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How do I check (at runtime) if one class is a subclass of another?
...of many things, particularly Django's models, much easier. "Python is not Java." Why must python programmers have such chips on their shoulders?
– Michael Bacon
Aug 17 '15 at 18:32
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Is Integer Immutable
... probably very stupid, but a lot of places claim that the Integer class in Java is immutable, yet the following code:
10 An...
Is quitting an application frowned upon?
... think of your application as a monolithic application. It is written in java which is being executed by a single JVM (Java Virtual Machine) process. System.exit() exits the JVM and completely and fully terminates all UI screens and everything. The exception to this is IF the programmer goes to th...
How to use if-else option in JSTL
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One can still use plain old java syntax. I know I'm gonna be hated for this, but el is in no way compulsory. It was meant to be more readable and enforce separation of logic and UI, but it's too often not more readable, and the rest is about discipline....
The ALTER TABLE statement conflicted with the FOREIGN KEY constraint
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I need to implement via java/spring/code to do that, not directly via SQL query, any ideia how to do this with the following code: @ManyToMany(fetch = FetchType.EAGER, cascade = CascadeType.DETACH) @JoinTable(name = "tbUsuariosTipoOcorrencia", joinC...
Set ImageView width and height programmatically?
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Caused by: java.lang.NullPointerException: Attempt to write to field 'int android.view.ViewGroup$LayoutParams.height' on a null object reference
– MD Khali
Sep 6 '18 at 12:09
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How to “inverse match” with regex?
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For Python/Java,
^(.(?!(some text)))*$
http://www.lisnichenko.com/articles/javapython-inverse-regex.html
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Prevent user from seeing previously visited secured page after logout
... browser back button or history. That's bad for user experience. There are JavaScript hacks, but they are not reliable and will also not work when the client has JS disabled.
Your concrete problem is that the requested page is been loaded from the browser cache instead of straight from the server....
Replace whitespaces with tabs in linux
...o do the opposite: convert tabs to two spaces: perl -p -i -e 's/\t/ /g' *.java
– TimP
Jul 6 '13 at 14:53
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How to split a comma-separated string?
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Do you test it ? because I've just wrote a program java and the string " string, with , space ".trim() return "string, with , space". Like javadoc says : returns a copy of the string, with leading and trailing whitespace omitted. You are wrong and @user872858 is ri...