TreeMap containsKey() method in java
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));
}
}