Strategy design pattern best example

it allows to choose a algorithms from the family of algorithms

// Strategy Interface
interface SortingStrategy {
    void sort(int[] arr);
}

// Concrete Strategies
class BubbleSort implements SortingStrategy {
    public void sort(int[] arr) {
        // Implementation of Bubble Sort algorithm
    }
}

class MergeSort implements SortingStrategy {
    public void sort(int[] arr) {
        // Implementation of Merge Sort algorithm
    }
}

class QuickSort implements SortingStrategy {
    public void sort(int[] arr) {
        // Implementation of Quick Sort algorithm
    }
}

// Context
class Sorter {
    private SortingStrategy strategy;

    public Sorter(SortingStrategy strategy) {
        this.strategy = strategy;
    }

    public void setStrategy(SortingStrategy strategy) {
        this.strategy = strategy;
    }

    public void performSort(int[] arr) {
        strategy.sort(arr);
    }
}

// Usage
public class Main {
    public static void main(String[] args) {
        int[] arr = {5, 2, 7, 1, 9, 3};

        Sorter sorter = new Sorter(new BubbleSort()); // Initialize with Bubble Sort strategy
        sorter.performSort(arr);

        // Switch to Merge Sort strategy
        sorter.setStrategy(new MergeSort());
        sorter.performSort(arr);

        // Switch to Quick Sort strategy
        sorter.setStrategy(new QuickSort());
        sorter.performSort(arr);
    }
}