Check out example codes for "TreeMap containsKey() method in java". It will help you in understanding the concepts better.

Code Example 1

import java.util.TreeMap;
public class TreeMapContainsKeyMethodExample
{
   public static void main(String[] args)
   {
      TreeMap<Integer, String> tm = new TreeMap<Integer, String>();
      // map String values to Integer keys
      tm.put(56, "orange");
      tm.put(62, "indigo");
      tm.put(43, "red");
      tm.put(91, "green");
      tm.put(38, "yellow");
      System.out.println("TreeMap before using containsKey() method: " + tm);
      // check for key element '62'
      System.out.println("Does key '62' present? " + tm.containsKey(62));
      // check for key element '90'
      System.out.println("Does key '90' present? " + tm.containsKey(90));
   }
}

Code Example 2

map Integer values to String Keys
import java.util.TreeMap;
public class TreeMapContainsKeyMethodExample
{
   public static void main(String[] args)
   {
      TreeMap<String, Integer> tm = new TreeMap<String, Integer>();
      // Mapping Integer values to string keys
      tm.put("violet", 18);
      tm.put("red", 12);
      tm.put("violet", 14);
      tm.put("green", 16);
      tm.put("blue", 20);
      System.out.println("Given TreeMap Mappings are: " + tm);
      // check for key element 'green'
      System.out.println("Is key 'green' present? " + tm.containsKey("green"));
      // checking for key element 'yellow'
      System.out.println("Is key 'yellow' present? " + tm.containsKey("yellow"));
   }
}

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