//根据输入的年月日，确定这一天是星期几final int year = 1900;int sum;Scanner input = new Scanner(System.in);System.out.print("请输入年份：");int years = input.nextInt();System.out.print("请输入月份：");int months = input.nextInt();System.out.print("请输入日：");int days = input.nextInt();if (years>year) {if (years % 4 == 0 && years % 100 != 0 || years % 400 == 0) {sum = (years-year)*365+(years-year)/4-1+days;} else {sum = (years-year)*365+(years-year)/4+days;}for (int i = 1,j; i < months; i++) {j=31;switch (i){ case 4: case 6: case 9: case 11:j=30;break;case 2:j= year%4==0?29:28;break;}sum +=j;}switch (sum % 7 ){case 0:System.out.println(years+"年"+months+"月"+days+"日"+"是星期天");break;case 1:System.out.println(years+"年"+months+"月"+days+"日"+"是星期一");break;case 2:System.out.println(years+"年"+months+"月"+days+"日"+"是星期二");break;case 3:System.out.println(years+"年"+months+"月"+days+"日"+"是星期三");break;case 4:System.out.println(years+"年"+months+"月"+days+"日"+"是星期四");break;case 5:System.out.println(years+"年"+months+"月"+days+"日"+"是星期五");break;case 6:System.out.println(years+"年"+months+"月"+days+"日"+"是星期六");break;}}else {System.out.println("您输入的年份不对");}
实验结果
