I am required to write up a static method named getSuccessiveLetters(words) that takes a string array and returns a single String. If the String array is {"hello", "world"}, then the program should return "ho". "h" is from the first word, "o" is the 2nd letter from the 2nd word and so on.
I managed to get the correct return value for {"hello", "world"}, but if the String array contains, for example,{"1st", "2nd", "3rd", "4th", "fifth"} it goes out of range it struggles.
public class Template01 {
public static void main(String[] args) {
System.out.println(getSuccessiveLetters(new String[]{"1st", "2nd", "3rd", "4th", "fifth"}));
}
public static String getSuccessiveLetters(String[] words) {
char Str[] = new char[words.length];
String successive;
for(int i = 0; i < words.length; i++){
successive = words[i];
if (i < successive.length()){
Str[i] = successive.charAt(i);
}
else
{
break;
}
}
successive = new String(Str);
return successive;
}
I expected the return value to be 1nd, but the actual output is 1nd\x00\x00.
This is happening because when you initialize a char array, it fills the array with the default char value.
You can use StringBuilder or List<Character> to grow your "array" with each addition.
Change
char[] str = new char[words.length];
to
StringBuilder str = new StringBuilder();
and
str[i] = successive.charAt(i);
to
str.append(successive.charAt(i));
and then at the end successive = str.toString();.