java.lang.Boolean more than two Instances -


i have noticed weird behaviour in code of hibersap project (booleanconverter linenumber 75).

the problem boolean value not converted 'x'. have debugged code , inspected boolean expression javavalue == boolean.true. expression interpreted false because javavalue boolean.true , has id 36 , boolean.true has id 33 (the id shown in variables-view of eclipse ide). can inspect instances of boolean , indeed, there 4 instances of java.lang.boolean!!

could please explain me why happening.

edit:

okay, think question isn't precise enough. field should converted boolean , not java.lang.boolean. must classloader fault here. in case conversion boolean boolean done jvm. know every object comparison should use .equals() (and fill in bug) in case should work is. see following code:

public static void main(string[] args) {     for(int = 0; < 1000; i++){         print(true);     }  }  public static void print(object value) {     system.out.println(value); }

this should not create 1000 java.lang.boolean instances. should always use java.lang.boolean.true! , strange behaviour of code couldn't understand.

maybe side effect of reflection done hibersap? think should not reason such behaviour.

please, want understand.

each time you're doing new boolean(true) or new boolean(false), create new instance of boolean, is, definition, different other instances. objects, except enums, should never compared ==. use .equals() instead. or, in case, use javavalue.booleanvalue().


Comments

Post a Comment

Popular posts from this blog

monitor web browser programmatically in Android? -

i've got tricky question here. need users make payment bank (namely barclaycard) in uk. so, have https url , add parameters (such amount pay, order reference, etc) url, start http connection intent.actionview, redirect user browser can enter credit card details on bank's webpage , make payment our account successfully. far ? the code use below (i changed values privacy reasons) problem is, need app when user has completed/failed/cancelled payment. barclaycardautomatically redirects particular url when payment has succeeded, 1 if failed. there no way of knowing when barclaycard payment has succeeded go android app somehow ? button cardbutton = (button) findviewbyid(r.id.card_button); cardbutton.setonclicklistener(new view.onclicklistener() { @override public void onclick(view arg0) { string prehashstring = new string(); string prohashstring = new string(); string shapassphrase = new string(); shapassphrase = "gsvth£h70zkh...
Read more

Shrink a YouTube video to responsive width -

i have youtube video embedded on our website , when shrink screen tablet or phone sizes stops shrinking @ around 560px in width. standard youtube videos or there can add code make go smaller? you can make youtube videos responsive css. wrap iframe in div class of "videowrapper" , apply following styles: .videowrapper { float: none; clear: both; width: 100%; position: relative; padding-bottom: 56.25%; padding-top: 25px; height: 0; } .videowrapper iframe { position: absolute; top: 0; left: 0; width: 100%; height: 100%; } the .videowrapper div should inside responsive element. padding on .videowrapper necessary keep video collapsing. may have tweak numbers depending upon layout.
Read more

wpf - PdfWriter.GetInstance throws System.NullReferenceException -

i'm trying create pdf document using itextsharp 5.3.4 using following document document = new document(); filestream stm = new filestream(filename, filemode.create); pdfwriter writer = pdfwriter.getinstance(document, stm); i'm getting system.nullreferenceexception following stack trace: system.nullreferenceexception occurred hresult=-2147467261 message=la référence d'objet n'est pas définie à une instance d'un objet. source=itextsharp stacktrace: à itextsharp.text.version.getinstance() innerexception: i've verified neither document nor stm null, , if select "continue" in vs12 document created - exception thrown. updated itextsharp 5.4.0 , it's still occurring. can't find information on anywhere - got ideas? make sure not catching exceptions. nullreferenceexception can 1 caught , handled inside itextsharp, don't care it. fact can continue supports theory. change following setting verify: debug -> exceptions ...
Read more