import com.sun.xml.internal.fastinfoset.util.CharArray;

import com.sun.xml.internal.fastinfoset.util.CharArrayString;

public class StringUtil

{

public static void main(String[] args)

{

System.out.println("Welcome to StringUtil");

System.out.println();

getFirstCharacter("Goodbye");

getFirstCharacter("Hello");

System.out.println();

getLastCharacter("Hello");

getLastCharacter("Goodbye");

System.out.println();

System.out.println(getFirstTwoCharacters("Hello"));

System.out.println(getFirstTwoCharacters("Goodbye"));

System.out.println();

System.out.println(getLastTwoCharacters("Goodbye"));

System.out.println(getLastTwoCharacters("Hello"));

System.out.println();

System.out.println(getFirstThreeCharacters("Hello"));

System.out.println(getFirstThreeCharacters("Goodbye"));

System.out.println();

System.out.println(printCharacters("Hello"));

System.out.println(printCharacters("Goodbye"));

System.out.println();

printPhoneNumber("501-555-0100");

printPhoneNumber2("5015550100");

System.out.println();

findFirstE("Hello");

findFirstE("Goodbye");

System.out.println();

System.out.println(isFinn("Finn"));

System.out.println(isFinn("Jake"));

System.out.println();

System.out.println(reverse("Finn"));

System.out.println();

System.out.println(isPalindrome("Finn"));

System.out.println(isPalindrome("dad"));

System.out.println();

String[] wordArray = new String[4];

wordArray[0]="pickle";

wordArray[1]="learn";

wordArray[2]="education";

wordArray[3]="coding";

System.out.println("The result is "+allLetters(wordArray));

}

private static String getFirstCharacter(String value)

{

String word = "Hello";

String newWord = "Goodbye";

System.out.println(word.substring(0, 1));

System.out.println(newWord.substring(0, 1));

return value.substring(0, 1);

}

private static String getLastCharacter(String value)

{

int startIndex = value.length() - 1;

return value.substring(startIndex, startIndex + 1);

}

private static String getFirstTwoCharacters(String value)

{

return value.substring(0, 2);

}

private static String getLastTwoCharacters(String value)

{

int startIndex = value.length() - 2;

return value.substring(startIndex, startIndex + 2);

}

private static String getFirstThreeCharacters(String value)

{

return value.substring(0, 3);

}

private static String printCharacters(String value)

{

for (int i = 0; i < value.length(); i++)

{

char letter = value.charAt(i);

System.out.println(letter + ":" + i);

}

return value;

}

private static void printPhoneNumber(String value)

{

System.out.print("Area Code: " + value.substring(0, 3) + " ");

System.out.print("Exchange: " + value.substring(4, 7) + " ");

System.out.println("Line Number: " + value.substring(8, 12));

System.out.println();

}

//9-S-1

private static void printPhoneNumber2(String value2)

{

System.out.print("Area Code: " + value2.substring(0, 3) + " ");

System.out.print("Exchange: " + value2.substring(3, 6) + " ");

System.out.println("Line Number: " + value2.substring(6, 10));

System.out.println();

}

private static void findFirstE(String e)

{

e = "Hello";

String e2 = "Goodbye";

int index = e.indexOf("e");

int index2 = e2.indexOf("e");

System.out.println("First e in " + e + " is at position: " + index);

System.out.println("First e in " + e2 + " is at position: " + index2);

}

private static boolean isFinn(String value)

{

if (value.equals("Finn"))

{

return true;

} else

{

return false;

}

}

// 9-S-2

private static String reverse(String word)

{

String reverse = new StringBuffer(word).reverse().toString();

return reverse;

}

// 9-S-3

private static boolean isPalindrome(String value)

{

String reverse = new StringBuffer(value).reverse().toString();

if (value.equals(reverse))

{

return true;

} else

{

return false;

}

}

///don't think this is working correctly

private static boolean allLetters(String[] wordArray)

{

String[] word = "learn".split("");

for (int i = 0; i < wordArray.length - 1; i++)

{

for (String words : wordArray)

{

if (words.startsWith(word.toString()))

{

return true;

} else

{

return false;

}

}

}

return false;

}

}