Question

How to get the size of TreeSet on Java

Answer 1

package javaapplication1;

import java.util.TreeSet;

public class JavaApplication1 {

    public static void main(String[] args) {

        TreeSet treeSet = new TreeSet();
        
        System.out.println(treeSet.size());
        
        treeSet.add("Java");
        treeSet.add("C");
        treeSet.add("C++");
        treeSet.add("C#");
        treeSet.add("PHP");
        treeSet.add("JavaScript");
        treeSet.add("Python");
   
        System.out.println(treeSet.size());
    }
}
 
/*

run:

0
7

*/

 

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