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

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Syntax

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

public K lowerKey(K key)

Example

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

import java.util.TreeMap;
// w w w .ja v  a  2 s. co m
public class Main {
   public static void main(String[] args) {
      
      TreeMap<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");
      
      // getting lower key  
      System.out.println("Checking lower key");
      System.out.println("Value is: "+ treemap.lowerKey(5));
   }    
}

The code above generates the following result.

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