=== 2.2.1.4 Classes ===

In general, none of the Java programming language core API classes are supported in the Java Card platform. Some classes from the **java.lang** package are supported (see [[2.2.2.4_**Class**es| Section 2.2.2.4, **Class**es]]), but none of the rest are. For example, classes that are not supported are **String**, **Thread** (and all thread-related classes), wrapper classes such as **Boolean** and **Integer**, and class **Class**. 

== System ==

Class **java.lang.System** is not supported. Java Card technology supplies a class **javacard.framework.JCSystem**, which provides an interface to system behavior.