java - @Test is calling Parent class constructor in TestNG Selenium -


i newbie java , please have @ below code 

//parent class  public class abc {     abc(){system.out.println("hiii");     } }  //child class  public class cde extends abc{     @test     public void xyz(){         system.out.println("hi");     }     }     output coming  hiii hi passed: xyz

please , not sure why constructor of parent class getting called when not using new keyword create object.i have created 2 different classes in eclipse.same not happening if creating main method in child class ie not using testng @test annotation.

when use @test annotation testng, here's testng does, behind scenes.

  • it first loads class.
  • it makes list of testng annotated methods run (for e.g., @test, @beforeclass etc.,) , orders them in testng way (i.e., @beforesuite, @beforetest, @beforeclass, @test , on)
  • it finds default constructor in class. if no default constructor found, tries 1 argument constructor takes string.
  • using reflection class instantiated.
  • now using instance of test class obtained via reflection, testng starts calling various annotated methods in pre-defined order.

the reason why base class constructor being invoked, due testng instantiating child class via reflection, triggers constructor chain inheritance ladder (which called constructor chaining)

you can test theory adding constructor child class cde , adding system.out.println. see print statement being executed.

when via main() method, there's no reflection involved, because testng not involved.


Comments

Post a Comment

Popular posts from this blog

What is happening when Matlab is starting a "parallel pool"? -

running parallel cpu processes in matlab starts command parpool() according documentation , function: [creates] special job on pool of workers, , [connects] matlab client parallel pool. this function takes bit of time execute, on order of 30 seconds. in other multi-cpu paradigms openmp, parallel execution seems totally transparent -- i've never noticed behavior analogous matlab (granted i'm not experienced parallel programming). so, happening between time parpool() called , when finishes executing? takes long? parallel computing toolbox enables run matlab code in parallel using several different paradigms (e.g. jobs , tasks, parfor , spmd , parfeval , batch processing), , run either locally (parallelised across cores in local machine) or remotely (parallelised across machines in cluster - either 1 own, or 1 in cloud). in of these cases, code run on matlab workers , copies of matlab without interactive desktop. if you're intending run on remo...
Read more

angular - DownloadURL return null in below code -

when change file updated in firebase storage when try downloadurl show null. filechange(event: any) { const imagefolder: string = this.employee.id; const filelist: filelist = event.target.files; const file: file = filelist[0]; const storageref = firebase.storage().ref().child(`${imagefolder}/profile.jpg`).put(file); console.log(storageref.snapshot.downloadurl); } the put() asynchronous. if want url after file uploaded have this: firebase.storage().ref().child(`${imagefolder}/profile.jpg`).put(file).then((snapshot) => { storageref = snapshot.downloadurl: console.log(snapshot.downloadurl); });
Read more

php - Cannot override Laravel Spark authentication with own implementation -

during login process of laravel spark need request token of remote api. api stores exact same users , passwords laravel spark application. therefore need username , non hashed password of user during authentication process. i thought overriding authenticated method solution problem. in routes/web.php override post /login endpoint , pointing endpoint own logincontroller: <?php namespace app\http\controllers\auth; use illuminate\support\facades\log; use illuminate\http\request; use laravel\spark\http\controllers\auth\logincontroller sparklogincontroller; class logincontroller extends sparklogincontroller { /** * create new login controller instance. * * @return void */ public function __construct() { parent::__construct(); } /** * handle successful authentication attempt. * * @param request $request * @param \illuminate\contracts\auth\authenticatable $user * @return response */ public fu...
Read more