A simple example of learning java: Perpetual Calendar

A simple example of learning java: Perpetual Calendar

Import java. util. california; public class Calender {public static boolean isRun (int year) // determines whether it is a leap year {if (year % 4 = 0 & year % 100! = 0) | (year % 400 = 0) {return true;} else {return false;} public static int calDay (int year, int mth) // determine the number of days in the month of a year {int days = 31; switch (mth) {case 4: case 6: case 9: case 11: days = 30; break; case 2: if (isRun (year) {days = 29;} else {days = 28;} break;} return days;} public static int calFirstDay (int year, int mth) // determines the day of the week when the first day of a certain year is the day of the week {int FirstDay = 0; // Monday int I = 1901; int tmpday = 0; for (I = 1900; I