this Keyword with Constructor in java, overloaded constructor in the same Class

Java Programming Language Class, Object and Methods in java (Article) Class, Object and Methods in java (Program)

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Program:

class Classthis{

 Classthis() {
 this(":Send hello:");
 System.out.println("Inside Constructor without parameter");
 }

 Classthis(String str) {
 System.out.println("Inside Constructor with String parameter as " + str);
 }

 public static void main(String[] args) {
 Classthis obj = new Classthis();
 }
}

/*
“this” keyword can be used inside the constructor to
call another overloaded constructor in the same Class.
This is called the Explicit Constructor Invocation.
This occurs if a Class has two overloaded constructors,
one without argument and another with argument. Then the “this”
keyword can be used to call constructor with argument from the
constructor without argument. This is required as the constructor
can not be called explicitly.*/

Output:

Inside Constructor with String parameter as :Send hello:
Inside Constructor without parameter
Press any key to continue . . .

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