The function of the This keyword-Displays the call constructor.

Calling constructors from constructors

Sited By<think in java> p118
When you write several constructors for a class, there is times when you're

Constructor from another to avoid duplicating code.

When you write several constructors for a class, sometimes you need to call another constructor in a constructor to avoid repeating the code.
You can make such a call by using the This keyword.

At this point you can do this by calling the This keyword.
Normally, when you say this , it's in the sense of ' this object ' or ' The current object, ' and by
itself it produces the reference to the current object.

< Span style= "FONT-SIZE:11PT;" >

In a constructor, the this keyword takes on a different meaning when you give it an argument list .

But inside the constructor, when you give it some formal parameters, the This keyword can represent a different meaning.

< Span style= "FONT-SIZE:11PT;" >it makes an explicit call to The constructor this matches that argument list. < /span>

< Span style= "FONT-SIZE:11PT;" > that's you. It can be displayed by invoking a constructor that is the same as the number of its formal parameters.

Thus you have a straightforward-to-call other constructors.

So you can easily invoke other construction methods.

: initialization/flower.java// calling constructors with  "This" import static  net.mindview.util.print.*;p ublic class flower {int petalcount = 0; string s =  "Initial value"; Flower (int petals)  {petalcount = petals;print ("constructor w/ int arg  only, petalcount=  "+ petalcount);} Flower (STRING SS)  {print ("constructor w/ string arg only, s = "  + SS); s = ss;} Flower (string s, int petals)  {this (petals);//! this (s);  // can ' T call  two!this.s = s; // Another use of  "This" print ("string &  int args ");} Flower ()  {this ("Hi",  47);p rint ("default constructor  (No args)");} Void printpetalcount ()  {//! this (one);  // not inside non-constructor!print (" Petalcount =  " + petalCount + "  s =  "+ s);} Public static void main (String[] args)  {flower x = new flower (); X.printpetalcount ();}}  /* Output:Constructor w/ int arg only, petalCount= 47String  & int argsdefault constructor  (No args) petalcount = 47 s =  hi*///:

The function of the This keyword-Displays the call constructor.