AP Computer Science a Quiz: Expressions And Output

public class Rectangle { private double length; private double width;

public Rectangle(double l, double w) {
    length = l;
    width = w;
}

public double getArea() {
    return length * width;
}

public double getPerimeter() {
    return 2 * (length + width);
}

public void scale(double factor) {
    length *= factor;
    width *= factor;
}

}

Consider the following code segment that uses the Rectangle class shown above:

Rectangle rect = new Rectangle(4.0, 6.0); double original = rect.getArea(); rect.scale(1.5); double scaled = rect.getArea(); System.out.println(scaled / original);

What is printed as a result of executing this code segment?

Consider the following code segment:

Math.max(Math.min(8, 12), Math.max(3, 7)) + Math.abs(-4);

What value does this expression evaluate to?

Consider the following code segment:

String word = "programming"; String result = word.substring(0, 4) + word.substring(7).toUpperCase(); System.out.println(result.length() + " " + result.charAt(result.length() - 1));

What is the output?

Consider the following code segment:

String text = "Java"; String modified = text.toLowerCase().replace('a', 'e'); System.out.println(modified.indexOf('e') + text.length());

What is printed as a result of executing this code?

public class Temperature { private double celsius;

public Temperature(double c) {
    celsius = c;
}

public double getFahrenheit() {
    return celsius * 9.0 / 5.0 + 32.0;
}

public double getCelsius() {
    return celsius;
}

public void setCelsius(double c) {
    celsius = c;
}

}

What is printed when the following code segment is executed?

Temperature temp = new Temperature(0.0); System.out.println((int)(temp.getFahrenheit())); temp.setCelsius(100.0); System.out.println((int)(temp.getFahrenheit() / 4.0));

public class Circle { private double radius;

public Circle(double r) {
    radius = r;
}

public double getArea() {
    return Math.PI * radius * radius;
}

public double getCircumference() {
    return 2 * Math.PI * radius;
}

public void setRadius(double r) {
    radius = r;
}

public double getRadius() {
    return radius;
}

}

What is printed when the following code segment is executed?

Circle c = new Circle(2.0); double ratio1 = c.getArea() / c.getCircumference(); c.setRadius(4.0); double ratio2 = c.getArea() / c.getCircumference(); System.out.println((int)(ratio2 / ratio1));

public class Counter { private int value;

public Counter() {
    value = 0;
}

public Counter(int initial) {
    value = initial;
}

public void increment() {
    value++;
}

public void decrement() {
    value--;
}

public int getValue() {
    return value;
}

public void reset() {
    value = 0;
}

}

What is the output of the following code segment?

Counter c1 = new Counter(5); Counter c2 = new Counter(); c1.decrement(); c2.increment(); int result = c1.getValue() * c2.getValue(); System.out.println(result + c1.getValue());