As I understand. You don’t call any Derived properties (myVar belongs to Base, not to Derived). And java is not running static block from Derived. If you add some static field to Derived and access it, then java executes all static blocks. class Base { static public int myVar; } class Derived extends Base { … Read more
You can have static blocks in C++ as well – outside classes. It turns out we can implement a Java-style static block, albeit outside of a class rather than inside it, i.e. at translation unit scope. The implementation is a bit ugly under the hood, but when used it’s quite elegant! Downloadable version There’s now … Read more
They’re for two very different purposes: The static initializer block will be called on loading of the class, and will have no access to instance variables or methods. As per @Prahalad Deshpande’s comment, it is often used to create static variables. The non-static initializer block on the other hand is created on object construction only, … Read more
Yes, you are right. Static initialization blocks are run when the JVM (class loader – to be specific) loads StaticClass (which occurs the first time it is referenced in code). You could force this method to be invoked by explicitly calling StaticClass.init() which is preferable to relying on the JVM. You could also try using … Read more
I learn visually, so here’s a visual representation of order, as a SSCCE: public class Example { static { step(1); } public static int step_2 = step(2); public int step_8 = step(8); public Example(int unused) { super(); step(10); } { step(9); } // Just for demonstration purposes: public static int step(int step) { System.out.println(“Step ” … Read more
The non-static block: { // Do Something… } Gets called every time an instance of the class is constructed. The static block only gets called once, when the class itself is initialized, no matter how many objects of that type you create. Example: public class Test { static{ System.out.println(“Static”); } { System.out.println(“Non-static block”); } public … Read more