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  • How to use @Nullable and @Nonnull annotations more effectively?
    Since these annotations are not well enforced there is a danger of assuming a value marked with @Nonnull is not null and consequently not performing null checks The code below causes a parameter marked with @Nonnull to be null without raising any complaints It throws a NullPointerException when it is run
  • Is there any difference between @empty and @null?
    Sure, but there would be no point in calling setBackground(null) at all, unless the superclass is setting a default upon null, which most don't I was just describing how it would end up being handled in the View class in particular, and the setBackground(null) call there is actually pointless because View 's background is already null by
  • android meaning of @null in xml attribute - Stack Overflow
    However, explicitly setting background to "@null" removes the background, causing whatever is below the element to be shown In particular, if you for instance set the background of a Button to null, the border of the button will also be gone (and the button effectively will not really look like a button at all)
  • contentDescription=@null a bad idea? - Stack Overflow
    If you try to set @null on something clickable, the device will speak "Button" instead Changing the description to "Green Button" doesn't help Don't make your users guess at what "Green Button" is! If you're ever unsure, don't forget you can enable TalkBack on your phone It's pre-installed on most devices or you can get it from the Play store
  • android - What is `@null` compiled to? - Stack Overflow
    So if we give a button background android:background="@null" we are giving null to our java Button class file which will draw nothing on button background So it works just like java null passing to some method or property and will compile to null reference same as java And a null is represented by a 0 in bytecode after compilation
  • android - Set Background as null - Stack Overflow
    android:background="@null" is absolutely safe If you want to set the background based on your logic in code, you can definitely use this; and if you do not set the background in code, it is still the same and will never cause any problems
  • Can I set null as the default value for a @Value in Spring?
    Now you can use the string @null to represent the null value @Value("${stuff value:@null}") private String value; Please note: The context name space doesn't support the null value at the moment You can't use <context:property-placeholder null-value="@null" > Tested with Spring 3 1 1
  • android - is there any diff @null Vs #00000000 - Stack Overflow
    @null means no background at all (View getBackground() returns null) #00000000 means that you got a ColorDrawable as the background which has a fully-transparent color I didn't look at the code, but I guess that the framework tests if the ColorDrawable is fully transparent and does not draw it in this case
  • java - @Nullable annotation usage - Stack Overflow
    It makes it clear that the method accepts null values, and that if you override the method, you should also accept null values It also serves as a hint for code analyzers like FindBugs For example, if such a method dereferences its argument without checking for null first, FindBugs will emit a warning
  • What is point of constraint validation @Null? - Stack Overflow
    public class MyClass{ @NotNull private String myString1; @Null private String myString2; getter setters } @NotNull completely makes sense I do not expect myString1 to be null but @Null makes myString2 useless What is point of having a field which should always be null





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