assertEquals方法

/**
     * Asserts that two objects are equal. If they are not, an
     * {@link AssertionError} is thrown with the given message. If
     * <code>expected</code> and <code>actual</code> are <code>null</code>,
     * they are considered equal.
     *
     * @param message the identifying message for the {@link AssertionError} (<code>null</code>
     * okay)
     * @param expected expected value
     * @param actual actual value
     */
    static public void assertEquals(String message, Object expected,
            Object actual) {
        if (equalsRegardingNull(expected, actual)) {
            return;
        } else if (expected instanceof String && actual instanceof String) {
            String cleanMessage = message == null ? "" : message;
            throw new ComparisonFailure(cleanMessage, (String) expected,
                    (String) actual);
        } else {
            failNotEquals(message, expected, actual);
        }
    }

/**
     * Asserts that two objects are equal. If they are not, an
     * {@link AssertionError} without a message is thrown. If
     * <code>expected</code> and <code>actual</code> are <code>null</code>,
     * they are considered equal.
     *
     * @param expected expected value
     * @param actual the value to check against <code>expected</code>
     */
    static public void assertEquals(Object expected, Object actual) {
        assertEquals(null, expected, actual);
    }