Java面向对象之继承、构造方法、重写、重载

public class A {
    
}

public class A {
    public A(){
        System.out.println("构造方法A（）");
    }
}

public class Test {
    public static void main(String[] args) {
        A a = new A();
    }
}

public class A {
    public A() {
    }

    public A(String a, String b) {
        System.out.println(a + b);
    }
}

public class Test {
    public static void main(String[] args) {
        A a = new A("aaa", "bbb");
    }
}

public class Ren {
    public final String shou = "两只手";
    public final String jiao = "两只脚";
    public final String yan = "两只眼";

    public void chi() {
        System.out.println("会吃");
    }

    public void he() {
        System.out.println("会喝");
    }

}

public class Siji extends Ren {
    public void kai() {
        System.out.println("会开车");
    }
}

public class Test {
    public static void main(String[] args) {
        Siji b = new Siji();
        System.out.println(b.jiao);
        System.out.println(b.shou);
        System.out.println(b.yan);
        b.chi();
        b.he();
        b.kai();
    }
}

public class Siji extends Ren {
    public void kai() {
        System.out.println("会开车");
    }

    public void chi() {
        System.out.println("会吃屎");
    }
}