ZCW-Arrays-StringArrayUtilities-BlueJ/StringArrayUtils.java

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

        first += array[0];
        return first;
    }

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

        second += array[1];

        return second;
    }

    /**
     * @param array array of String objects
     * @return last element in specified array
     */ // TODO
    public static String getLastElement(String[] array) {
        String last = "";

        last += array[array.length-1];
        return last;
    }

    /**
     * @param array array of String objects
     * @return second to last element in specified array
     */ // TODO
    public static String getSecondToLastElement(String[] array) {
        String secLast = "";

        secLast += array[array.length-2];
        return secLast;
    }

    /**
     * @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 contain = false;

        for(String s : array){
            if(s==value){
                contain = true;

            }

        }

        return contain;
    }

    /**
     * @param array of String objects
     * @return an array with identical contents in reverse order
     */ // TODO
    public static String[] reverse(String[] array) {

        String reversal;

        for(int i = 0; i<array.length/2; i++){
            reversal = array[i];
            array[i] = array[array.length - i -1];
            array[array.length - i -1] = reversal;
        }

        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) {
        boolean pal = false;

        String reversal;

        for(int i = 0; i<array.length/2; i++){

            if(array[i] == array[array.length - i -1]){
                pal = true;
            }

        }
        return pal;
    }

    /**
     * @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) {
        boolean pan = false;

        StringBuilder build = new StringBuilder();

        for(String s : array){
            build.append(s);
        }

        String ofArray = "";
        ofArray = build.toString();
        for(char i = 'A'; i <= 'Z'; i++){ 
            if((ofArray.indexOf(i) < 0) && (ofArray.indexOf((char)(i+32)) < 0))
            { // goes thru the ASCII list
                pan = false;
            }
            else{
                pan = true;
            }
        }
        return pan;

    }

    /**
     * @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 occurs = 0;

        for(int i=0; i<array.length; i++){
            if(value.equals(array[i])){
                occurs += 1 ;
            }

        }

        return occurs;
    }

    /**
     * @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) {
        int count = 0;
        int occur = getNumberOfOccurrences(array, valueToRemove);

        String[] exclude = new String[array.length - occur];
        for(String i : array){
            if(i != valueToRemove){ 

                exclude[count] = i;
                count++;

            }

        }

        return exclude;
    }

    /**
     * @param array array of chars
     * @return array of Strings with consecutive duplicates removes
     */ // TODO
    public static String[] removeConsecutiveDuplicates(String[] array) {
        String[] excluded = new String[array.length];
        int newArrIndex = 0;
        excluded[newArrIndex] = array[0];

        newArrIndex++;
        for(int i = 1; i<array.length; i++){
            if(!(excluded[newArrIndex-1]).equals(array[i])){
                excluded[newArrIndex] = array[i];
                newArrIndex++;
                
            }    
        }
        
        String[] newArr = new String[newArrIndex];
        System.arraycopy(excluded, 0, newArr, 0, newArrIndex);
        
        return newArr;

    }

    /**
     * @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) {
        String[] newArr = new String[array.length]; 
        
        
        return null;
    }

}