试试这个：
import java.util.Scanner;class Easter{ public static void main(String[] args) { System.out.print("Please enter a year to calculate Easter Sundayn>"); Scanner s = new Scanner(System.in); int inputted = getResult(s); while(inputted <= 0) { System.out.print("Expected a positive year. Please try again:n>"); inputted = getResult(s); } System.out.println(getEasterSundayDate(inputted)); } private static int getResult(Scanner s) { while(!s.hasNextInt()) { System.out.print("Expected a valid year. Please try again:n>"); s.nextLine(); } return s.nextInt(); } public static String getEasterSundayDate(int year) { int a = year % 19, b = year / 100, c = year % 100, d = b / 4, e = b % 4, g = (8 * b + 13) / 25, h = (19 * a + b - d - g + 15) % 30, j = c / 4, k = c % 4, m = (a + 11 * h) / 319, r = (2 * e + 2 * j - k - h + m + 32) % 7, n = (h - m + r + 90) / 25, p = (h - m + r + n + 19) % 32; String result; switch(n) { case 1: result = "January "; break; case 2: result = "February "; break; case 3: result = "March "; break; case 4: result = "April "; break; case 5: result = "May "; break; case 6: result = "June "; break; case 7: result = "July "; break; case 8: result = "August "; break; case 9: result = "September "; break; case 10: result = "October "; break; case 11: result = "November "; break; case 12: result = "December "; break; default: result = "error"; } return result + p; }}2001结果的输入
April 15作为输出。
