Java (Multimedia Approach) Ch 1-4

1

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

1

A Java source file must have the following extension:

1

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

1

Machine language is specific to the processor in a computer.

1

The software development method is a framework used to:

1

Every program contains a particular sequence of operations referred to as

1

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

1

Java is case-sensitive.

1

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

1

An object:

1

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

1

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

1

An object reference variable:

1

A class:

1

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

1

A string literal can span multiple lines.

1

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();

1

Which of the following is a valid identifier?

1

A variable can be initialized when it is declared.

1

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

1

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

1

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;

1

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

1

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

1

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

1

Which operation occurs first when the computer executes the statement below:

int length = a - b * c % d--;

1

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

someInt = someFloat;

1

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

1

Which operation occurs first when the computer executes the statement below:

int length = a % b - c * --d;

1

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

1

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

1

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

1

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

1

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.");

1

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);
}

1

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

1

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");
}

1

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++;

}

1

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

1

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

1

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

1

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

1

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

1

What will be printed by the following loop?

for (int i = 0; i < 6; i++) {

if (i % 3 == 0) {

System.out.print(i);

}

}

1

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

1

True or False? Evaluate the following boolean condition:

num1 = 2;

num2 = 1;

bool = !(num1--==num2);

1

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

1

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?

C2 Java Programming Test sobre Java (Multimedia Approach) Ch 1-4, creado por johnrclark12 el 18/09/2014.

Java (Multimedia Approach) Ch 1-4

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.

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;

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;

Which operation occurs first when the computer executes the statement below:

int length = a % b - c * --d;

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");
}