Ap Power Point Chpt2

Chapter 2: Objects and Primitive Data Presentation slides for Java Software Solutions for AP* Computer Science by John Lewis, William Loftus, and Cara Cocking Java Software Solutions is published by Addison-Wesley Presentation slides are copyright 2002 by John Lewis, William Loftus, and Cara Cocking. All rights reserved. Instructors using the textbook may use and modify these slides for pedagogical purposes. *AP is a registered trademark of The College Entrance Examination Board which was not involved in the production of, and does not endorse, this product.

Objects and Primitive Data ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Introduction to Objects ,[object Object],[object Object],[object Object],[object Object],[object Object]

Objects and Classes Bank Account A class (the concept) John’s Bank Account Balance: $5,257 An object (the realization) Bill’s Bank Account Balance: $1,245,069 Mary’s Bank Account Balance: $16,833 Multiple objects from the same class

Inheritance ,[object Object],[object Object],Bank Account Account Charge Account Savings Account Checking Account

Using Objects ,[object Object],[object Object],System.out.println ("Whatever you are, be a good one."); object method information provided to the method (parameters)

The print Method ,[object Object],[object Object],[object Object],[object Object]

Abstraction ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Character Strings ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

String Concatenation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Escape Sequences ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Escape Sequences ,[object Object],[object Object],Escape Sequence amp;quot; apos; Meaning backspace tab newline carriage return double quote single quote backslash

Variables ,[object Object],[object Object],int total; int count, temp, result; Multiple variables can be created in one declaration data type variable name

Variables ,[object Object],[object Object],[object Object],int sum = 0; int base = 32, max = 149;

Assignment ,[object Object],[object Object],total = 55; ,[object Object],[object Object],[object Object],[object Object]

Constants ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Primitive Data ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Numeric Primitive Data ,[object Object],[object Object],Type int double Storage 32 bits 64 bits Min Value -2,147,483,648 +/- 1.7 x 10 308 with 15 significant digits Max Value 2,147,483,647

Boolean ,[object Object],[object Object],[object Object],[object Object]

Characters ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Characters ,[object Object],[object Object],uppercase letters lowercase letters punctuation digits special symbols control characters A, B, C, … a, b, c, … period, semi-colon, … 0, 1, 2, … &, |, … carriage return, tab, ...

Arithmetic Expressions ,[object Object],[object Object],Addition + Subtraction - Multiplication * Division / Remainder % ,[object Object]

Division and Remainder ,[object Object],[object Object],14 / 3 equals? 8 / 12 equals? 4 0 14 % 3 equals? 8 % 12 equals? 2 8

Operator Precedence ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Operator Precedence ,[object Object],a + b + c + d + e 1 4 3 2 a + b * c - d / e 3 2 4 1 a / (b + c) - d % e 2 3 4 1 a / (b * (c + (d - e))) 4 1 2 3

Assignment Revisited ,[object Object],First the expression on the right hand side of the = operator is evaluated Then the result is stored in the variable on the left hand side answer = sum / 4 + MAX * lowest; 1 4 3 2

Assignment Revisited ,[object Object],First, one is added to the original value of count Then the result is stored back into count (overwriting the original value) count = count + 1;

Data Conversions ,[object Object],[object Object],[object Object],[object Object],[object Object]

Data Conversions ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Creating Objects ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Creating Objects ,[object Object],title = new String ("Java Software Solutions"); This calls the String constructor , which is a special method that sets up the object ,[object Object],[object Object]

Creating Objects ,[object Object],[object Object],[object Object],[object Object],[object Object]

String Methods ,[object Object],[object Object],[object Object],[object Object]

Wrapper Classes ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Class Libraries ,[object Object],[object Object],[object Object],[object Object],[object Object]

Packages ,[object Object],[object Object],Package java.lang java.applet java.awt javax.swing java.net java.util javax.xml.parsers Purpose General support Creating applets for the web Graphics and graphical user interfaces Additional graphics capabilities and components Network communication Utilities XML document processing

The import Declaration ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

The import Declaration ,[object Object],[object Object],[object Object],[object Object],[object Object]

Class Methods ,[object Object],[object Object],[object Object],[object Object]

The Keyboard Class ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Formatting Output ,[object Object],[object Object],[object Object],[object Object],[object Object]

Formatting Output ,[object Object],[object Object],[object Object],[object Object]

Applets ,[object Object],[object Object],[object Object],[object Object],[object Object]

Applets ,[object Object],[object Object],[object Object],[object Object]

The HTML applet Tag <html> <head> <title>The Einstein Applet</title> </head> <body> <applet code="Einstein.class" width=350 height=175> </applet> </body> </html>

Drawing Shapes ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Drawing a Line 10 20 150 45 X Y page.drawLine (10, 20, 150, 45); page.drawLine (150, 45, 10, 20); or

Drawing a Rectangle page.drawRect (50, 20, 100, 40); 50 20 X Y 100 40

Drawing an Oval page.drawOval (175, 20, 50, 80); 175 20 bounding rectangle X Y 50 80

The Color Class ,[object Object],[object Object],Object Color.black Color.blue Color.cyan Color.orange Color.white Color.yellow RGB Value 0, 0, 0 0, 0, 255 0, 255, 255 255, 200, 0 255, 255, 255 255, 255, 0

The Color Class ,[object Object],[object Object],[object Object],[object Object]

Summary ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

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