Exam 1 Review Topics

Chapter 1

· Binary numbers

· Program vs. Algorithm

Chapter 2

· Java primitive types: byte, short, int, long, double, float, char, boolean

· Java relational operators: >, <, ==, !=, <=, >=

· Arithmetic expressions

o Integer arithmetic

o Floating point arithmetic

o Operator precedence

· Casting

· Strings

· Printing using System.out.print()

· Declaring variables

· Object variables

Chapter 3

· Classes and objects

o Creating new objects via the new operator

o Class methods

§ ClassName.methodName()

§ Examples:

· Math.sqrt(3.5)

· Character.getNumericValue(‘a’)

o Object methods

§ ObjectName.methodName()

§ Examples:

· Turtle t = …;
t.setHeading(0.0);
t.turnLeft();

· String s = "Bob Roberts";
int len = s.length();
System.out.println(s.toUpperCase());

o Defining methods (we’ve done this in lab a lot!)

· Classes introduced in chapter 3

o World

o Turtle

o Picture

· Methods introduced in chapter 3

o FileChooser.pickAFile()

o Math.abs(int number)

o Picture methods

§ show() – an object method that causes a picture to show itself

o Turtle methods

§ forward(int steps) – an object method that causes a Turtle object to move forward the indicated number of steps

§ moveTo(int x, int y) – move turtle to column x, row y

§ penUp() – lift Turtle’s pen so that it doesn’t draw as it is moved

§ penDown() – set turtle’s pen down so that it will draw

§ turnLeft() – turn turtle left 90^o

§ turnRight() – turn turtle right 90^o

§ turn(int angle) – turn turtle indicated angle (positive turns clockwise, negative turns counterclockwise)

Chapter 4

· Arrays

· Looping statements

o The for-each loop

o The while loop

o The for loop

o Nested loops

· Additional picture methods

o getPixels()

o getPixel

· Using getPixels() and loops

o Pixel[] pixels = this.getPixels();
for (Pixel p : pixels)
{
/* do something with p */
}

o Pixel[] pixels = this.getPixels();
for (int index = 0; index < pixels.length; index++)
{
/* do something with pixels[index] */
}

· Using nested for loops and getPixel(x, y)

o Pixel p;
int columns = this.getWidth();
int rows = this.getHeight();
for (int row = 0; row < rows; row++)
{
for (int col = 0; col < columns; col++)
{
p = this.getPixel(row, col);
/* do something with p */
}
}

· Color objects

o Color color = new Color(200, 100, 200);

· Pixel methods

o int getRed(), setRed(int value)

o int getGreen(), setGreen(int value)

o int getBlue(), setBlue(int value)

o Color getColor(), setColor(Color color)

o int getX(), int getY()

Study tips:

· Read the chapters 1 – 4

· Try the problems at the end of each chapter

· Review the problems from lab