how to call contstracter of the class in java code example

Example 1: java constructor

class Huso {
  public Huso() {
  	//constructor code about a huso
  }
}

Example 2: constructor in java

public class ConstructorDemo
{
   int a;
   ConstructorDemo()
   {
      a = 26;
   }
   public static void main(String[] args)
   {
      ConstructorDemo obj = new ConstructorDemo();
      System.out.println(obj.a);
   }
}