10 Fundamental Classes

Exam Objectives

3.1 Develop code that uses the primitive wrapper classes (such as Boolean, Character, Double, Integer, etc.), and/or autoboxing & unboxing. Discuss the differences between the String, StringBuilder, and StringBuffer classes.

•For boxing and unboxing, see Section 5.1, p. 162.

Supplementary Objectives

• Understand the functionality inherited by all classes from the Object class.

• Understand the significance of immutability of String objects.

10.1 Overview of the java.lang Package

The java.lang package is indispensable when programming in Java. It is automatically imported into every source file at compile time. The package contains the Object class that is the superclass of all classes, and the ...

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