JAVA里怎么得出一个月的第一天是星期几？ JAVA输入月份求当月第一天是星期几？
\u6025\uff1a\u7528java\u5982\u4f55\u5f97\u5230\u5f53\u524d\u6708\u7684\u7b2c\u4e00\u5929\u662f\u661f\u671f\u51e0\uff1f\u8fd9\u4e2a\u6bd4\u8f83\u7b80\u5355\uff0c4\u884c\u4ee3\u7801\u5c31\u884c
Calendar calendar = Calendar.getInstance();
calendar.set(Calendar.DAY_OF_MONTH, 1);
SimpleDateFormat format = new SimpleDateFormat("E");
System.out.println("\u672c\u6708\u7b2c\u4e00\u5929\u662f\uff1a" + format.format(calendar.getTime()));
\u5982\u679c\u4f60\u8981\u5f97\u5230\u4e00\u4e2a\u6570\u5b57\u7684\u8bdd\u5c31\u662f\uff1a
calendar.get(Calendar.DAY_OF_WEEK)\uff0c\u5f53\u7136\uff0c\u8fd9\u4e2a\u7ed3\u679c\u662f\u4ee5\u661f\u671f\u5929\u4e3a\u7b2c\u4e00\u5929\u7b97\u51fa\u6765\u7684\uff0c\u5982\u679c\u8981\u6362\u6210\u661f\u671f\u4e00\u5f00\u59cb\uff0c\u51cf1\u5c31\u884c\u4e86
\u5e0c\u671b\u80fd\u5e2e\u52a9\u4f60\u3002
\u7ed9\u4f60\u4e00\u4e2a\u4ee3\u7801\u5427\uff1a
import java.util.Scanner;
public class wnl {
/**
* @param args
*/
public static void main(String[] args) {
// TODO \u81ea\u52a8\u751f\u6210\u65b9\u6cd5\u5b58\u6839
int totalDay=0; //\u8ba1\u7b97\u603b\u5929\u6570
int dayOfWeek;//\u4fdd\u5b58\u5f53\u6708\u7b2c\u4e00\u5929\u662f\u661f\u671f\u51e0
int day=0 ; //\u5f53\u6708\u7684\u5929\u6570
int dayOfYear=0; //\u4fdd\u5b58\u7528\u6237\u8f93\u5165\u7684\u5e74\u6708\u4e4b\u524d\u7684\u5929\u6570
Scanner cs=new Scanner(System.in);
System.out.print("\u8bf7\u8f93\u5165\u5e74:");
int year=cs.nextInt();
System.out.print("\u8bf7\u8f93\u5165\u6708:");
int month=cs.nextInt();
boolean bool=false;
// \u5224\u65ad\u8f93\u5165\u7684\u5e74\u4efd\u662f\u5426\u662f\u95f0\u5e74\u5907\u7528
if(year%4==0&&year%100!=0||year%400==0){
bool=true;
}
// \u8ba1\u7b97\u51fa\u5230\u7528\u6237\u8f93\u5165\u7684\u5e74\u4efd1\u67081\u65e5\u4e4b\u524d\u7684\u603b\u5929\u6570
for(int i=1900;i<year;i++){
if(i%4==0&&i%100!=0||i%400==0){
totalDay+=366;
}else{
totalDay+=365;
}
}
for(int i=1;i<=month;i++){
switch(i){ //\u6839\u636e\u6708\u4e0d\u540c\u7ed9day\u8d4b\u503c\u8fdb\u884c\u8ba1\u7b97
case 1: //\u540c\u65f6day\u8fd8\u4f1a\u7528\u4e8e\u4fdd\u5b58\u5f53\u6708\u5929\u6570\u540e\u9762\u7684\u8f93\u51fa
case 3:
case 5:
case 7:
case 8:
case 10:
case 12:day=31;break;
case 4:
case 6:
case 9:
case 11:day=30;break;
// \u6839\u636e\u662f\u5426\u95f0\u5e74\u6765\u51b3\u5b9a2\u6708\u591a\u5c11\u5929
case 2:if(bool){
day=29;
break;
}else{
day=28;
break;
}
//\u5728\u83b7\u5f97\u8f93\u5165\u6708\u4efd\u4e4b\u524d\u6240\u6709\u5929\u6570\u7684\u540c\u65f6
//\u8fd8\u83b7\u5f97\u4e86\u8f93\u5165\u6708\u4efd\u7684\u5929\u6570\u5907\u7528
}
if(i<month){
dayOfYear+=day;//\u628a\u7528\u6237\u8f93\u5165\u7684\u6708\u4efd\u4e4b\u524d\u7684\u6240\u6709\u5929
} //\u6570\u8fdb\u884c\u52a0\u5408
}
//\u5c06\u672c\u5e74\u7684\u5929\u6570\u52a0\u5728\u4e4b\u524d\u8ba1\u7b97\u7684\u603b\u5929\u6570\u4e0a
totalDay+=dayOfYear;
// \u628a\u603b\u5929\u6570\u5bf97\u53d6\u4f59\u8ba1\u7b97\u51fa\u5f53\u6708\u7b2c\u4e00\u5929\u662f\u661f\u671f\u51e0
dayOfWeek=(1+totalDay)%7;
System.out.println("\u661f\u671f\u5929\t\u661f\u671f\u4e00\t\u661f\u671f\u4e8c\t\u661f\u671f\u4e09\t\u661f\u671f\u56db\t\u661f\u671f\u4e94\t\u661f\u671f\u516d");
// \u8f93\u51fa\u7a7a\u683c
for(int i=0;i<dayOfWeek;i++){
System.out.print("\t");
}
for(int i=1;i<=day;i++){
//\u63a7\u5236\u6bcf\u5230\u661f\u671f6\u5c31\u6362\u884c
//\u539f\u7406\u4e3a\u603b\u5929\u6570\u52a0\u4e0a\u5f53\u6708\u5929\u6570\u5bf97\u53d6\u4f59
if((totalDay+i)%7==6){
System.out.print(i+"\n");
}else{
System.out.print(i+"\t");
}
}
}
}
如
Calendar rightNow = Calendar.getInstance();
rightNow.set(2007, 4, 1);
System.out.println(rightNow.DAY_OF_WEEK);
输出7 说明2007年4月1日是星期日
只要知道上个月30或31是星期几就行了！！！
楼上，System.out.println(rightNow.DAY_OF_WEEK);
输出7 说明2007年4月1日是星期日，输出7说明是星期六？
DAY_OF_WEEK是从 1:星期日->2:星期一->..->-7:星期六
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