icegem-core/src/main/java/com/googlecode/icegem/serialization/codegen/MethodFrameCounter.java
private static String getClassNames() {
        StringBuilder result = new StringBuilder("\nMethod frame counter enter to the following classes:\n");
        for (String className : classNames.get()) {
            result.append(className).append("\n");
        }
        return result.toString();
    }
private static String getClassNames() {
        StringBuilder result = new StringBuilder("\nMethod frame counter enter to the following classes:\n");
        for (String className : classNames.get()) {
            result.append(className).append("\n");
        }
        return result.toString();
    }
Creates string with all classes that have been entered by method frame counter.
@return String