Java TreeSet first() method

The first() method of TreeSet class is used to find smallest element of the set.

Syntax:

Return:

Returns smallest element of the set

Example 1

import java.util.*;
public class JavaTreeSetFirstExample1
{
  public static void main(String as[]){
  TreeSet <Integer>obj = new TreeSet<Integer>();
  obj.add(5);	
  obj.add(3);
  obj.add(7);
  obj.add(2);
  obj.add(10);
  System.out.println("TreeSet: " +obj);
  System.out.println("Smallest element in TreeSet: " +obj.first());
  }
}

Output:

TreeSet: [ 2, 3, 5, 7, 10 ]
Smallest element in TreeSet: 2

Example 2

import java.util.*;
public class JavaTreeSetFirstExample2
{
  public static void main(String as[]){
  TreeSet <String> obj = new TreeSet<String>();
  obj.add("D");	
  obj.add("g");
  obj.add("q");
  obj.add("P");
  System.out.println("TreeSet: " +obj);
  System.out.println("Smallest element in TreeSet: " +obj.first());
  }
}

Output:

TreeSet: [ D, P, g, q ]
Smallest element in TreeSet: D

Example 3

import java.util.*;
public class JavaTreeSetFirstExample3
{
  public static void main(String as[]){
  TreeSet <String> obj = new TreeSet<String>();
  obj.add("c");	
  obj.add("V");
  obj.add("K");
  obj.add("M");
  obj.add("5");
  obj.add("3");
  obj.add("1");
  obj.add("2");
  System.out.println("TreeSet: " +obj);
  System.out.println("Smallest element in TreeSet: " +obj.first());
  }
}

Output:

TreeSet: [ 1, 2, 3, 5, K, M, V, c ]
Largest element in TreeSet: 1

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Java TreeSet first() method

Syntax:

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Example 1

Example 2

Example 3

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Java TreeSet first() method

Syntax:

Return:

Example 1

Example 2

Example 3

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