Java十分钟精通类 封装 继承

public Stu() {
        this.name = "**";
    }

 public int getAge() {
        return this.age;
    }
    public void setAge(int age) {
        if(age>0 && age<=100) {
            this.age = age;
        }
        else {
            this.age = 33;
        }
        
    }

public class PM {
    public void say() {
        System.out.println("我有一个亿");
    }
   int money = 10000000;
   public void setMoney(int money) {
       this.money = money;
   }
   public int getMoney() {
       return money;
   }
}
		
子类继承父类的所有属性

public class SE extends PM {
    
    
    
}

package **;

public class Student extends Collegestudent {
    private String name;
    private int age;
    private char sex;
    private String sno;
    //对子类的属性进行封装
    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>0 &&age <=100) {
            this.age = age;
        }
        else {
            this.age = 22;
        }
        
    }

    public char getSex() {
        return sex;
    }

    public void setSex(char sex) {
        this.sex = sex;
    }
    public String getSno() {
        return sno;
    }
    public void setSno(String sno) {
        this.sno = sno;
    } 
}

package **;

public class Collegestudent {
    private String school = "******";
    private String college = "******";
    private String grclass = "******";
    //对父类的属性进行封装
    public String getSchool() {
        return school;
    }

    public void setSchool(String school) {
        this.school = school;
    }

    public String getCollege() {
        return college;
    }

    public void setCollege(String college) {
        this.college = college;
    }

    public String getGrclass() {
        return grclass;
    }

    public void setGrclass(String grclass) {
        this.grclass = grclass;
    }
    
}

package **;
public class main {
    public static void main(String[] args) {
        Student ming = new Student();
        ming.setName("**");
        //如果年龄不符合实际的条件，就体现封装的作用
        ming.setAge(32);
        ming.setSex('男');
        ming.setSno("201805050254");
        System.out.println("我的名字是："+ming.getName()+",我的年龄是："+ming.getAge()+",我的性别是："+ming.getSex()+",我的学号是："+ming.getSno());
        //子类student中没有学校、学院、班级，所以在子类中扩展父类
        System.out.println("我的学校是："+ming.getSchool()+",我的学院是："+ming.getCollege()+",我的班级为："+ming.getGrclass());
    }
}