How to make the last letter of a word become capitalized

Question

So I'm new to coding and my teacher asked us to make a code that does this. I need to use substring to do it.

This is what I have to do.

Example output 1: Welcome to the twist around (made up language) translation program.

Enter word to translate: Helicopter Word in twistaround: OpterhelicCR

Example output 2: Welcome to the twist around (made-up language) translation program.

Enter word to translate: Hello Word in twist around: LohelLO

Notes: Translated words are formed like this: Helicopter = OpterhelicCR First letter of the second half in uppercase: Opter First letter of the first half in lower case: helic Last letter of the first half in uppercase: C Last letter of the second half in uppercase: R

This is my code. public static void main(String[] args) { Scanner input = new Scanner(System.in);

    System.out.println("Welcome to the twistAround (made up language) translation program.\n");

    System.out.print("Enter word to translate: ");
    String word = input.nextLine();

    String secondHalf = word.substring(word.length() / 2, word.length());

    System.out.println(secondHalf);

Output: Welcome to the twistAround (made up language) translation program.

Enter word to translate: Helicopter opter BUILD SUCCESSFUL (total time: 4 seconds)

So far, I've got it to output opter. However, I'm not sure how I would capitalize the "o".

Answer 1

1 - one way to use charAt method and get the first character.

2 - change the case of character and add it to string.

    String secondHalf = "opter";
    char a = secondHalf.charAt(0);
    secondHalf = secondHalf.substring(1);
    secondHalf = Character.toString(a).toUpperCase()+secondHalf;
    System.out.println(secondHalf);

3 - one other way to use substring method and then remove first character. changer the case. then add it to string.

    String secondHalf = "opter";
    String a = secondHalf.substring(0, 1);
    secondHalf = secondHalf.substring(1);
    secondHalf = a.toUpperCase()+secondHalf;
    System.out.println(secondHalf);

Answer 2

the use of a StringBuilder prevents the unnecessary generation of strings

String secondHalf = "opter";
StringBuilder buf = new StringBuilder( secondHalf );
buf.setCharAt( 0, Character.toUpperCase( buf.charAt( 0 ) ) );
buf.toString();  // "Opter"

secondHalf may not be empty
otherwise a java.lang.StringIndexOutOfBoundsException is thrown