Check if a particular key exists in Java TreeMap example
- /*
- Check if a particular key exists in Java TreeMap example
- This Java Example shows how to check if TreeMap object contains a particular
- key using containsKey method of TreeMap class.
- */
- import java.util.TreeMap;
- public class CheckKeyOfTreeMapExample {
- public static void main(String[] args) {
- //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");
- /*
- To check whether a particular key exists in TreeMap use
- boolean containsKey(Object key) method of TreeMap class.
- It returns true if the TreeMap contains mapping for specified key
- otherwise false.
- */
- boolean blnExists = treeMap.containsKey("1");
- System.out.println("1 exists in TreeMap ? : " + blnExists);
- }
- }
- /*
- Output would be
- 1 exists in TreeMap ? : true
- */
