COP2800 – Computer Programming Using JAVA University of Florida Department of CISE Spring 2013 Lecture 06 – Java Datatypes Webpage: www.cise.ufl.edu/~mssz/JavaNM/Top-Level.html.

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COP2800 – Computer Programming Using JAVA University of Florida Department of CISE Spring 2013 Lecture 06 – Java Datatypes Webpage:

COP2800 – Programming in JAVA Course Objectives – Basic Knowledge of Computers & Programming – Specific Knowledge of JAVA Programming – Practical Programming Projects Build Skills Today’s Class – Review of Java Datatypes – Datatypes For Assignment #1 float int

Review: Java Program Structure HIGH-LEVEL VIEW JAVA Units: -Packages -Classes (Instances) -Methods -Instructions -Variables PICTURE CREDIT:

Review: Java Package Structure PICTURE CREDIT:

New: Java Datatypes A datatype is a way of specifying the value of a variable x determines what actions can be performed on x sometimes varies with the programming language Java variables are statically typed – datatype must be declared before the variable can be used have datatype declarations using special words Example: byte, short, int, long, float, boolean, char, (string in the Java String class)

Java Datatypes (cont’d) An int (integer) is a 32-bit signed twos-complement integer specified by int descriptor (reserved word) Example: int i = 10; A float (single-precision floating-point number) is a positive or negative decimal number specified by float descriptor (reserved word) Example: float x = ; Usage Danger: F2C(-22.9f)

Java Datatypes (cont’d) A short (integer) is a 16-bit signed twos-complement integer specified by short descriptor (reserved word) Example: short i, j; A long (integer) is a 64-bit signed twos-complement integer specified by long descriptor (reserved word) Example: long j = L; (Java compiler would convert this number to long)

Java Datatypes (cont’d) A double (double-precision floating point number) is a 64-bit IEEE 754 format decimal number specified by double descriptor (reserved word) Example: double y = 1.4e-32; Usage Danger: function_name(-22.9e-47d) A boolean (logical value) has value true or false specified by boolean descriptor (reserved word) Example: boolean x = true;

Java Datatypes (cont’d) A char (character) is a 16-bit Unicode representation of a symbol specified by char descriptor (reserved word) Example: char c = \u0B17; char d = ‘e’ A byte (integer) is an 8-bit signed twos-complement integer specified by byte descriptor (reserved word) Example: byte k = -27;

This Week: Java Program Design Next Class (Friday) Build a Java Superclass TemperatureConverter Make a Subclass “F2C” and develop method You will Develop Class & Method for “C2F” Work on Programming Project #1, Part III Look-Ahead (Monday) Fun with Java Datatypes Programming with Datatypes & Flow Control