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What is Dependency Injection and Inversion of Control in Spring Framework?
...l(IoC) Container:
This is common characteristic of frameworks, IoC manages java objects - from instantiation to destruction through its BeanFactory. - Java components that are instantiated by the IoC container are called beans, and the IoC container manages a bean's scope, lifecycle events, ...
Understand the “Decorator Pattern” with a real world example
..., or the Decorator pattern. Due to the nature of dynamic languages such as Javascript, this pattern becomes part of the language itself.
// Person object that we will be decorating with logging capability
var person = {
name: "Foo",
city: "Bar"
};
// Function that serves as a decorat...
Are static class variables possible in Python?
...t;> MyClass.i, m.i
>>> (3, 4)
This is different from C++ and Java, but not so different from C#, where a static member can't be accessed using a reference to an instance.
See what the Python tutorial has to say on the subject of classes and class objects.
@Steve Johnson has already a...
What's the difference between ASCII and Unicode?
...osoft and Apple operating systems for example. And language runtimes like Java. The v2 spec came up with a way to map those 1.1 million code points into 16-bits. An encoding called UTF-16, a variable length encoding where one code point can take either 2 or 4 bytes. The original v1 code points t...
Why does Clojure have “keywords” in addition to “symbols”?
...m all the time).
The easiest way to see the difference is to read Keyword.java and Symbol.java in the Clojure source. There are a few obvious implementation differences. For example a Symbol in Clojure can have metadata and a Keyword can't.
In addition to single-colon syntax, you can use a doubl...
Is it possible to use raw SQL within a Spring Repository
...odel for various reasons.
Suppose your entity is like this :
import javax.persistence.*;
import java.math.BigDecimal;
@Entity
@Table(name = "USER_INFO_TEST")
public class UserInfoTest {
private int id;
private String name;
private String rollNo;
...
Difference between a virtual function and a pure virtual function [duplicate]
... function implicitly makes the class it is defined for abstract (unlike in Java where you have a keyword to explicitly declare the class abstract). Abstract classes cannot be instantiated. Derived classes need to override/implement all inherited pure virtual functions. If they do not, they too will ...
Unrecognized SSL message, plaintext connection? Exception
I have a java complied package to speak with the https server on net. Running the compilation gives the following exception:
...
Why doesn't Objective-C support private methods?
...
Thank you. Python, Java and Objective-C all have runtime object models that are pretty darned similar [to SmallTalk]. Java was quite directly derived from Objective-C. Python ran a parallel course more than one of inspiration, but Guido certai...
Is there a unique Android device ID?
...vices have a unique ID, and if so, what is a simple way to access it using Java?
52 Answers
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