Java基础编程题目——定义抽象类并继承

系统管理员 2023-07-18 06:50 4阅读 0赞

**抽象类的定义规则：**  
**抽象类和抽象方法都必须用abstract关键字来修饰。**  
**抽象类不能被实例化，也就是不能用new关键字去产生对象。**  
**抽象方法只需声明，而不需实现。**  
**含有抽象方法的类必须被声明为抽象类，抽象类的子类必须复写所有的抽象方法后才能被实例化，否则这个子类还是个抽象类。**

import java.util.SplittableRandom;
    
    public class text {
        
        public static void main(String[] args) {
        
            Student P = new Student("张三", 20, "学生");
            Worker S = new Worker("李四", 30, "工人");
            P.talk();
            S.talk();
        }
    }
    
    abstract class Person {
              //创建一个抽象类
        String name;
        int age;
        String occupation;
    
        abstract void talk();   //声明一个方法
    }
    
    class Student extends Person {
           //继承抽象类
        public Student(String name, int age, String occupation) {
        
            this.name = name;
            this.age = age;
            this.occupation = occupation;
        }
    
        public void talk() {
              //复写抽象类的函数
            System.out.println(this.occupation + "——>姓名：" +
                    this.name + "，年龄：" +
                    this.age + "，职业：" +
                    this.occupation + "！");
        }
    }
    
    class Worker extends Person {
           //继承抽象类
        public Worker(String name, int age, String occupation) {
        
            this.name = name;
            this.age = age;
            this.occupation = occupation;
        }
    
        public void talk() {
        		//复写抽象类的函数
            System.out.println(this.occupation + "——>姓名：" +
                    this.name + "，年龄：" +
                    this.age + "，职业：" +
                    this.occupation + "！");
        }
    }