expecting null as output

[naveen yadav]

Why don't following code return null ? since there is no such key named "austin" it should return null.

import java.util.*;
class CeilingFloor
{

public static void main(String[] args) throws Exception {

NavigableMap<String,Integer> navmp=new TreeMap<String,Integer>();

          navmp.put("three",3);
          navmp.put("four",4);
          navmp.put("five",5);
          navmp.put("six",6);

		
		  System.out.println(navmp.ceilingKey("austin")); 
		  
}

}

Output :five ???


Regards
naveen

[Mohamed Sanaulla]

So according to the documentation:

Returns the least key greater than or equal to the given key, or null if there is no such key.

The ordering for strings would be the natural ordering, hence the string least greater than "austin" would be "five"

[naveen yadav]

thanks Mohamed Sanaulla.

so in which case it may return null ?



naveen

[Paul Clapham]

naveen yadav wrote:so in which case it may return null ?

That was specifically answered in the documentation which Mohamed posted.

[naveen yadav]

i got it now .

it will return null when

  System.out.println(navmp.ceilingKey("z"));

Thanks Mohamed Sanaulla and Paul Clapham.