1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 |
/* 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 */ |
Add Comment