This is an example of how to get a TreeSet size, that is the number of elements that a TreeSet contains. Getting the TreeSet size implies that you should:
- Create a new TreeSet.
- Populate the set with elements, with
add(E e)API method of TreeSet. - Invoke
size()API method of TreeSet, to get the number of elements in the set. - To check if the size changes with an element’s removal, we can remove an element from the set, with
remove(Object o)API method of TreeSet and then check its size again.
Let’s take a look at the code snippet that follows:
package com.javacodegeeks.snippets.core;
import java.util.TreeSet;
public class TreeSetSizeExample {
public static void main(String[] args) {
// Create a TreeSet and populate it with elements
TreeSet treeSet = new TreeSet();
treeSet.add("element_1");
treeSet.add("element_2");
treeSet.add("element_3");
// int size() method returns the number of elements in the TreeSet
System.out.println("Size of TreeSet : " + treeSet.size());
// Remove one element from the TreeSet using remove method
treeSet.remove("element_2");
System.out.println("Size of TreeSet : " + treeSet.size());
}
}
Output:
Size of TreeSet : 3
Size of TreeSet : 2
This was an example of how to get a TreeSet size in Java.
