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/* Get Size of Java TreeMap Example This Java Example shows how to get the size or nubmer of key value pairs stored in TreeMap using size method. */ import java.util.TreeMap; public class GetSizeOfTreeMapExample{ public static void main(String[] args) { //create TreeMap object TreeMap treeMap = new TreeMap(); /* To get the size of TreeMap use int size() method of TreeMap class. It returns the number of key value pairs stored in TreeMap object. */ System.out.println("Size of TreeMap : " + treeMap.size()); //add key value pairs to TreeMap using put method treeMap.put("1","One"); treeMap.put("2","Two"); treeMap.put("3","Three"); System.out.println("Size of TreeMap after addition : " + treeMap.size()); //remove one element from TreeMap using remove method Object obj = treeMap.remove("2"); System.out.println("Size of TreeMap after removal : " + treeMap.size()); } } /* Output would be Size of TreeMap : 0 Size of TreeMap after addition : 3 Size of TreeMap after removal : 2 */ |
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