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FirstAssignment #18

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305 changes: 198 additions & 107 deletions StringArrayUtils.java
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Original file line number Diff line number Diff line change
@@ -1,107 +1,198 @@


/**
* Created by Yang on 1/23/20.
*/
public class StringArrayUtils {
/**
* @param array array of String objects
* @return first element of specified array
*/ // TODO
public static String getFirstElement(String[] array) {
return null;
}

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

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

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

/**
* @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) {
return false;
}

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

/**
* @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) {
return false;
}

/**
* @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) {
return 0;
}

/**
* @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) {
return null;
}

/**
* @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;
}


}

import java.util.ArrayList;
/**
* Created by Yang on 1/23/20.
*/
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) {
int l = array.length;
for (int j = 0; j < l / 2; j++)
{
String temp = array[j];
array[j] = array[l - j - 1];
array[l - j - 1] = temp;
}
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) {
int i = 0;
int j = array.length - 1;
while (i < j) {
if (array[i] == array[j]) {
i++;
j--;
}
else 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) {
String alphabet = "abcdefghijklmnopqrstuvwxyz";

boolean pangramic = true;
for (int i = 0; i < alphabet.length(); i++){
boolean check = false;

for (int j = 0; j < array.length; j++){

if(array[j].toLowerCase().contains(Character.toString(alphabet.charAt(i)))){
check = true;
break;
}
}
if (!check){
pangramic = false;
break;
}

}
return pangramic;
}

/**
* @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 number = 0;
for ( int i = 0; i < array.length; i++){
if (array[i] == value){
number++;
}
}
return number;
}

/**
* @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 k = 0;
int occ = getNumberOfOccurrences(array, valueToRemove);

String[] removed = new String[array.length - occ];

for(int i = 0; i < array.length; i++){
if (array[i] != valueToRemove){
removed[k] = array[i];
k++;
}

}
return removed;

}

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

ArrayList<String> arr = new ArrayList<>();

arr.add(array[0]);

for (int i = 1; i < array.length; i++) {
if (array[i-1] != (array[i])) {
arr.add(array[i]);
}
}
return arr.toArray(removed);
}

/**
* @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) {
ArrayList<String> arr = new ArrayList<>();

String[] result = {};

arr.add(array[0]);

for (int i = 1; i < array.length; i++) {
if (array[i-1] == (array[i])) {
arr.set(arr.size()-1, arr.get(arr.size()-1) + array[i]);
}
else {
arr.add(array[i]);
}
}

return arr.toArray(result);
}


}
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