输出来换行没起到作用，最后的\n完全没反应
public class rili2 {
public static void main(String[] args){
int sum=0;
for(int year=1900;year<=2015;year++){
if(year%4==0&&year%100!=0||year%400==0){
sum+=366;
}else{
sum+=365;
}
}
for(int month=1;month<=6;month++){
if(month==2){
if(2016%4==0&&2016%100!=0||2016%400==0){
sum+=29;
}else{
sum+=28;
}
}else{
if(month==4||month==6||month==9||month==11){
sum+=30;
}else{
sum+=31;
}
}
}
sum+=1;
int wekday=sum%7;
System.out.println("日\t一\t二\t三\t四\t五\t六");
for(int i=1;i<=wekday;i++){
System.out.print("\t");
}
for(int i=1;i<=30;i++){
if(sum%7==6){
System.out.print(i+"\n");
}else{
System.out.print(i+"\t");
}
}
}
}