Java (Multimedia Approach) Ch 1-4

Machine language is a binary language composed of only zeros and ones

A Java source file must have the following extension:

Java bytecode varies according to the type of processor used in the computer.

Machine language is specific to the processor in a computer.

The software development method is a framework used to:

Every program contains a particular sequence of operations referred to as

True or False? A processor can execute Java bytecode directly.

Java is case-sensitive.

Which of the following is a correct way to start a Java comment?

An object:

An object of a class is also called an instance of that class.

A class has values assigned to its fields whereas an object does not.

An object reference variable:

A class:

A constructor is a special method used to create an object.

A string literal can span multiple lines.

Suppose that you have a Golfer object sally. What is the proper way of calling the swing() method for sally? The declaration is: Golfer sally = new Golfer();

Which of the following is a valid identifier?

A variable can be initialized when it is declared.

A widening conversion, in which a narrower type is converted to a wider type, takes place automatically.

Which of the following is NOT a legal identifier for a variable?

The drawString method in class Graphics2D is declared as follows: void drawString(String str, int x, int y) Assuming that some variables are declared as shown below, which calls to this method are valid? String s1 = " "; char c = 'x'; int x1 = 10, y1 = 20; double x2 = 20.5;

It is not necessary for a method to return a value.

Before using a class in the java.lang package, it is necessary to import this class into the program.

In order to read from the keyboard it is necessary to:

Which operation occurs first when the computer executes the statement below: int length = a - b * c % d--;

True or False? If someInt is an integer and someFloat is a float the following statement is a correct assignment operation. someInt = someFloat;

int GetHeight() is a method that returns the number of pixels in the column of an image.

Which operation occurs first when the computer executes the statement below: int length = a % b - c * --d;

Color myColor = new Color(255, 0, 0); will create a Color object that is

The Scanner class is part of the java.util package.

Every "if" must match up with a corresponding "else".

Which of the following is NOT a legal statement as written? Assume: double someDouble; int someInt; float someFloat; byte someByte; long someLong;

What is the output of the following code segment for an input of 45? Scanner scanner = new Scanner(System.in); int x = scanner.nextInt(); if (x > 50) System.out.print("x is greater than 50."); else if (x > 30) System.out.print("x is greater than 30."); else if (x > 40) System.out.print("x is greater than 40.");

The code below is designed so that ONLY one shape will be displayed (assume the rest of the program has been developed): if (magicShape == 0) { // magicShape is 0, draw and color a rectangle Rectangle2D.Float shape = new Rectangle2D.Float(x, y, w1, h1); dk.fill(shape); } else if (magicShape == 1) { // magicShape is 1, draw and color an ellipse Ellipse2D.Float shape1 = new Ellipse2D.Float(x, y, w1, h1); dk.fill(shape1); } else if (magicShape == 2) { // magicShape is 2, draw and color a circle Ellipse2D.Float shape2 = new Ellipse2D.Float(x, y, w2, h2); dk.fill(shape2); } else { // magicShape is 3, draw a square Rectangle2D.Float shape3 = new Rectangle2D.Float(x, y, w2, h2); dk.draw(shape3); }

It is reasonable to use the switch statement to check the value of a String object.

What is the output of the following code segment for an input of 2? System.out.print("Enter x:"); Scanner scanner = new Scanner(System.in); int x = scanner.nextInt(); switch(x) { case 1: System.out.print("1"); case 2: System.out.print("2"); case 3: System.out.print("3"); }

How many times will the loop below go through the body of the loop (assume all variables are declared appropriately)? int numTimes = 5; while (numTimes >= 0) { { // do something in the loop numTimes++; }

The do - while loop will always go through at least one iteration (as long as there is no break; statement)

True or False? Logical operators can only have boolean operands.

In the boolean expression a > b && c < d || e == f which operation will be evaluated first?

Every while loop must execute (iterate) at least one time.

The continue; statement will make execution skip to the bottom of the loop and exit the loop entirely.

What will be printed by the following loop? for (int i = 0; i < 6; i++) { if (i % 3 == 0) { System.out.print(i); } }

Which of the following is used to express the logical operation "OR"?

True or False? Evaluate the following boolean condition: num1 = 2; num2 = 1; bool = !(num1--==num2);

The break; statement is only used with the switch - case statement.

I want to print the message "uncomfortable" when the temperature is outside of the range of 60 to 80 degrees. Which condition will properly test for this situation?