1. CIS 120 Problem Solving Programming Java

2. Problem Solving Problem-Solving: the process of defining a problem, searching for relevant information and resources about the problem, and of discovering, designing, and evaluating the solutions for further opportunities. Very desirable to be a good Problem Solver in any CIS discipline.

3. Polya’s – How to Solve a Problem? Understand the Problem Devise a Plan Implement the Plan Evaluate/Examine the Solution

4. Understand the Problem First. You have to understand the problem. What is the unknown? What are the data? What is the condition? Draw a figure. Introduce suitable notation.

5. Devise a Plan Review prior experience Find connections between the knows and unknowns. Simplify problem into a smaller problems Design a solution

6. Implement the Plan Carry out the plan checking the preliminary results at each step. Code A Little Test A lot

7. Evaluate/Examine the Solution Check result in alternate ways Look for new solutions Can other problems be solved using these techniques?

8. Programming Programming – the creation of an ordered set of instructions to solve a problem with a computer. Not enough to know a particular programming language… Must be able to problem solve…

9. Programming Languages Machine Languages Natural language of a particular computer Any other types of languages must be translated down to this level Assembly Languages English-like Abbreviations used for operations (Load R1, R8) High Level Languages Look of everyday English using common mathematical notation Total Cost = Price + Tax; Java, C, C++, FORTRAN, BASIC, PASCAL

10. Brief History of Java Developed by SUN Microsystems for consumer-electronic devices First widespread use was to provide dynamic web content Created by James Gosling

11. Java Environment Edit – JGRASP Compile – JAVAC (translated into bytecodes) -> class file Load – class is loaded into main memory Verify – bytecodes are verified as they are loaded into memory Execution – JAVA Interpreter interprets the bytecodes for that system.

12. Two Types of Java Programs Applications – stored and run from a local computer Applet – stored on a remote computer and executed by a Web Browser What does this say about a web browser? The Browser must support loading, verifying and interpreting the applet.