MidTerm

Question 1

Variable represented in

Answer 1

Unicode

Question 2

Variable Name

Answer 2

must start with a character, and can include any unicode character

Question 3

Two datatypes of Java

Answer 3

Primitive and Non-primitive

Question 4

Primitive examples

Answer 4

byte, short, long, int, float, double, boolean and char

Question 5

Non-primitive examples

Answer 5

String, Array, Classes

Question 6

byte size

Answer 6

1 byte; -2^7 to 2^7 where 7 = 8 - 1

Question 7

short size

Answer 7

2 byte; -2^15 to 2^15 where 15 = 2x8-1

Question 8

int size

Answer 8

4 byte; -2^31 to 2^31 where 31 = 4x8-1

Question 9

long size

Answer 9

8 byte; -2^(8x8-1) to 2^(8x8-1)

Question 10

char size

Answer 10

2 byte

Question 11

float

Answer 11

4 byte; 6 to 7 decimals

Question 12

double

Answer 12

8 byte; 15 decimals

Question 13

in Java, non-primitives are known as

Answer 13

reference types

Question 14

Shortcut If then else

Answer 14

exp ? true : false

Question 15

Strongly typed is

Answer 15

strict rule with data type conversion

Question 16

Statically typed

Answer 16

safe and secure; it cannot ever be bound to an object of a different type

Question 17

Dynamically typed

Answer 17

unpredictable behavior; can be assigned to objects of different type

Question 18

Strings are

Answer 18

immutable

Question 19

If you wish to have a string you can change the value of you should use

Answer 19

Stringbuffer

Question 20

If i want to concat a string together how?

Answer 20

s=s.concat(“ appended”);

Question 21

A ______ is a non-primitive data type in Java, while an _______ is an instance of a class

Answer 21

class
object

Question 22

Why a class is the blueprint or template for an object ?

Answer 22

the complete syntax for handling encapsulation, abstraction, polymorphism, and inheritance

Question 23

before compilation file extension for class

Answer 23

.java

Question 24

after compilation file extension for class

Answer 24

.class

Question 25

during execution .class file is run

Answer 25

in the JVM

Question 26

syntax for methods that return a value

Answer 26

public returnType methodName(parameters){

}

Question 27

accessing attributes outside the class definition

Answer 27

.

myBestFriend._name = “Lara”;

Question 28

Formal parameters

Answer 28

are declared in the method heading

Question 29

+ UML Class Diagram

Answer 29

public

Question 30

• UML Class Diagram

Answer 30

private

Question 31

Instance Variables

Answer 31

class variables basically

Question 32

what does a class variable hold?

Answer 32

a memory address

Question 33

what does a primitive variable hold?

Answer 33

a value

Question 34

Aliases

Answer 34

multiple class variables that have the same memory address. They point to the same object.

Question 35

Do not use _______ operator with two class variables

Answer 35

==. Use someClass.equals(otherClass);