访问修饰符有private、protected、public。私有变量和私有方法（private）有一个A类，他的成员变量和方法都是私有public class A {
private int a;
private int sum (int m,int n){
return m - n;
}
}那么对于另一个B类，在其中创建一个A类的对象，该对象是不能访问自
As I was writing my first semester of teaching reflection, I got the idea to kick off a series of student questions called Coding Tangents. In this series, I’ll be tackling student questions with clea
