12.访问修饰符的不同作用域

Posted 2020-07-14 许先

package test.po;

//学生类
public class Student {
    //属性
    private String name;//姓名
    //分别设置age属性为不同访问修饰符修饰
    /*public int age; 
    int age;
    protected int age;*/
    private int age;//年龄
    private double weight;//体重
    
    //无参构造方法
    public Student() {
        //使用无参构造方法构造学员时，为其属性赋值
        this.name="无名氏";
        this.age=18;
        this.weight=50;
    }

    //构造方法重载 ：带参构造方法
    public Student(String name, int age, double weight) {
        this.name = name;
        this.weight = weight;
        if(age<18 || age>30){
            System.out.println("***输入的年龄为："+age+"，该年龄不合法，将重置!***");
            this.age=18;
        }else{
            this.age = age;
        }
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        if(age<18 || age>30){
            System.out.println("***输入的年龄为："+age+"，该年龄不合法，将重置!***");
            return;

        }
        this.age = age;
    }

    public double getWeight() {
        return weight;
    }

    public void setWeight(double weight) {
        this.weight = weight;
    }

    //方法
    //分别设置study()为不同访问修饰符修饰
    //private void study(){
    //void study(){
    //protected void study(){
    public void study(){
        System.out.println(name+"说：好好学习，天天向上！");
    }
}

package test.oop.demo;

import test.po.Student;

public class TestStudent {
    //测试不同访问修饰符的不同作用域
    public static void main(String[] args) {
        Student student=new Student();
        //测试不同访问修饰符的方法或属性的作用域
        /*student.study(); 
        student.age;*/
    }
}