First challenge of Google foo bar: Braille Translation

src/main/java/random/googlefoobar/level1/Solution.java

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+package random.googlefoobar.level1;
+
+public class Solution {
+    public final static String space = "000000";
+    public final static String upper = "000001";
+    public final static String[] letter = new String[]{
+            "100000", // a
+            "110000", // b
+            "100100", // c
+            "100110", // d
+            "100010", // e
+            "110100", // f
+            "110110", // g
+            "110010", // h
+            "010100", // i
+            "010110", // j
+            "101000", // k
+            "111000", // l
+            "101100", // m
+            "101110", // n
+            "101010", // o
+            "111100", // p
+            "111110", // q
+            "111010", // r
+            "011100", // s
+            "011110", // t
+            "101001", // u
+            "111001", // v
+            "010111", // w
+            "101101", // x
+            "101111", // y
+            "101011", // z
+    };
+
+    public static String solution(String s) {
+        int length = s.length();
+        StringBuilder sb = new StringBuilder();
+        for (int i = 0; i < length; i++) {
+            char c = s.charAt(i);
+            sb.append(getIntegerValue(c));
+        }
+        return sb.toString();
+    }
+
+    public static String getIntegerValue(char c) {
+        if (c == ' ') return space;
+        StringBuilder b = new StringBuilder();
+        int diff = 0;
+        if (Character.isUpperCase(c)) {
+            diff = (int) c - (int) 'A';
+            b.append(upper);
+        } else
+            diff = (int) c - (int) 'a';
+
+        b.append(letter[diff]);
+        return b.toString();
+    }
+
+    public static void main(String[] args) {
+        String plaintext1 = "The quick brown fox jumps over the lazy dog";
+        System.out.println(Solution.solution(plaintext1));
+
+    }
+}