Cannot reference “X” before supertype constructor has been called, where x is a final variable

The reason why the code would not initially compile is because defaultValue is an instance variable of the class Test, meaning that when an object of type Test is created, a unique instance of defaultValue is also created and attached to that particular object. Because of this, it is not possible to reference defaultValue in …

Read more

What destructors are run when the constructor throws an exception?

if a constructor throws an exception, what destructors are run? Destructors of all the objects completely created in that scope. Does it make any difference if the exception is during the initialization list or the body? All completed objects will be destructed. If constructor was never completely called object was never constructed and hence cannot …

Read more

Java: accessing private constructor with type parameters

Make sure you use getDeclaredConstructors when getting the constructor and set its accessibility to true since its private. Something like this should work. Constructor<Foo> constructor= (Constructor<Foo>) Foo.class.getDeclaredConstructors()[0]; constructor.setAccessible(true); Foo obj = constructor.newInstance(“foo”); System.out.println(obj); Update If you want to make use of getDeclaredConstructor, pass Object.class as an argument which translates to a generic T. Class fooClazz …

Read more

Has the new C++11 member initialization feature at declaration made initialization lists obsolete?

No, they are not obsolete as this article Get to Know the New C++11 Initialization Forms says in the Class Member Initialization section (emphasis mine): Bear in mind that if the same data member has both a class member initializer and a mem-init in the constructor, the latter takes precedence. In fact, you can take …

Read more