import java.util.Arrays;
import java.util.regex.Pattern;
 
class Ideone
{
    public static void main(String[] args) {
        String str = "ABC";
 
        // String#split() を試してみる
        String[] elems = str.split("");
        System.out.println(Arrays.toString(elems));
 
        Pattern delimiter = Pattern.compile("");
 
        // Pattern#split() を試してみる
        elems = delimiter.split(str);
        System.out.println(Arrays.toString(elems));
    }
}

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