Chapter 10. Fundamental Classes

Exam Objectives

• Write code using the following methods of the java.lang.Math class: abs() , ceil() , floor() , max() , min() , random() , round() , sin() , cos() , tan() , sqrt() .

• Describe the significance of the immutability of String objects.

• Describe the significance of wrapper classes, including making appropriate selections in the wrapper classes to suit specified behavior requirements, stating the result of executing a fragment of code that includes an instance of one of the wrapper classes, and writing code using the following methods of the wrapper classes (e.g., Integer , Double , etc.):

  • doubleValue()

  • floatValue()

  • intValue()

  • longValue()

  • parse Xxx ()

  • get Xxx ()

  • toString()

  • toHexString()

Supplementary Objectives

• Understand the functionality inherited by all classes from the Object class, which is at the top of any class hierarchy.

• Write code for manipulating immutable and dynamic strings, using the facilities provided by the String and StringBuffer classes, respectively.