There won’t be any difference in execution of those methods but in case of new A().doThis() your’re going to lose the reference to the instance of an object you’ve invoked the method on and you won’t be able to use it further in your code. All the changes this method could’ve done to internal state … Read more
How to see the real benefits of the approach described in the book? The purpose of separate instance is not for any benefit but to maintain the contract that each test should be independently executed without any effect of the execution of a previous test. There is just no other way to ensure this contract … Read more
No, only use this when you have a name conflict such as when a method parameter has the same name as an instance field that it is setting. It can be used at other times, but many of us feel that it simply adds unnecessary verbiage to the code.
One way to bypass the restriction is to use reflections: import java.lang.reflect.Constructor; public class Example { public static void main(final String[] args) throws Exception { Constructor<Foo> constructor = Foo.class.getDeclaredConstructor(); constructor.setAccessible(true); Foo foo = constructor.newInstance(); System.out.println(foo); } } class Foo { private Foo() { // private! } @Override public String toString() { return “I’m a Foo … Read more
You’re trying to use the non-static inner positionObj class without an instance of Secretary for it to belong to. A non-static inner class must belong to an instance of its parent class You should probably change positionObj to a normal class or a static inner class. Alternatively, you can write someSecretary.new positionObj() to create an … Read more
isinstance() is your friend here. It returns a boolean and can be used in the following ways to check types. if isinstance(obj, (int, long, float, complex)): print obj, “is a built-in number type” if isinstance(obj, MyClass): print obj, “is of type MyClass”
This was an incredibly strange issue, but since there it has been solved, it might as well get an answer. I think it’s a bug in the .suo files, as my VS was behaving oddly lately, my programs suddenly started crashing, not building and saying the Office references were not valid. One fix I tried … Read more
When the memory for the atribute 1 & 2 are allocated in the heap ? The memory for the object as a whole is allocated when the new operator is invoked, before the java.lang.Object constructor is entered. Memory is allocated for individual Integer instances in init, but there is no point when memory is allocated … Read more
You should implement the IEquatable<T> interface on your class, which will allow you to define your equality-logic. Actually, you should override the Equals method as well. public class TestData : IEquatable<TestData> { public string Name {get;set;} public string type {get;set;} public List<string> Members = new List<string>(); public void AddMembers(string[] members) { Members.AddRange(members); } // Overriding … Read more
Do you just want to call a parameterless constructor to create the instance? Is the type specified as a string as well, or can you make it a generic method? For example: // All error checking omitted. In particular, check the results // of Type.GetType, and make sure you call it with a fully qualified … Read more