4

Question 1

switch (var) {
case 1://if var = 1
//What happens
break;
case 2
\://if var = 2
//What happens
break;
default://Otherwise
//What happens
break;
}

Answer 1

How do you make a Switch statement?

Question 2

for (int i; i < 10; i++) {
//Program
}

Answer 2

How do you make loops?

Question 3

In java, we have primitive types & objects.

Primitive types hold the actual value in memory.

Object hold references in memory.

Answer 3

What is a primitive type in Java?

Question 4

1. Is a - inheritance
2. Has a - composition / aggregation

V47

Answer 4

Describe 2 classes can have.

Question 5

BSILF DB CS

byte
short
int
long
float

double
boolean

char
String

Answer 5

Name 9 primitive types

Question 6

1. Almost all inheritance can be rewritten
2. Less about modeling the real world and more about modeling interactions in a system and roles and responsibilities
3. Inheritance is difficult to maintain

V52

Answer 6

Name 3 reasons why favor composition over inheritance

Question 7

x = x + 3;

Answer 7

What is this “x+=3” the equivalent of?

Question 8

=
\+=
-=
*=
/=
%=
-----------------
v20

Answer 8

What are 6 assignment operators?

Question 9

1. Treated like a primitive type (can be assigned w/o the New keyword) but it’s an object
2. They’re immutable (can’t be changed). If you give a string a different value, it create an new string in memory.

Java Fundamentals - v22

Answer 9

Name to things about strings in Java.

Question 10

System.out.println(firstName.indexOf(‘e’));

v23

Answer 10

Given: String firstName = “reynald”;

Writhe the line of code to out the index of letter ‘a’

Question 11

int[] numbers = new int[3];

Answer 11

1. Create an Array called ‘number’ w/ 3 slots

2. Write out the 2nd number

Question 12

Calls the default constructor on the Printer class.

Answer 12

What does the ‘new’ key word do here when creating an instance?

Printer myPrinter = new Printer();

Question 13

1. String[] colors = new String[] {“red”,”blue”, “Green”};
2. for (String c : colors){
   System.out.println(c);
   }

v42

Answer 13

Create an array called ‘colors’ and add to it :”red”,”blue”, “Green”

2. 1. Create a foreach loop the writes out the contents of the arra

Question 14

int ten = 10;
while(copies > ten)
{ 
System.out.println("Reynald");
copies --;
}

Answer 14

1. Define a variable that = to ten.

2. Create a while loop that prints you name tens time.

Question 15

public void printColors()
{
String[] colors = new String[] {“red”,”blue”, “green”,”yellow”};

for (String c : colors)
{
if("green".equals(c))
continue;
System.out.println(c); 
} 
}

Answer 15

Given this method below, implements ‘continue’ or ‘break’ statement if color is ‘green’

public void printColors()
{
String[] colors = new String[] {“red”,”blue”, “green”,”yellow”};

for (String c : colors)
{
System.out.println(c); 
} 
}

Question 16

Classes in OOP, are related to each other & they’re going to be related through an “IS-A” relationship or “HAS-A” relationship.

> IS-A relationship result from inheritance
HAS-A relationship result from composition

This comes from the need to reuse code.

v47

Answer 16

In OOP, describe is-a or has-relationships?

Question 17

Allows you to restrict the types that can be used in generics based on a class or interface.

v60

Answer 17

What are bounded types in Java?

Question 18

It’s useful to force code to execute whether or not an exception is thrown. It’s useful for IO operations to close files.

Answer 18

What’s the purpose of the Finally Block

Question 19

1) Checked Exception is required to be handled by compile time while Unchecked Exception doesn’t.
2) Checked Exception is direct sub-Class of Exception while Unchecked Exception are of RuntimeException.

Answer 19

What are checked & unchecked exceptions.

Question 20

Map - Look in module about collections.

Answer 20

What’s the equivalent of a dictionary in Java? Please create an example.