Computer Math Test #5

List the three non-static methods in the Bucket class:

fill(); pourInto(); spill();

Use a for loop to create the following image. Each filled circle is 20 pixels across and the first circle on the left has an upper-left corner position of 100, 50.

for (int x=100; x<=180; x+=20) g.fillOval(x, 50, 20, 20);

Use a for loop to create the following image. Each line is 50 pixels long and 5 pixels apart. The top of the first line is at 80, 50.

for (int x=80; x<=115; x+=5) g.drawLine(x, 50, x, 100);

Draw a line connecting the points 20, 40 with 120, 80.

g.drawLine(20, 40, 120, 80);

Now draw that same ellipse except use 130, 90 as its center point.

g.drawOval(105, 47, 50, 85);

Draw an ellipse at position 130, 90 with a width of 50 and height of 85.

g.drawOval(130, 90, 50, 85);

Now draw that same circle except use 50, 100 as its center point.

g.drawOval(20, 70, 60, 60);

Draw a circle at position 40, 70 (position of top-left corner of imaginary rectangle in which the circle will be placed) with a width and height of 75.

g.drawOval(40, 70, 75, 75);

Draw a circle at position 50, 100 with a width and height of 60.

g.drawOval(50, 100, 60, 60);

Draw a Square whose top-left corner is at position 200, 150, and whose sides have a length of 100.

g.drawRect(200, 150, 100, 100);

Draw a Rectangle whose top-left corner is at position 50, 75 and whose width is 100 and height is 200.

g.drawRect(50, 75, 100, 200);

Using a Graphics object g, set the color to yellow.

g.setColor(Color.yellow);

Now set the color to a brighter yellow.

g.setColor(Color.yellow.brighter());

Now set the color to a darker yellow.

g.setColor(Color.yellow.darker());

And now black.

g.setColor(new Color(0, 0, 0));

And now set the color to blue.

g.setColor(new Color(0, 0, 255));

Do the same to set the color to green.

g.setColor(new Color(0, 255, 0));

Using the Graphics object g, use the 3-arg Color constructor to set the color to red.

g.setColor(new Color(255, 0, 0));

Do the same for white.

g.setColor(new Color(255, 255, 255));

Now set the font of the Graphics object g to f1.

g.setFont(f1);

Now set the font of the Graphics object g to f2.

g.setFont(f2);

Know how to get a certain amount of gallons from buckets of two different capacities.

ok

The Bucket class also contains two private fields. the first field, totalWater, is static, the second, water, is non-static. This means that if we create three Bucket objects, then _______ copy(ies) of the static field totalWater is(are) made, while _______ copy(ies) of the instance field water is(are) made.

one and three

How many pre-defined color are there in the Color class?

13

Why is setSpeed a static method?

Because when we setSpeed, we are setting all of the Buckets, NOT JUST ONE.

List the 13 colors in the Color class:

Black, blue, cyan, darkGray, gray, green, lightGray, magenta, orange, pink, red, white, yellow

Using the Font constructor, create a Font object called f1 with name "Serif", style bold, and size of 24.

Font f1 = new Font("Serif", Font.BOLD, 24);

Using the Font constructor, create a Font object called f2 with the name "Serif", style bold and italic, and size of 14.

Font f2 = new Font("Serif", Font.BOLD|Font.ITALIC, 14);

Given the following field declaration from the Bucket class: private static int totalWater; Explain what each word means.

Private: this field can only be used by members of the Bucket class. static: one copy of totalWater. int: integer. totalWater: a variable.

Use the drawPolygon method. Show the three lines of code necessary to create a triangle whose 3 points are (150, 50), (200, 150), (100, 150).

int xPoints[] = {150, 200, 100}; int yPoints[] = {50, 150, 150}; g.drawPolygon(xPoints, yPoints, 3);

A certain class has the declarations: public int instanceField; pubic static int staticField; If you instantiate three objects from this class, How many copies of instanceField do you have? How many copies of staticField do you have?

three and one