Java 新手入门：重载和重写傻傻分不清？一篇文章带你清晰理解！

public class Restaurant {
 
    // 不辣的鱼香肉丝
    public void orderYuXiangRouSi() {
        System.out.println("您点的是不辣的鱼香肉丝。");
    }
 
    // 微辣的鱼香肉丝
    public void orderYuXiangRouSi(String spicyLevel) {
        System.out.println("您点的是" + spicyLevel + "的鱼香肉丝。");
    }
 
    // 例如，可以根据人数点不同分量的鱼香肉丝
    public void orderYuXiangRouSi(int peopleCount) {
        System.out.println("您点了" + peopleCount + "人份的鱼香肉丝。");
    }
 
    // 还可以根据辣度和人数点餐
    public void orderYuXiangRouSi(String spicyLevel, int peopleCount) {
        System.out.println("您点了" + peopleCount +"人份" + spicyLevel + "的鱼香肉丝。");
    }
 
    public static void main(String[] args) {
        Restaurant restaurant = new Restaurant();
        restaurant.orderYuXiangRouSi(); // 调用不带参数的方法
        restaurant.orderYuXiangRouSi("微辣"); // 调用带辣度参数的方法
        restaurant.orderYuXiangRouSi(3); // 调用带人数参数的方法
        restaurant.orderYuXiangRouSi("中辣", 2); // 调用带辣度和人数参数的方法
    }
}

public class Calculator {
 
    public int add(int a, int b) {
        return a + b;
    }
 
    public double add(double a, double b) {
        return a + b;
    }
 
    public int add(int... numbers) {
        int sum = 0;
        for (int number : numbers) {
            sum += number;
        }
        return sum;
    }
}

class Animal {
    public void makeSound() {
        System.out.println("动物发出声音");
    }
    
    public void eat(){
        System.out.println("动物正在进食");
    }
}
 
class Cat extends Animal {
    @Override
    public void makeSound() {
        System.out.println("喵喵喵");
    }
 
    @Override
    public void eat(){
        System.out.println("猫咪使用猫粮进食");
    }
}
 
class Dog extends Animal {
    @Override
    public void makeSound() {
        System.out.println("汪汪汪");
    }
 
    @Override
    public void eat(){
        System.out.println("狗狗使用狗粮进食");
    }
}
 
public class Test {
    public static void main(String[] args) {
        Animal animal = new Animal();
        animal.makeSound(); // 输出：动物发出声音
        animal.eat(); // 输出：动物正在进食
 
        Cat cat = new Cat();
        cat.makeSound(); // 输出：喵喵喵
        cat.eat(); // 输出：猫咪使用猫粮进食
 
        Dog dog = new Dog();
        dog.makeSound(); // 输出：汪汪汪
        dog.eat(); // 输出：狗狗使用狗粮进食
    }
}

import javax.swing.*;
import java.awt.*;
 
public class MyPanel extends JPanel {
 
    @Override
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        // 自定义绘图逻辑，例如绘制一个红色的矩形
        g.setColor(Color.RED);
        g.fillRect(10, 10, 50, 50);
    }
}