- Tidied up folder for Java contribution.

1 files changed, 77 insertions, 0 deletions

diff --git a/challenge-137/mohammad-anwar/java/theweeklychallenge/LongYear.java b/challenge-137/mohammad-anwar/java/theweeklychallenge/LongYear.java
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+++ b/challenge-137/mohammad-anwar/java/theweeklychallenge/LongYear.java
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+package theweeklychallenge;
+
+/*
+
+Week 137:
+
+    https://theweeklychallenge.org/blog/perl-weekly-challenge-137
+
+Task #1: Long Year
+
+    Write a script to find all the years between 1900 and 2100 which is a Long Year.
+
+*/
+
+import java.util.*;
+import java.time.Year;
+import java.time.LocalDate;
+import java.time.temporal.IsoFields;
+
+import junit.framework.TestCase;
+import static junit.framework.Assert.*;
+
+public class LongYear extends TestCase {
+
+    public static void main(String[] args) {
+        junit.textui.TestRunner.run(theweeklychallenge.LongYear.class);
+    }
+
+    public void testLongYear() {
+
+        List<Integer> exp = Arrays.asList(
+                      1903, 1908, 1914, 1920, 1925,
+                      1931, 1936, 1942, 1948, 1953,
+                      1959, 1964, 1970, 1976, 1981,
+                      1987, 1992, 1998, 2004, 2009,
+                      2015, 2020, 2026, 2032, 2037,
+                      2043, 2048, 2054, 2060, 2065,
+                      2071, 2076, 2082, 2088, 2093,
+                      2099 );
+
+        List<Integer> got = new ArrayList<Integer>();
+        for (int y = 1900; y <= 2100; y++) {
+            if (isLongYear(y)) {
+                got.add(y);
+            }
+        }
+
+        assertTrue(got.equals(exp));
+    }
+
+    public static boolean isLongYear(int y) {
+        if (getWeekNumber(y, 12, 31) == 53) {
+            if (Year.isLeap(y)) {
+                if (getDayOfWeek(y, 1, 1) == 3
+                    || getDayOfWeek(y, 12, 31) == 5) {
+                    return true;
+                }
+            }
+            else {
+                if (getDayOfWeek(y, 1, 1) == 4
+                    || getDayOfWeek(y, 12, 31) == 4) {
+                    return true;
+                }
+            }
+        }
+
+        return false;
+    }
+
+    public static int getDayOfWeek(int year, int month, int day) {
+        return LocalDate.of(year, month, day).getDayOfWeek().getValue();
+    }
+
+    public static int getWeekNumber(int year, int month, int day) {
+        return LocalDate.of(year, month, day).get(IsoFields.WEEK_OF_WEEK_BASED_YEAR);
+    }
+}