Update

app/src/main/java/com/hippo/util/AssertError.java

@@ -15,9 +15,9 @@
 
 package com.hippo.util;
 
-public class NotEqualsException extends Exception {
+public class AssertError extends Error {
 
-    public NotEqualsException(String detailMessage) {
+    public AssertError(String detailMessage) {
         super(detailMessage);
     }
 }

app/src/main/java/com/hippo/util/AssertException.java

@@ -0,0 +1,23 @@
+/*
+ * Copyright (C) 2015 Hippo Seven
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.hippo.util;
+
+public class AssertException extends Exception {
+
+    public AssertException(String detailMessage) {
+        super(detailMessage);
+    }
+}

app/src/main/java/com/hippo/util/AssertUtils.java

@@ -17,22 +17,29 @@ package com.hippo.util;
 
 public class AssertUtils {
 
-    public static void assertNotNull(Object object) throws NullPointerException {
-        assertNotNull(null, object);
-    }
-
-    public static void assertNotNull(String message, Object object)
-            throws NullPointerException {
+    public static void assertNotNull(String message, Object object) {
         if (object == null) {
-            throw new NullPointerException(message);
+            throw new AssertError(message);
         }
     }
 
-    public static void assertEquals(String message, int expected, int actual)
-            throws NotEqualsException {
+    public static void assertEquals(String message, int expected, int actual) {
         if (expected != actual) {
-            throw new NotEqualsException(message);
+            throw new AssertError(message);
         }
     }
 
+    public static void assertNotNullEx(String message, Object object)
+            throws AssertException {
+        if (object == null) {
+            throw new AssertException(message);
+        }
+    }
+
+    public static void assertEqualsEx(String message, int expected, int actual)
+            throws AssertException {
+        if (expected != actual) {
+            throw new AssertException(message);
+        }
+    }
 }