Download Review Ch02-04

Summary and Test Prep: Java
Chapters 2-4 TEST
Tuesday, Oct. 9, 2012
First Java Program
Objectives Chapter 2
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Discuss why Java is an important programming
language.
Explain the Java Virtual Machine and byte code.
Choose a user interface style.
Describe the structure of a simple Java program.
Write a simple program.
Edit, compile, and run a program using a Java
development environment.
Format a program to give a pleasing, consistent
appearance.
Understand compile-time errors.
Vocabulary Chapter 2
Applet
Assignment Statement:
Byte Code:
DOS development environment:
Graphical user interface (GUI):
Hacking
Integrated Development Environment (IDE):
Java Virtual Machine (JVM):
Just-in-time Compilation (JIT):
Parameter
Source code:
Statement Terminal I\O interface:
Variable
Know the ONES in bold
Why Java: Section 2-1
Page 31 – What makes Java so special?
It is one of the fastest growing programming languages
in the world because:
1. Modern object-oriented programming
language with features from other “objectoriented” languages, for Example: C++ and
Smalltalk
2. Java is “robust,” specifically because:
a. Makes possible visus free, secure systems
b. Will NOT overwrite memory (memory
leaks caused by “pointers” not returned
to the “stack”
c. IT is PORTABLE – can run on many
different platforms
Java Virtual Machine and Byte Code Sec 2.2
Pages 32:
What is the process by which “source code” is
translated into byte code? (Read the first two
sentences under the Java Virtual Machine subheading)
SUMMARIZE below:
Sample Q:
1. What is a portable program?
2. Describe two features that make Java
better than C++:
Sample Q:
1. What does JVM stand for?
2. What is byte code? Describe how the JVM
uses byte code:
Bishop Lynch H.S. 2
Review: Chapters 2-4
Chapter 2
Objectives
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Choose a user interface style.
Describe the structure of a simple Java program.
Write a simple program.
Vocabulary Chapter 2
Choosing a User Interface Style: Section 2-3
Two choices: terminal I\O user interface or GUI
Read pages 33; But our decision is based on using the
Eclipse IDE (define IDE)
View Figure 2-1: What is going on?
GUI: User enters a number, clicks the “command button” and
something is displayed in a “label”
Hello World: Section 2-4
Pages 34 –
Program: “just a recipe” or a sequence of machine
executable instructions that the computer can
translate into machine code, using either an IDE or a
compiler, and translator (see section 2-2)
See below:
Read and Summarize and Explanation:
Page 35 – 36
In the code: Take notes
System.out.:
println:
What is a string?
What contains or surrounds the string?
What is the statement and how does it end?
What is a parameter?
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Bishop Lynch H.S. 3
Review: Chapters 2-4
Chapter 2
Edit, compile, and Execute: Section 2-5
Pages 37
Define:
Vocabulary Chapter 2
Edit,
compile,
Execute
Page 38: Development Environments:
Unix of Linux
MS Windows
(DOS development environment)
MacOS
Compile Time Errors:
Readabiltiy
Computer Ethics:
Page 41
Page 40o
2.6: Temperature Conversion:
Study “parts” of a program and revisit
source code, pages 42 – 45;
What is Scanner?
What does it meant to “instantiate
or create a Scanner object? Page 43
double fahreheit;
double celius;
What does it mean to declare a
variable?
Assignment operator, what is it’s
symbol and what does it mean?
Page 44
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Bishop Lynch H.S. 4
Review: Chapters 2-4
SAMPLE Q:
What is a variable in a program and how do you use it?
Describe the role of the assignment operator?
What is Scanner object?
Describe the difference between print and println:
Graphics NOTES (not on test)
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Bishop Lynch H.S. 5
Review: Chapters 2-4
Syntax, Errors, and Debugging
Objectives
• Construct and use numeric and string
literals.
• Name and use variables and constants.
• Create arithmetic expressions.
• Understand the precedence of different
arithmetic operators.
• Concatenate two strings or a number
and a string.
• Know how and when to use comments
in a program.
• Tell the difference between syntax
errors, run-time errors, and logic errors.
• Insert output statements to debug a
program.
Language Elements:
Pages 57 –
Contrast “natural langauges” with
programming languages:
Size, rigidity, lieteralness
Basic Java Syntax and
Semantics:
Page 59
Describe:
Data type:
Syntax:
Literals:
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Vocabulary
Arithmetic expression:
Comments
Exception
Literal
Logic Error
Origin
Package
Pseudocode
Reserved Words:
Run-Time Error:
Semantics Syntax
Virus
Screen coordinate system:
Graphics context:
Coordinate system:
Bishop Lynch H.S. 6
Review: Chapters 2-4
Literals: items in a program whose values do NOT change
Variables and Declarations:
Page 61
See Exercises 3.2:
Assignment Statements
Arithmetic Expressions
Types of Operators and Precedence
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(Types of Operands)
Bishop Lynch H.S. 7
Review: Chapters 2-4
Chapter 3: Syntax, Errors, Debugging
Maximum, Minimum, and Arithmetic
Overflow
Mixed-Mode expressions
Casting to int and double
String expressions and Methods
Escape Characters
Know list, page 69
Methods, Messages, and Signatures
Continued
Page 66
Page 66
See exampels page 67
Concatenation (joining)
“\t” or “\\” or “\n”
See page 70 – 73
Math methods:
Math.sqrt(d)
Math.abs(int)
Math.abs(double)
Math.round(double)
Math.pow(double base, double exponent)
See BluePelicanJava (pdf file)
Packages and Imports
Terminal I/O for Diff Data types, Section 3.3
See Figure 3-8
Comments:
Page 77
Case Study: Income Tax Calculator
Page 79
Programming Errors(3.5)
The Three types:
1. Syntax errors
2. Run-time errors
3. Logic errors
Page 82
Debugging: Section 3.6
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Bishop Lynch H.S. 8
Review: Chapters 2-4
Introduction to control statements: Chapter 4
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Objectives:
Use the increment and decrement operators.
Use standard math methods.
Use if and if-else statements to make choices.
Use while and for loops to repeat a process.
Construct appropriate conditions for control
statements using relational operators.
Detect and correct common errors involving
loops.
Vocabulary:
Control statements:
Counter
Count-controlled loop:
Entry-controlled loop:
Flowchart:
Infinite loop:
Iteration
Off-by-one error:
Overloading
Sentinel Task-controlled loop:
Page 105
Additional Operators, Section 4.1
Extended assignment ops:
A = A + 3; replace with A += 3;
B = B – 3; replace with B -= 3;
Increment and decrement operators:
A++
++A
B—
--B
Standard Classes and Methods:
Math Class, seven math methods
Random class
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Page 108
Bishop Lynch H.S. 9
Review: Chapters 2-4
The if and if-else statement
Section 4.4
Format:
if (boolean condition)
Statement;
// true path,
if (boolean condition)
Statement;
// true path,
else
Statement; // false path
if (boolean condition)
{
Statement;
// true path,
Statement2;
// true path
}
else
{
Statement; // false path
Statement2; // false path
Statement3; // false path
}
Set loop control variable
while (conditional expression)
Statement; // update statement
while (conditional expression)
{
Statement; // Update path
}
for (counter ;conditional expression; update)
{
Statement; // false path
}
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Page 111
Bishop Lynch H.S. 10
Review: Chapters 2-4
Complete Page 149- 151
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Bishop Lynch H.S. 11
Review: Chapters 2-4
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