Java 不同类型的重载方法

public class Calculator {
    public int sum(int a, int b) {
        return a + b;
    }

    public double sum(double a, double b) {
        return a + b;
    }
}

public class Printer {
    public void print(String message) {
        System.out.println(message);
    }

    public void print(String message, int count) {
        for (int i = 0; i < count; i++) {
            System.out.println(message);
        }
    }
}

public class Sorter {
    public void sort(int[] arr) {
        // 按照升序排序
    }

    public void sort(int[] arr, boolean ascending) {
        // 按照指定顺序排序
    }
}

public class Aggregator {
    public int sum(int... numbers) {
        int sum = 0;
        for (int number : numbers) {
            sum += number;
        }
        return sum;
    }
}

public class Animal {
    public Animal makeSound() {
        return new Animal(); // 返回基类类型的对象
    }
}

public class Dog extends Animal {
    @Override
    public Dog makeSound() {
        return new Dog(); // 返回派生类类型的对象
    }
}

public class Printer {
    public void print(String message) {
        System.out.println("Printing string: " + message);
    }

    public void print(int number) {
        System.out.println("Printing number: " + number);
    }

    public static void main(String[] args) {
        Printer printer = new Printer();
        printer.print("Hello world!");
        printer.print(123);
    }
}

Printing string: Hello world!
Printing number: 123