Main Ideas For Today

• Objects and Classes
• String class
• StringBuffer Class
• Accessor methods
• Mutator methods
• Static methods
• Mutable vs. Immutable types
• String, StringBuffer, Integer, Double, Point classes
• Objects and References
• Object References as Parameters

Reading Assignment For Today

• Java by Dissection: Chapter 6, 6.1-6.2, 6.10

Review Questions For Today

Due Date: 6:00 am


• Java by Dissection: Chapter 6, Review Questions: 1, 2, 5.
• Write a Java program that:
  1. Prompts the user for the the location and dimensions of a rectangle.
  2. Creates a new instance of the Rectangle object with the specified values.
  3. Prompt the user for the x,y coordinate of a point.
  4. Print's a message indicating if the specified point is inside or outside the rectangle.
     
     HINT: See the contains method of the Rectangle class.
  
  Solutions - posted after due date.

Web Sites Related to Today's Topic

What is: an Object, a Class.

Definitions and explanations of these fundamental concepts in object oriented programming.

The Life Cycle of an Object

A series of pages on how to create and use objects (classes).



Java 2 Platform, Standard Edition, v1.2.2 - API Specification

The standard documentation of every predefined class in Java.




Rectangle Class

The documentation for the rectangle class.

String Class

JavaDoc documentation for the Java String Class with examples and explanations of all of the methods in the String class.

StringBuffer Class

In depth coverage of the Java StringBuffer Class with examples and explanations of all of the methods in the StringBuffer class.

Integer Class

JavaDoc for the Integer wrapper class for the int type.

Double Class

JavaDoc for the Double wrapper class for the double type.

Point Class

JavaDoc documentation for the Point class.

Sample Code For Today's Class

• PointDist.java - Uses Point objects to find the distance between two points.
• ObjRefs.java - Demonstrates how references and objects interact.
• Palindrome.java - Use the String and StringBuffer classes to test a string to see if it is a palindrome.