CSC 206 Practice quiz

s.toUpperCase()

HELLO

s.length()

4

s.trim()

space

s.charAt(3)

e

s.substring(1, 4)

ppl

s.indexOf("u")

4

s.equals("Data")

false

s.concat("ny")

funny

(s == t) ? 0 : 1

0

Quadrilateral q = new Quadrilateral(4, 5, 4, 5); q.display()

Side1: 4.0 Side2: 5.0 Side3: 4.0 Side4: 5.0 // Perimeter: 18.0

Rectangle r = new Rectangle(3, 6); r.display()

This is a rectangle. // Length: 3.0 Width: 6.0 // Perimeter: 18.0

Square s = new Square(5); s.display()

This is a square. // Side: 5.0 // Perimeter: 20.0

Quadrilateral q = new Square(4); q.display()

This is a square. // Side: 4.0 // Perimeter: 16.0

Animal a = new Dog(); a.makeSound()

Dog goes woof

Animal a = new Cat(); a.makeSound()

Cat goes meows

Animal a = new Fox(); a.makeSound()

Fox says ring-ding-ding-ding-dingeringeding!

try { int x = Integer.parseInt("abc"); } catch (NumberFormatException e) { System.out.println("Invalid number!"); }

Invalid number!

Animal[] animals = {new Dog(), new Cat(), new Fox()}; for (Animal a : animals) { a.makeSound(); }

Dog goes woof // Cat goes meows // Fox says ring-ding-ding-ding-dingeringeding!

ArrayList list = new ArrayList<>(); list.add("red"); list.add("blue"); System.out.println(list.get(1));

blue

Circle c = new Circle(7); System.out.printf("Area: %.2f\n", c.getArea());

Area: 153.94

"Hi".toUpperCase()

HI

"Data".equals("data")

false

" A ".trim()

A

new Rectangle(3, 4).display()

12

new Fox().makeSound()

Ring

Integer.parseInt("abc") inside try/catch

Invalid

list.get(0) after adding "one"

red

Circle c = new Circle(1) getArea?

3

q.display() for Quadrilateral

Side1: 4.0 Side2: 5.0 Side3: 4.0 Side4: 5.0

Perimeter: 18.0

r.display() for Rectangle

This is a rectangle. // Length: 3.0 Width: 6.0

Perimeter: 18.0

s.display() for Square

This is a square. // Side: 5.0

Perimeter: 20.0

q.display() for Square

This is a square. // Side: 4.0

Perimeter: 16.0

a.makeSound() for Dog

Dog goes woof

a.makeSound() for Cat

Cat goes meows

a.makeSound() for Fox

Fox says ring-ding-ding-ding-dingeringeding!

Integer.parseInt("abc") inside try/catch

Invalid number!

for (Animal a : animals)

Dog goes woof

Cat goes meows

Fox says ring-ding-ding-ding-dingeringeding!

list.get(1)

blue

c.getArea() for Circle

Area: 153.94

list.get(0) after adding "one"

blue

Circle c = new Circle(1) getArea?

Area: 3.14