1331

int x = 3; int y = 2; double w = x / y; What is the value held in w after the following lines of code is executed?

1.0

int s = 10; int t = 3; int u = 7; What is the System.out.println(s * t + u / s);

30

String myString = "33333"; myString.replace("3", "e"); System.out.println(myString); What is the output of the following code snippet?

33333

int x = 5; int y = 2 System.out.println(x + y * 5/3); What is the output of the following code?

8

int days = 9; int daysLeft = days--; System.outprintln(daysleft); System.put.println(days); What is the printed by the following code?

9 8

String fruit = "Banana"; System.out.println(fruit.toUpperCase()); System.out.println(fruit.substring(1,3)); What is the output of the following code snippet?

BANANA an

Scanner input = new Scanner(System.in); String dataOne = myScanner.next(); String dataTwo = myScanner.nextLine(); System.out.println(dataOne); System.out.println(dataTwo); User types in: Data one: Hi! Data two: I take CS1331!

Hi! I take CS1331

What is the math class?

It contains all static methods and constants we can use in our programs

Make a power math statement with 2^4

Math.pow(2,4)

int horsepower = 15; if (horsepower > 15) if(horsepower <= 20) System.out.println('There is a lot of horsepower"); else System.out.println("The car super fast"); What gets printer?

Nothing

What are the idea of encapsulaton?

Objects should be self governing, each object should take care of its own data

Assuming the interest has a value of 2. What is the output of the following code? if (interest > 2) System.out.println("Interest rates are greater than 2%); System.out.println("The interest rates are pretty low");

The interest rates are pretty low

True or false: Can constructors have any number of parameters?

True

Each time a method is invoked, the system stores parameters and local variables in an area of memory, known as a _________, which stores elements in a last in first out fashion.

stack

Why are visibility modifiers necessary

they can be used to selectively hide portions of the class, fulfilling the fundamental OOP concept of encapsulation

True or false: do constructors have to have the same name as the name of the class

true

String fruit1 = "Pear"; String fruit2 = "Pear"; String fruit3 = new String("Pear"); System.out.println(fruit1 == fruit2); System.out.println(fruit2 == fruit3); System.out.println(fruit2.equals(fruit3)); What is the output of the following code snippet?

true, false, true

Suppose your method does not return any value, which of the following can be used as a return type

void

List all the primitive types

double, short, char, long boolean

public class Car { public String name; public Car (string name) { this.name = name; System.out.println("name: " + name); } } public class CarDriver { public static void main(String [] args) { Car c = new Car( ); System.out.println("Cool car!"); } } What is the output and why

error because

public class Example { private int[] data; public Example(int [] values) { data = values; } public static void main(String [] args) { Example ex1 = new Example(new int []{1,2,3}); Example ex2 = new Example(ex1.data); ex1.data[0] = 9; ex2.data[1] = 6; } }

ex1 == {9,6, 3} ex2 == {9,6,3}

True or False: You always have to use this 'this' keyword inside of constructor

false

True or false: it can have a return type and value

false

int myID = 1234; myID = true; True or false: is this code legal

false

int myId = 1234; float myId = 45.7;

false

true or false; is String a primitive stype

false

Make a for loop that will execute the body of the loop 10 times

for (int i = 0; i < 10; i++){}

for (int count = 0; count < 12; count++){ System.out.println("Loops and more loops!"); } change in to for- loop

int count = 0; while (count < 12) { System.out.println("Loops and more loops!); count++ }

What is the proper way to declare and initialize an integer(whole number) called "count" that has the value 17?

int count = 17;

Which of the following are invalid identifies? myVar 9*3 a++ my_id MyID #acb

invalid identifiers

the signature of a method consists of

method name and parameter list

public class Car { public String name; public Car (string name) { name = name; } } public class CarDriver { public static void main(String [] args) { Car c = new Car("Camaro"); System.out.println(c.name); } } What is the output and why

null,

name two visibility modifiers

private and public

randomly generate an integer between 1 and 10 inclusive. The random object is called rand has already been declared and initialized

rand.nextInt(10) + 1;

What type is string

reference type

int revenue = 300; if (revenue > 50 { if (revenue < 100) { System.out.println("Revenue is greater than 50"); System.out.println("If block!); } else if (revenue > 100 { System.out.println("Revenue is greater 100") System.out.println("Else Block!"); } What gets printed?

"If block!"

int counter = 2; while (counter < 10) { counter++; } System.out.print(counter); What gets printer?

10

int s = 10; int t = 3; int u = 7; What is the System.out.println (s * (t + u) / s);

10

int s = 10; int t = 3; int u = 7; What is the System.out.println((s * t + u) / s)

3

How do you declare a variable named cold and correctly assign the value of true to it?

boolean cold = true;

System.out.print("apple"); System.out.print("banna); System.out.print("grape); System.out.print("Strawberry); What is the output of the following code snippet?

applebananagrape strawberry