(Java)How to make an if statement to check for if a String is greater than 10 characters

So far I have been able to figure out how many characters are in the string, I can't seem to figure out an if statement to check if the character has more than 10 characters and if it does only display the first 10.

import java.text.*

public class StringPracticeCoding

{
 public static void main (String[] args)

   {
      //local constants

  //local variables

  //phrase input by the user
  String sentence = "I am somebody, I am worthy";


  /********************   Start main method  *****************/

  System.out.println("Length of String: " + sentence.length());

      System.out.println(sentence.substring(0,10));

yes it has to be an if statement