Strings

        StringBuilder sb = new StringBuilder();

        String randomWord = "Hello world!";
        for (int i = 0; i < randomWord.length(); i++) {
            System.out.println("Character " + i + " is:" + randomWord.charAt(i));
        }

        char space = ' ';
        int i = 0;
        String newWord = "";

        while (randomWord.charAt(i) != space && i != randomWord.length() - 1) {
            newWord += "" + randomWord.charAt(i);
            sb.append(randomWord.charAt(i)); // "StringBuilder" ползва по-малко памет
            i++;
        }

        System.out.println(newWord);
        System.out.println(sb.toString());