New book claims sushi, wine okay for pregnant women. This publicity image released by Penguin Press shows Emily Oster, author of Expecting Better: Why the Conventional Pregnancy Wisdom Is Wrong-and What You Really Need to Know. (AP Photo/Penguin Press, Matthew Gilson) AP.
Classpath is a parameterâset either on the command-line, or through an environment variable âthat tells the Java Virtual Machine or the Java compiler where to look for user-defined classes and packages.imilar to the classic dynamic loading behavior, when executing Java programs, the Java Virtual Machine finds and loads classes lazily (it loads the bytecode of a class only when the class is first used).
The term wrapper class in Java refers to the classes that represent the primitive types in Object form. For example, the class java.lang.Integer wraps the primitive type int and java.lang.Double wraps double. These classes allow primitives to be used in places where an Object is required, for instance as a key to a Map or an element of a Collection. Before the release of JDK 1.5 you were required to convert primitive values to their equivalent wrapper class explicitly.