编写Person类，含有私有变量String name、 int age ;方法speak0 ;

2.编写Person类，含有私有变量String name、 int age ;方法speak0 ;
编写Student类继承Person类,有私有变量int grade、 String zhuanye ;方法speak0;实现类的继承及方法的覆盖

Person类

public class Person {
    private String name;

    private int age;

    public void speak() {
        System.out.println("person speak");
    }
}

Student类

public class Student extends Person{

    private int grade;

    private String zhuanye;

    @Override
    public void speak() {
        System.out.println("student speak");
    }
}

测试类

public class test {
    public static void main(String[] args) {
        Student student = new Student();
        student.speak();

        Person person = new Person();
        person.speak();
    }
}

输出结果

student speak
person speak

Process finished with exit code 0

希望能帮到你

public class Person {

    private String name;
    
    private int age;
    
    public void speak(){
        
    }
}

public class Student extends Person {

    private int grade;

    private String zhuanye;

    @Override
    public void speak() {
        super.speak();
    }
}