ZCW-Arrays-StringArrayUtilities-BlueJ/StringArrayUtils.java

 

/**
 * Created by leon on 1/29/18.
 */
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) {
        for(int i = 0; i < array.length; i++) {
            if(array[i].equals(value)) return true;
        }
        return false;
    }
    
    /**
     * @param array of String objects
     * @return an array with identical contents in reverse order
     */ // TODO
    public static String[] reverse(String[] array) {
        String[] revArray = new String[array.length];
        for (int i = 0; i < array.length; i++) {
            revArray[i] = array[array.length - 1 - i];
        }
        return revArray;
    }

    /**
     * @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) {
        
    for ( int i = 0; i < array.length / 2; i++) {
        if (array[i] != array[array.length - 1 - i]) {
          return false;
        }
    }    
    return true;
    }
    
    /**
     * @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) {
        for(char c = 'a';c <= 'z'; ++c) {
            if(array.toString().contains(String.valueOf(c))) {
                return true;
        
    }
        
    }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 num = 0;
        for (int i=0;i<array.length;i++){
            if (array[i]== value){
                num++;
            }

        }

        return num;
    }
    
    /**
     * @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[] arr = new String[array.length-1];
        String[] remArr = new String[1];
        for (int i=0;i<array.length;i++){
            if (array[i]!=valueToRemove){
                arr[i] = array[i];

            }else { remArr[i] += array[i];}

        }

        return arr;
    }

    /**
     * @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;
    }


}