编一个java程序，用来判断指定年份是否是闰年。

public class RunNian {
public static void isRunNian(int year){
if(year%4==0&&year%100!=0){
System.out.println(year+"年是润年");
}
else if(year%400==0){
System.out.println(year+"年是润年");
}
else{
System.out.println(year+"年不是润年");
}
}
public static void main(String[] args) {
//test
isRunNian(2000);
isRunNian(2008);
isRunNian(1900);
isRunNian(2009);
}
}

JAVA中有闰年的判断的
GregorianCalendar gc=new GregorianCalendar();
boolean PD=year.isLeapYear（int year）;
true就是,false就不是

int year = 3000;
boolean flag =false;
if((year%4==0)&&(year%100!=0))
{
flag=true;
}
else if(year%400==0)
{
flag=true;
}else
{
flag=false;
}
System.out.println(flag);