1. 其它 请编写一个Person类，至少包含三个属性，两个方法，并创建一个Person的对象（对象名为你姓名的拼音），完成对属性赋值和方法调用。 定义一个学生类继承Person类，测试子类继承父类中哪些属性和方法，当子类重写父类中某个方法时，如何让其调用父类中的方法。

Person类：

public class Person {
    private String name;
    private int age;
    private String gender;

    public Person(String name, int age, String gender) {
        this.name = name;
        this.age = age;
        this.gender = gender;
    }

    public void introduce() {
        System.out.println("My name is " + this.name + ", I am " + this.age + " years old, and I am " + this.gender + ".");
    }

    public void sayHello() {
        System.out.println("Hello, my name is " + this.name + ".");
    }
}

创建对象：

Person huangxing = new Person("Huang Xing", 28, "male");
huangxing.introduce();
huangxing.sayHello();

输出：

My name is Huang Xing, I am 28 years old, and I am male.
Hello, my name is Huang Xing.

学生类：

public class Student extends Person {
    private int grade;
    private String major;

    public Student(String name, int age, String gender, int grade, String major) {
        super(name, age, gender);
        this.grade = grade;
        this.major = major;
    }

    @Override
    public void introduce() {
        super.introduce();
        System.out.println("I am a student in grade " + this.grade + ", majoring in " + this.major + ".");
    }

    public void study() {
        System.out.println("I am studying...");
    }
}

测试：

Student huangxing = new Student("Huang Xing", 28, "male", 5, "Computer Science");
huangxing.introduce();
huangxing.sayHello();
huangxing.study();

输出：

My name is Huang Xing, I am 28 years old, and I am male.
I am a student in grade 5, majoring in Computer Science.
Hello, my name is Huang Xing.
I am studying...

子类继承了父类中的属性和方法，可以直接使用。子类可以重写父类中的方法，使用`@Override`注解进行标识。如果子类想要调用父类中的方法，可以使用`super`关键字。例如，在`Student`类中重写了`introduce()`方法，但是又想要调用父类中的`introduce()`方法，可以这样写：

@Override
public void introduce() {
    super.introduce();
    System.out.println("I am a student in grade " + this.grade + ", majoring in " + this.major + ".");
}