calendarlist.java

一个JAVA小程序,请大家多多指教,看有什么问题的......

import java.util.Calendar; 

class CalendarList
	{ 
int year,month; 
int dayNum,i,num,count=0; 
Calendar objCalendar; 
int[] arrDayNum={31,28,31,30,31,30,31,31,30,31,30,31}; 
CalendarList(){ 
objCalendar=Calendar.getInstance(); 
this.year=objCalendar.get(Calendar.YEAR); 
this.month=objCalendar.get(Calendar.MONTH)+1; //要+1 
} 
CalendarList(String args0,String args1){ 
this.year=Integer.parseInt(args1); 
this.month=Integer.parseInt(args0); 
objCalendar=Calendar.getInstance();//这里没有get 
objCalendar.set(Calendar.YEAR,year);//set是这样用的 
objCalendar.set(Calendar.MONTH,month-1); 
} 
void display(){ 
System.out.println("\t\t\t"+year+"年"+month+"月"); 
System.out.println("日 一 二 三 四 五 六"); //每个空3个空格 
num=objCalendar.get(Calendar.DAY_OF_WEEK); 
if ((year/4==0&&year/100!=0)||(year/400==0)){ 
arrDayNum[1]+=1; 
} 
for (i=1;i<=12;i++){ 
if (i==month){ 
dayNum=arrDayNum[i-1]; 
break; 
} 
} 
for(i=1;i<=num;i++){ 
System.out.print(" ");//5个空格 
count++; 
} 
for (i=1;i<=dayNum;i++){ 
System.out.print(i<10?" "+i+" ":i+" "); //自己改了下 ,空格数:1,3,3 
count++; 
if(count==7){ 
System.out.println(); 
count=0; 
} 
} 
System.out.println (); 
} 
} 


public class MainClass { 

public static void main(String[] args) { 
CalendarList objCalendar=new CalendarList(); 

CalendarList objCalendar1=new CalendarList("11","2007"); 
objCalendar.display(); 
objCalendar1.display(); 
} 

}