09封装

封装

对类的封装

符合高内聚低耦合

1. 提高程序的安全性 保护数据
2. 隐藏代码的实现细节
3. 统一接口 public 的get set方法
4. 系统可维护性增加
5. 封装可与重载搭配

package dome01.oop;

public class Student {
    private String name;
    private String sex;
    private String id;
    private int age;

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

    public String getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex;
    }

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        if(age>80||age<0){
            System.out.println("您的年龄不合格");
            this.age = 00;
        }else{
            this.age = age;
        }

    }
}

封装的调用

package dome01.oop;

public class Appliation02 {
    public static void main(String[] args) {
        Student s1=new Student();
        s1.setName("杨圣杰");
        System.out.println(s1.getName());
        s1.setAge(100);
        System.out.println(s1.getAge());

    }
}