java学习——构造类之3！+5！=126

package my_project;

import java.util.Scanner;

public class my_first_class {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner in = new Scanner(System.in);
        number x1 = new number();
        number x2 = new number();
        x1.setNum(in.nextInt());
        x2.setNum(in.nextInt());
        int sum=x1.jieChen()+x2.jieChen();
        System.out.println(x1.getNum()+ "! +  "+x2.getNum()+"! = "+ sum);
        
    }

}

class number{
    
    private int num;
    
    public int getNum()
    {
        return num;
    }
    
    public void setNum(int num)
    {
        this.num=num;
    }
    
    public int jieChen() //没有static是针对某一对象的
    {
        int s=1;
        for(int i=1;i<=num;i++)
        {
            s=s*i;
        }
        return s;
    }
}