java类和对象以及继承关系

// 定义一个星星类（父类）
class Star {
    protected String name;

    public Star(String name) {
        this.name = name;
    }

    public void shine() {
        System.out.println(name + " is shining.");
    }
}

// 定义一个行星类（子类），继承自星星类
class Planet extends Star {
    private String type;

    public Planet(String name, String type) {
        super(name);
        this.type = type;
    }

    public void orbit() {
        System.out.println(name + " is orbiting.");
    }
}

// 定义一个矮行星类（子类），继承自行星类
class DwarfPlanet extends Planet {
    public DwarfPlanet(String name, String type) {
        super(name, type);
    }

    public void rotate() {
        System.out.println(name + " is rotating.");
    }
}

// 定义一个恒星类（子类），继承自星星类
class Star {
    private String temperature;

    public Star(String name, String temperature) {
        super(name);
        this.temperature = temperature;
    }

    public void burn() {
        System.out.println(name + " is burning.");
    }
}

// 创建对象并调用方法
public class Main {
    public static void main(String[] args) {
        // 创建行星对象
        Planet earth = new Planet("Earth", "Terrestrial");
        earth.shine();    // 输出：Earth is shining.
        earth.orbit();    // 输出：Earth is orbiting.

        // 创建矮行星对象
        DwarfPlanet pluto = new DwarfPlanet("Pluto", "Trans-Neptunian");
        pluto.shine();    // 输出：Pluto is shining.
        pluto.orbit();    // 输出：Pluto is orbiting.
        pluto.rotate();   // 输出：Pluto is rotating.

        // 创建恒星对象
        Star sun = new Star("Sun", "Hottest");
        sun.shine();      // 输出：Sun is shining.
        sun.burn();       // 输出：Sun is burning.
    }
}