A Programmer[ap]s Guide to Java Certification

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()

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.