What are strategies in java with examples

What are strategies in java with examples

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Java is an object-oriented programming language known for its platform independence and versatility. Here, we'll dive into some of the most effective strategies used in Java, along with examples:

Example:

// Bad implementation
public class Employee {
public void updateName(String name) {
this.name = name;
}
public void calculateSalary() {
// calculation logic
}
}
// Good implementation
public interface UpdateName {
void setName(String name);
}
public interface CalculateSalary {
int calculate();
}
public class Employee implements UpdateName, CalculateSalary {
private String name;
@Override
public void setName(String name) {
this.name = name;
}
@Override
public int calculate() {
// calculation logic
}
}

Example:

// Duplicate code
public class BankAccount {
public void debit(int amount) {
System.out.println("Debiting " + amount);
}
public void credit(int amount) {
System.out.println("Crediting " + amount);
}
}
// Improved implementation using DRY principle
public abstract class Transaction {
public abstract void processTransaction(int amount);
}
public class Debit extends Transaction {
@Override
public void processTransaction(int amount) {
System.out.println("Debiting " + amount);
}
}
public class Credit extends Transaction {
@Override
public void processTransaction(int amount) {
System.out.println("Crediting " + amount);
}
}

Example:

// Poor encapsulation
public class Person {
private String name;
public void setName(String name) {
this.name = name;
}
public String getName() {
return name;
}
}
// Improved encapsulation using access modifiers
public class Person {
private final String name; // Immutable
public Person(String name) {
this.name = name;
}
public String getName() {
return name;
}
}

Example:

// Simple implementation
public class Car {
private Engine engine;
public void startEngine() {
engine.start();
}
}
public class Truck extends Car {
// ...
}
// Composition example
public interface Engine {
void start();
}
public class GasolineEngine implements Engine {
@Override
public void start() {
System.out.println("Gasoline engine started");
}
}
public class ElectricEngine implements Engine {
@Override
public void start() {
System.out.println("Electric engine started");
}
}
public class Car {
private final Engine engine;
public Car(Engine engine) {
this.engine = engine;
}
public void startEngine() {
engine.start();
}
}

Example:

// Simple implementation
public abstract class Vehicle {
public abstract void drive();
}
public class Car extends Vehicle {
@Override
public void drive() {
System.out.println("Driving a car");
}
}
public class Truck extends Vehicle {
@Override
public void drive() {
System.out.println("Driving a truck");
}
}
// Factory method example
public interface VehicleFactory {
Vehicle createVehicle();
}
public class CarFactory implements VehicleFactory {
@Override
public Vehicle createVehicle() {
return new Car();
}
}
public class TruckFactory implements VehicleFactory {
@Override
public Vehicle createVehicle() {
return new Truck();
}
}

These strategies can help you write more maintainable, flexible, and scalable code in Java. Remember to apply these principles judiciously, as over-engineering can be detrimental to the overall system performance.

What is strategy in Java?

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In the context of software development with Java, a strategy refers to an overall plan or approach to achieve a specific goal or solve a particular problem. It's a high-level concept that defines how a system should behave in terms of decision-making, interactions, and relationships among its components.

In object-oriented programming (OOP), strategies are often used as patterns to encapsulate algorithms and behaviors that can be applied to different situations. These patterns provide a way to define reusable solutions for common problems, making it easier to write flexible, maintainable, and scalable code.

A strategy in Java typically involves the following key elements:

When designing a strategy in Java, you might consider the following best practices:

Some common scenarios where strategies are useful in Java include:

By applying strategies in Java, you can create more modular, flexible, and maintainable code, making it easier to adapt to changing requirements and improve overall software quality.

Hope that helps!