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diff --git a/challenge-138/abigail/java/ch-1.java b/challenge-138/abigail/java/ch-1.java
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+++ b/challenge-138/abigail/java/ch-1.java
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+//
+// See ../README.md
+//
+
+//
+// Run as: ln ch-1.java ch1.java; javac ch1.java; java ch1 < input-file
+//
+
+import java.util.*;
+
+public class ch1 {
+    static int [] [] lookup = {
+        {261, 260, 260, 261, 261, 261, 261},
+        {262, 261, 260, 261, 262, 262, 262},
+    };
+
+    public static final int SUNDAY    = 0;
+    public static final int MONDAY    = 1;
+    public static final int TUESDAY   = 2;
+    public static final int WEDNESDAY = 3;
+    public static final int THURSDAY  = 4;
+    public static final int FRIDAY    = 5;
+    public static final int SATURDAY  = 6;
+
+    static int [] anchors = {TUESDAY, SUNDAY, FRIDAY, WEDNESDAY};
+
+    public static int doomsday (int year) {
+        int anchor = anchors [(year / 100) % 4];
+        int y      = year % 100;
+        return (((y / 12) + (y % 12) + ((y % 12) / 4)) + anchor) % 7;
+    }
+
+    public static int is_leap (int year) {
+        if ((year % 400 == 0) || (year % 4 == 0) && (year % 100 != 0)) {
+            return 1;
+        }
+        return 0;
+    }
+
+    public static void main (String [] args) {
+        Scanner scanner = new Scanner (System . in);
+        while (scanner . hasNextInt ()) {
+            int year = scanner . nextInt ();
+            System . out . println (lookup [is_leap (year)] [doomsday (year)]);
+        }
+    }
+}