string manipulation- middle 3 letters

After prompting for a string, I am trying to display the middle three characters of that string. How would I do that?

this is开发者_运维百科 what I tried:

String middle3 = (string.length < 3) ? null : string.substring(string.length / 2 - 1), string.length / 2 + 2);

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length is a method of the String class, so you need to use ():

String middle3 = (string.length() < 3) ? null : 
              string.substring(string.length() / 2 - 1, string.length() / 2 + 2);

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This will work for any string that is odd, length > 3

String word = "Hello";
int midCharsStart = ((word.length() + 1) / 2) - 2;
int midCharsEnd = midCharsStart + 3;
System.out.println(word.substring(midCharsStart, midCharsEnd));