抽象类和类的继承。创建抽象类Person，具备name属性，显示类信息的抽象方法display()，子类Student和Employee重写父类的抽象方法。

冷不防 2022-04-18 00:28 200阅读 0赞

**抽象类和类的继承。**

1.  创建抽象类Person，具有name属性，包含一个参数——姓名的构造方法，具备显示类信息的抽象方法display()。
2.  创建Person的子类Student，属性包括姓名、年级、专业。重写父类的抽象方法。注意在类的继承中不能继承父类的构造方法。
3.  创建Person的子类Employee，属性包括姓名、工资。重写父类的抽象方法，并添加获得工资和增加工资的方法。
4.  创建测试类，分别创建学生类和员工类，并输出他们的信息。

### 代码： ###

**Person.java**

import java.util.Scanner;
    
    abstract public class Person {
    	
    	public String name;
    	abstract void display();
    }
    
    class Student extends Person {
    	
    	public String name;
    	public String grade;
    	public String major;
    	
    	void display(String _name, String _grade, String _major) {
    		name = _name;
    		grade = _grade;
    		major = _major;
    		System.out.println("My name is " + name);
    		System.out.println("My grade is " + grade);
    		System.out.println("My major is " + major);
    	}
    }
    
    class Employee extends Person {
    	
    	public String name;
    	public int salary;
    
    	void display(String _name, int _salary) {
    		name = _name;
    		salary = _salary;
    		System.out.println("My name is " + name);
    		System.out.println("My salary is " + salary);
    	}
    	
    	void addMoney(){
    		int salary=10000;
    		System.out.println("请输入加薪数目：");
    		Scanner sc = new Scanner(System.in);
    		int increases = sc.nextInt();
    		salary = salary + increases;
    		System.out.println("当前工资数目：" + salary);
    	}
    	
    	void getMoney(){
    		int salary=10000;
    		System.out.println("请输入需要取走的工资金额：");
    		Scanner sc = new Scanner(System.in);
    		int withdrawals = sc.nextInt();
    		if(withdrawals <= salary) {
    			salary = salary - withdrawals;
    			System.out.println("当前工资余额：" + salary);
    		}else {
    			System.out.println("当前余额不足！");
    		}
    	}	
    }

**PrintInfo.java**

public class PrintInfo {
    
    	public static void main(String[] args) {
    		Student student1 = new Student();
    		student1.display("小明","2017级","计算机");
    		
    		Employee employee1 = new Employee();
    		employee1.display("大明",10000);
    		employee1.addMoney();
    		employee1.getMoney();
    	}
    }