package com;

public class ClassA {
    private int x;
    
    private int y;
    
    //ClassA的构造函数  属性设置器等
    public ClassA(int x, int y) {
        this.x = x;
        this.y = y;
    }
    
    class ClassB {
        public int add() {
            return x + y; 
        }
    }
    
    public ClassB getClassB() {
        return new ClassB();
    }
    
    public static void main(String[] args) {
        ClassA a = new ClassA(3, 5);
        ClassA.ClassB b = a.getClassB();
        System.out.println(b.add());
    }
}