date5.java.bak

来自「这是java实例的书上例题」· BAK 代码 · 共 9 行

public abstract class Date5 
{
    public abstract boolean isValid(int year,int month,int day);
    public abstract Date5   tomorrow();
    public abstract Date5   yestoday();
    public abstract Date5   daysAfter(int days);
    public abstract int     between(Date5 d2);
}