what do you understand by constructor & how it is different from methods in java. code example

Example 1: how to create a constructor in java

class Other{
    public Other(String message){
        System.out.println(message);
    }
}

class scratch{
    public static void main(String[] args) {
        Other method = new Other("Hey");
        //prints Hey to the console
    }
}

Example 2: calling this in constructor java

In Java another constructor of the same class can be called from a
  constructor via this().
 Note however that this has to be on the first line.