java封装性

原先是class Person{

public string name;

public  int age

}

public void main{

Person person=new person();

person.name("Mike");

person.age(30);

}

封装性之后

class Person{

private String name;

private int age;

get

set

}外部通过

public void main{

//对类实例化 

Person person=new person();

person.getName();

person.getAge();

}