how to check if TreeMap object contains a particular key using containsKey method of TreeMap class - Java Collection Framework

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Description

how to check if TreeMap object contains a particular key using containsKey method of TreeMap class

Demo Code


 
import java.util.TreeMap;
 
public class Main {
 
  public static void main(String[] args) {
   // ww  w.j  av a 2s .c  o  m
    //create TreeMap object
    TreeMap treeMap = new TreeMap();
   
    //add key value pairs to TreeMap
    treeMap.put("1","One");
    treeMap.put("2","Two");
    treeMap.put("3","Three");
   
    boolean blnExists = treeMap.containsKey("1");
    System.out.println("1 exists in TreeMap ? : " + blnExists);
  }
}

Result


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