Java Collection Tutorial - Java TreeMap.ceilingKey(K key)

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Syntax

TreeMap.ceilingKey(K key) has the following syntax.

public K ceilingKey(K key)

Example

In the following code shows how to use TreeMap.ceilingKey(K key) method.

/*  www. j a v  a  2 s . c o  m*/

import java.util.NavigableMap;
import java.util.TreeMap;

public class Main {
   public static void main(String[] args) {
      
      NavigableMap<Integer, String>  treemap = new TreeMap<Integer, String> ();
      
      // populating tree map
      treemap.put(2, "two");
      treemap.put(1, "one");
      treemap.put(3, "three");
      treemap.put(6, "six");
      treemap.put(5, "from java2s.com");
      
      System.out.println("Ceiling key entry for 4: "+ treemap.ceilingKey(4));
      System.out.println("Ceiling key entry for 5: "+ treemap.ceilingKey(5));
      System.out.println("Ceiling key entry for 7: "+ treemap.ceilingKey(7));
   }    
}

The code above generates the following result.

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