string to string array conversion in java

There are several ways to convert a string to a string array in Java. Here are a few options:

1. Using the split() method of the String class:

String input = "Hello, World!";
String[] words = input.split(" ");

This will split the input string on the space character and return an array of strings, where each element is a word from the input string.

2. Using the toCharArray() method of the String class:

String input = "Hello, World!";
char[] chars = input.toCharArray();
String[] words = new String[chars.length];
for (int i = 0; i < chars.length; i++) {
  words[i] = Character.toString(chars[i]);
}

This will convert the input string to an array of characters, and then create a new string array where each element is a character from the input string.

3. Using the Pattern and Matcher classes from the java.util.regex package:

String input = "Hello, World!";
Pattern pattern = Pattern.compile(" ");
Matcher matcher = pattern.matcher(input);
List<String> words = new ArrayList<>();
int i = 0;
while (matcher.find()) {
  words.add(input.substring(i, matcher.start()));
  i = matcher.end();
}
words.add(input.substring(i));
String[] wordsArray = words.toArray(new String[0]);

This will use a regular expression to split the input string on the space character and return a string array where each element is a word from the input string.