does each class has separate constructor in java code example

Example 1: java constructor

class MyClass {
  public MyClass () {
    //constructor code
  }
}

Example 2: constructor in java

A constructor is a special method
used to initialize objects in java.
we use constructors to initialize
all variables in the class 
when an object is created.
  As and when an object
is created it is initialized
automatically with the help of 
constructor in java.
  
We have two types of constructors:
Default Constructor
Parameterized Constructor

I use Constructor in pages classes in my framework
public classname(){
}
public classname(parameters list){
}