答案:源程序为:import java.util.*;publicclass Ex10_Answer_11{publicstaticvoid main(String args[]){int year,month,day;int days=0;int d=0;int e;input fymd=new input();do{e=0;System.out.print("输入年:");year=fymd.input();System.out.print("输入月:");month=fymd.input();System.out.print("输入日:");day=fymd.input();if(year<0||month<0||month>12||day<0||day>31){System.out.println("输入错误,请重新输入!");e=1;}}while(e==1);for(int i=1;i