Get first value in Java TreeSet



To get the first value in TreeSet, use the first() method.

First, get the TreeSet and add elements to it

TreeSet<String> tSet = new TreeSet<String>();
tSet.add("10");
tSet.add("20");
tSet.add("30");
tSet.add("40");
tSet.add("50");
tSet.add("60");

Now, get the first value

tSet.first()

The following is an example to get the first value in TreeSet

Example

 Live Demo

import java.util.*;
public class Demo {
   public static void main(String args[]){
      TreeSet<String> tSet = new TreeSet<String>();
      tSet.add("10");
      tSet.add("20");
      tSet.add("30");
      tSet.add("40");
      tSet.add("50");
      tSet.add("60");
      System.out.println("TreeSet elements...");
      Iterator i = tSet.iterator();
      while(i.hasNext()){
         System.out.println(i.next());
      }
      System.out.println("First Value = " + tSet.first());
   }
}

Output

The output is as follows

TreeSet elements...
10
20
30
40
50
60
First Value = 10

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