diff --git a/src/Day04.java b/src/Day04.java
new file mode 100644
index 0000000..41f23db
--- /dev/null
+++ b/src/Day04.java
@@ -0,0 +1,27 @@
+import java.io.IOException;
+
+public class Day04 extends Input{
+    private Input input;
+
+    private char[][] sample_in;
+    private char[][] actual_in;
+
+    public Day04() throws IOException {
+        this.input = new Input();
+        this.input.init("in/Day04");
+        this.sample_in = new char[this.input.getSample_input().size()][this.input.getSample_input().getFirst().length()];
+        for(int i = 0; i < this.sample_in.length; i += 1){
+            String s = this.input.getSample_input().get(i).strip();
+            for(int j = 0; j < s.length(); j += 1){
+                this.sample_in[i][j] = s.charAt(j);
+            }
+        }
+        this.actual_in = new char[this.input.getInput().size()][this.input.getInput().getFirst().length()];
+        for(int i = 0; i < this.actual_in.length; i += 1){
+            String s = this.input.getInput().get(i).strip();
+            for(int j = 0; j < s.length(); j += 1){
+                this.actual_in[i][j] = s.charAt(j);
+            }
+        }
+    }
+}
diff --git a/src/Main.java b/src/Main.java
index 1d8c4fb..6e7ae51 100644
--- a/src/Main.java
+++ b/src/Main.java
@@ -82,6 +82,13 @@ public class Main {
         System.out.printf("Day 3 part 1 (sample): %d (%dms)\n", day03_p1_sample, day03_p1_sample_t);
         System.out.printf("Day 3 part 1 : %d (%dms)\n", day03_p1, day03_p1_t);
         System.out.printf("Day 3 part 2 (sample): %d (%dms)\n", day03_p2_sample, day03_p2_sample_t);
-        System.out.printf("Day 3 part 2: %d (%dms)", day03_p2, day03_p2_t);
+        System.out.printf("Day 3 part 2: %d (%dms)\n", day03_p2, day03_p2_t);
+
+        System.out.println("\nDay 4:");
+        start = System.currentTimeMillis();
+        Day04 day04 = new Day04();
+        long day04_init = System.currentTimeMillis() - start;
+
+        System.out.printf("Day 4 init took %dms", day04_init);
     }
 }