获取当前月份开始向后推的12个月

public static void main(String[] args) {
Calendar cal = Calendar.getInstance();
int year = cal.get(Calendar.YEAR);
// int month = cal.get(Calendar.MONTH )+1;
int month = 3;
String b = "";
for (int i = 1; i < 13; i++) {
if(month>0){
if(i<10){
b=year+"_0"+i;
}else{
b=year+"_"+i;
}
System.out.println(b);
}else{
if(i<10){
b=year-1+"_0"+i;
}else{
b=year-1+"_"+i;
}
System.out.println(b);
}
month--;
}

}