects
     * @return second to last element in specified array
     */ // TODO
    public static String getSecondToLastElement(String[] array) {
        return array[array.length - 2];
    }

    /**
     * @param array array of String objects
     * @param value value to check array for
     * @return true if the array contains the specified `value`
     */ // TODO
    public static boolean contains(String[] array, String value) {
        boolean doesContain = false;
        for (String strings : array) {
            if (strings == value) {
                doesContain = true;
            } 
        }
        
       /* for (int i =0; i < array.length; i++) {
            if (array[i] == value) {
                doesContain = true;
            }
        }*/
        return doesContain;
    }

    /**
     * @param array of String objects
     * @return an array with identical contents in reverse order
     */ // TODO
    public static String[] reverse(String[] array) {
        for (int i = 0; i < array.length / 2; i++) {
            String hold = array[i];
            array[i] = array[(array.length - 1) - i];
            array[array.length - 1 - i] = hold;
        }
        return array;
    }

    /**
     * @param array array of String objects
     * @return true if the order of the array is the same backwards and forwards
     */ // TODO
    public static boolean isPalindromic(String[] array) {
        String [] backwardsArray;
        backwardsArray = reverse(array);
        boolean isEqual = false;
        if(Arrays.equals(array, backwardsArray)) {
            isEqual = true;
        }
       /* for (int i = 0; i < array.length / 2; i++) {
            String hold = array[i];
            backwardsArray[(array.length - 1) - i] = array[i];
            array[array.length - 1 - i] = hold;
            hold = backwardsArray[i];
        }
        boolean isEqual = false;
        if(Arrays.equals(array, backwardsArray)) {
            isEqual = true;
        }*/
        return isEqual;
    }

    /**
     * @param array array of String objects
     * @return true if each letter in the alphabet has been used in the array
     */ // TODO
    public static boolean isPangramic(String[] array) {
        return false;
    }

    /**
     * @param array array of String objects
     * @param value value to check array for
     * @return number of occurrences the specified `value` has occurred
     */ // TODO
    public static int getNumberOfOccurrences(String[] array, String value) {
        int occurred = 0;
        for (String word : array) {
            if (word == value) {
                occurred += 1;
            }
        }
        return occurred;
    }

    /**
     * @param array         array of String objects
     * @param valueToRemove value to remove from array
     * @return array with identical contents excluding values of `value`
     */ // TODO
    public static String[] removeValue(String[] array, String valueToRemove) {
        String[] removedArray = new String[array.length];
        for (int i = 0; i < array.length ; i++) {
            if (array[i] != valueToRemove) {
                removedArray[i] = array[i];
            }
        }
        for (String word : array) {
            if (word != valueToRemove) {
                
            }
        }
        return removedArray;
    }

    /**
     * @param array array of chars
     * @return array of Strings with consecutive duplicates removes
     */ // TODO
    public static String[] removeConsecutiveDuplicates(String[] array) {
       
        return null;
    }

    /**
     * @param array array of chars
     * @return array of Strings with each consecutive duplicate occurrence concatenated as a single string in an array of Strings
     */ // TODO
    public static String[] packConsecutiveDuplicates(String[] array) {
        return null;
    }

}