What is coupling in Java?

What is Coupling in Java? Coupling is nothing but the dependency of one class on the other. If one object in a code uses the other object in the program, it is called loose coupling in Java. In coupling, two classes or objects collaborate and work with each other to complete a pre-defined task.

What is coupling in oops?

In object oriented design, Coupling refers to the degree of direct knowledge that one element has of another. In other words, how often do changes in class A force related changes in class B. There are two types of coupling: Tight coupling : In general, Tight coupling means the two classes often change together.

What is coupling and cohesion in Java?

Cohesion is an indication of how related and focused the responsibilities of an software element are. Coupling refers to how strongly a software element is connected to other elements. The software element could be class, package, component, subsystem or a system.

What is loose and tight coupling in Java?

Tight coupling means classes and objects are dependent on one another. In general, tight coupling is usually not good because it reduces the flexibility and re-usability of the code while Loose coupling means reducing the dependencies of a class that uses the different class directly.

How do you achieve loose coupling in Java?

Abstraction is the Key. To achieve loose coupling, one should use abstract classes or interface while performing inheritance. The following examples will make the concept clearer.

What is dependency in Java?

Dependency injection enables you to turn regular Java classes into managed objects and to inject them into any other managed object. Using dependency injection, your code can declare dependencies on any managed object.

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What is cohesion in Java?

Cohesion in Java is the Object-Oriented principle most closely associated with making sure that a class is designed with a single, well-focused purpose. In object-oriented design, cohesion refers to how a single class is designed. Note: The more focused a class is, the more is the cohesiveness of that class.

What is design pattern in Java?

Design patterns represent the best practices used by experienced object-oriented software developers. Design patterns are solutions to general problems that software developers faced during software development.

What makes a class cohesive?

cohesion refers all about how a single class is designed. Cohesion is the Object Oriented principle most closely associated with making sure that a class is designed with a single, well-focused purpose. The more focused a class is, the cohesiveness of that class is more.

What is cohesion in Javascript?

cohesion refers all about how a single class is designed. Cohesion is the Object Oriented principle most closely associated with making sure that a class is designed with a single, well-focused purpose. The more focused a class is, the cohesiveness of that class is more.

What is use of final keyword in Java?

The final keyword is a non-access modifier used for classes, attributes and methods, which makes them non-changeable (impossible to inherit or override). The final keyword is useful when you want a variable to always store the same value, like PI (3.14159…). The final keyword is called a “modifier”.

What is static keyword in Java?

In Java, static keyword is mainly used for memory management. It can be used with variables, methods, blocks and nested classes. It is a keyword which is used to share the same variable or method of a given class. Basically, static is used for a constant variable or a method that is same for every instance of a class.

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How does Java injection work?

Dependency injection enables you to turn regular Java classes into managed objects and to inject them into any other managed object. Using dependency injection, your code can declare dependencies on any managed object.

How do you create a single tone class in Java?

To create a singleton class, we must follow the steps, given below:
  1. Ensure that only one instance of the class exists.
  2. Provide global access to that instance by: Declaring all constructors of the class to be private. Providing a static method that returns a reference to the instance.

What is method overloading in Java?

In Java, two or more methods may have the same name if they differ in parameters (different number of parameters, different types of parameters, or both). These methods are called overloaded methods and this feature is called method overloading.

What is coupling in Java?

What is Coupling in Java? Coupling is nothing but the dependency of one class on the other. If one object in a code uses the other object in the program, it is called loose coupling in Java. In coupling, two classes or objects collaborate and work with each other to complete a pre-defined task.

How do you clear a variable in Java?

Set clear() method in Java with Examples

Set. clear() method is used to remove all the elements from a Set. Using the clear() method only clears all the element from the set and not deletes the set. In other words, we can say that the clear() method is used to only empty an existing Set.

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How do you make a class immutable in Java?

To create an immutable class in Java, you have to do the following steps.
  1. Declare the class as final so it can’t be extended.
  2. Make all fields private so that direct access is not allowed.
  3. Don’t provide setter methods for variables.
  4. Make all mutable fields final so that its value can be assigned only once.
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How do you make a class static?

We can declare a class static by using the static keyword. A class can be declared static only if it is a nested class. It does not require any reference of the outer class. The property of the static class is that it does not allows us to access the non-static members of the outer class.

How do you create a static variable?

If a variable is static , the variable is assigned memory once and all objects of the class access the same variable. A static variable can be created by adding the static keyword before the variable during declaration.

What is @inject in Android?

Dependency injection (DI) is a technique widely used in programming and well suited to Android development. By following the principles of DI, you lay the groundwork for good app architecture. Implementing dependency injection provides you with the following advantages: Reusability of code. Ease of refactoring.

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