do you need to import to use split() in java code example

Example 1: split method in java

public class SplitExample2 { 
    public static void main(String args[]) 
    { 
        String str = "My name is Chaitanya";
        //regular expression is a whitespace here 
        String[] arr = str.split(" "); 
  
        for (String s : arr) 
            System.out.println(s); 
    } 
}

Example 2: split on . in java

String textfile = "ReadMe.txt";
String filename = textfile.split(".")[0];
String extension = textfile.split(".")[1];