diff --git a/tests/src/com/android/inputmethod/keyboard/layout/expected/AbstractKeyboardBuilder.java b/tests/src/com/android/inputmethod/keyboard/layout/expected/AbstractKeyboardBuilder.java
index 3365b92..6e72104 100644
--- a/tests/src/com/android/inputmethod/keyboard/layout/expected/AbstractKeyboardBuilder.java
+++ b/tests/src/com/android/inputmethod/keyboard/layout/expected/AbstractKeyboardBuilder.java
@@ -21,9 +21,9 @@
 /**
  * This class builds a keyboard that is a two dimensional array of elements <code>E</code>.
  *
- * A keyboard consists of array of rows, and a row consists of array of elements. Each row may have
- * different number of elements. A element of a keyboard can be specified by a row number and a
- * column number, both numbers starts from 1.
+ * A keyboard consists of an array of rows, and a row consists of an array of elements. Each row
+ * may have different number of elements. A element of a keyboard can be specified by a row number
+ * and a column number, both numbers starts from 1.
  *
  * @param <E> the type of a keyboard element. A keyboard element must be an immutable object.
  */
@@ -39,8 +39,7 @@
     abstract E[][] newArrayOfArray(final int size);
 
     /**
-     * Construct a builder filled with the default element.
-     * @param dimensions the integer array of each row's size.
+     * Construct an empty builder.
      */
     AbstractKeyboardBuilder() {
         mRows = newArrayOfArray(0);
@@ -80,7 +79,7 @@
      * Get the current contents of the specified row.
      * @param row the row number to get the contents.
      * @return the array of elements at row number <code>row</code>.
-     * @throws {@link RuntimeException} if <code>row</code> is illegal.
+     * @throws RuntimeException if <code>row</code> is illegal.
      */
     E[] getRowAt(final int row) {
         final int rowIndex = row - 1;
@@ -94,7 +93,7 @@
      * Set an array of elements to the specified row.
      * @param row the row number to set <code>elements</code>.
      * @param elements the array of elements to set at row number <code>row</code>.
-     * @throws {@link RuntimeException} if <code>row</code> is illegal.
+     * @throws RuntimeException if <code>row</code> is illegal.
      */
     void setRowAt(final int row, final E[] elements) {
         final int rowIndex = row - 1;
@@ -114,7 +113,7 @@
      * @param element the element to set or insert at <code>row,column</code>.
      * @param insert if true, the <code>element</code> is inserted at <code>row,column</code>.
      *        Otherwise the <code>element</code> replace the element at <code>row,column</code>.
-     * @throws {@link RuntimeException} if <code>row</code> or <code>column</code> is illegal.
+     * @throws RuntimeException if <code>row</code> or <code>column</code> is illegal.
      */
     void setElementAt(final int row, final int column, final E element, final boolean insert) {
         final E[] elements = getRowAt(row);
diff --git a/tests/src/com/android/inputmethod/keyboard/layout/expected/AbstractLayoutBase.java b/tests/src/com/android/inputmethod/keyboard/layout/expected/AbstractLayoutBase.java
index 25be2a6..9e0039d 100644
--- a/tests/src/com/android/inputmethod/keyboard/layout/expected/AbstractLayoutBase.java
+++ b/tests/src/com/android/inputmethod/keyboard/layout/expected/AbstractLayoutBase.java
@@ -19,7 +19,6 @@
 import com.android.inputmethod.keyboard.internal.KeyboardIconsSet;
 import com.android.inputmethod.keyboard.layout.expected.ExpectedKey.ExpectedAdditionalMoreKey;
 import com.android.inputmethod.latin.Constants;
-import com.android.inputmethod.latin.utils.StringUtils;
 
 /**
  * Base class to create an expected keyboard for unit test.
diff --git a/tests/src/com/android/inputmethod/keyboard/layout/expected/ActualKeyboardBuilder.java b/tests/src/com/android/inputmethod/keyboard/layout/expected/ActualKeyboardBuilder.java
index 26d2e2a..d0fea58 100644
--- a/tests/src/com/android/inputmethod/keyboard/layout/expected/ActualKeyboardBuilder.java
+++ b/tests/src/com/android/inputmethod/keyboard/layout/expected/ActualKeyboardBuilder.java
@@ -28,6 +28,9 @@
 
 /**
  * This class builds an actual keyboard for unit test.
+ *
+ * An actual keyboard is an array of rows, and a row consists of an array of {@link Key}s.
+ * Each row may have different number of {@link Key}s.
  */
 public final class ActualKeyboardBuilder extends AbstractKeyboardBuilder<Key> {
     private static ArrayList<Key> filterOutSpacer(final List<Key> keys) {
@@ -43,7 +46,8 @@
 
     /**
      * Create the keyboard that consists of the array of rows of the actual keyboard's keys.
-     * @param sortedKeys the sorted list of keys of the actual keyboard.
+     * @param sortedKeys keys list of the actual keyboard that is sorted from top-left to
+     * bottom-right.
      * @return the actual keyboard grouped with rows.
      */
     public static Key[][] buildKeyboard(final List<Key> sortedKeys) {
diff --git a/tests/src/com/android/inputmethod/keyboard/layout/expected/ExpectedKeyboardBuilder.java b/tests/src/com/android/inputmethod/keyboard/layout/expected/ExpectedKeyboardBuilder.java
index f068ad1..e06d34d 100644
--- a/tests/src/com/android/inputmethod/keyboard/layout/expected/ExpectedKeyboardBuilder.java
+++ b/tests/src/com/android/inputmethod/keyboard/layout/expected/ExpectedKeyboardBuilder.java
@@ -24,6 +24,11 @@
 
 /**
  * This class builds an expected keyboard for unit test.
+ *
+ * An expected keyboard is an array of rows, and a row consists of an array of {@link ExpectedKey}s.
+ * Each row may have different number of {@link ExpectedKey}s. While building an expected keyboard,
+ * an {@link ExpectedKey} can be specified by a row number and a column number, both numbers starts
+ * from 1.
  */
 public final class ExpectedKeyboardBuilder extends AbstractKeyboardBuilder<ExpectedKey> {
     public ExpectedKeyboardBuilder() {
@@ -212,7 +217,7 @@
      * @param keys the array of keys to insert at <code>row,column</code>. Each key can be
      *        {@link ExpectedKey}, {@link ExpectedKey} array, and {@link String}.
      * @return this builder.
-     * @throws {@link RuntimeException} if <code>row</code> or <code>column</code> is illegal.
+     * @throws RuntimeException if <code>row</code> or <code>column</code> is illegal.
      */
     public ExpectedKeyboardBuilder insertKeysAtRow(final int row, final int column,
             final Object ... keys) {
@@ -229,7 +234,7 @@
      * @param keys the array of keys to add on the left most of the row. Each key can be
      *        {@link ExpectedKey}, {@link ExpectedKey} array, and {@link String}.
      * @return this builder.
-     * @throws {@link RuntimeException} if <code>row</code> is illegal.
+     * @throws RuntimeException if <code>row</code> is illegal.
      */
     public ExpectedKeyboardBuilder addKeysOnTheLeftOfRow(final int row,
             final Object ... keys) {
@@ -247,7 +252,7 @@
      * @param keys the array of keys to add on the right most of the row. Each key can be
      *        {@link ExpectedKey}, {@link ExpectedKey} array, and {@link String}.
      * @return this builder.
-     * @throws {@link RuntimeException} if <code>row</code> is illegal.
+     * @throws RuntimeException if <code>row</code> is illegal.
      */
     public ExpectedKeyboardBuilder addKeysOnTheRightOfRow(final int row,
             final Object ... keys) {