java学习

学习一下代码

class BirthDate{
    int day,month,year;
    public BirthDate(int d,int m,int y){
        day=d;month=m;year=y;
    }
    
    public void SetDay(int d){
        day=d;
    }
    
    public void display(){
        System.out.println(day+"-"+month+"-"+year);
    }
}