Comprog2

Question 1

java history

Answer 1

• created by James Gosling
• green team
• green project
• in 1991 (Sun Microsystems)
• initially called “oak” (in honor for the tree outside Gosling’s window)

Question 2

java characteristics

Answer 2

simple
object-oriented
distributed
architecture neutral
portable
high-performance
interpreted
robust
secure
multi-threaded
dynamic

Question 3

program’s source file?

Answer 3

compile-time environment

Question 4

program’s class file?

Answer 4

run-time environment

Question 5

parts of Java’s simple code

Answer 5

multi-line comment
package name
class header
main method
program body

Question 6

simple code interpretation

Answer 6

/*
*
*/
package unes;
public class Unes {
public static void main (String [ ] args) {
System.out.println(“Hi”);
}
}

Question 7

what is a variable?

Answer 7

an item of data used to store state of objects

Question 8

a variable has?

Answer 8

a data type and a name

Question 9

these are case-sensitive

Answer 9

variable names

Question 10

it may be letters, digits, dollar signs, or underscore characters

Answer 10

subsequent characters

Question 11

if the name you choose consists of only one word, spell that word in?

Answer 11

all lowercase letters

Question 12

java primitive data types

Answer 12

logical - Boolean
textual - char
integral - byte, short, int, and long
floating point - float and double

Question 13

they represent simple values that have built-in functionality in the language​

Answer 13

primitive data types

Question 14

they represent simple values such as numbers, Booleans, and characters

Answer 14

primitive data types

Question 15

name of place in memory that can contain data​

Answer 15

variable

Question 16

kind of data variable can contain

Answer 16

data type

Question 17

identifier that refers to the variable

Answer 17

name

Question 18

the default or specified value​

Answer 18

value

Question 19

also called the literal of the statement

Answer 19

value

Question 20

all Java statements end with a?

Answer 20

semicolon ;

Question 21

how to declare a variable?

Answer 21

data type name;

int grade;​
double ave1, ave2;​
boolean isVerified;​

Question 22

= is called?

Answer 22

an assignment operator

Question 23

== is called?

Answer 23

a comparative equals

Question 24

if variable is not initialized, most will default to ____. All variables should be initialized

Answer 24

null

Question 25

operators in java

Answer 25

arithmetic operators​
relational operators​
logical operators​
assignment operators​
string operator​

Question 26

used in mathematical expressions in the same way that they are used in algebra

Answer 26

arithmetic operators

Question 27

used to concatenate any number of strings, on either side of the string​

Answer 27

+ operator

Question 28

link (things) together in a chain or series​

Answer 28

concatenate

Question 29

create a code that will have an output:
I am Michelle Eunice

Answer 29

1 public class concatStr {​
2 public static void main(String[] args) {​
3 String n1 = “Michelle”;​
4 String n2 = “Eunice”;​
5 String name = n1 + “ ” + n2;​
6 System.out.println(“I am ” + name);​
7 }​
8 }​

Question 30

used to decrement/increment variable value by 1 after assigning the value to the variable​

Answer 30

post decrement/increment operator

Question 31

used to decrement/increment variable value by 1 before assigning the value to the variable

Answer 31

pre decrement/increment operator

Question 32

a character preceded by a backslash () and has a special meaning to the compiler

Answer 32

escape sequence

Question 33

insert a tab

Answer 33

\t

Question 34

insert a backspace

Answer 34

\b

Question 35

insert a newline

Answer 35

\n

Question 36

insert a carriage return

Answer 36

\r

Question 37

insert a form feed

Answer 37

\f

Question 38

insert a single quote character

Answer 38

'

Question 39

insert a double quote character

Answer 39

"

Question 40

insert a backslash character

Answer 40

\

Question 41

errors in java

Answer 41

syntax error​
run time error​
semantic error​

Question 42

also called compile time error​

Answer 42

syntax error

Question 43

these are errors where the compiler finds something wrong with your program, and you can’t even try to execute it

Answer 43

syntax error

Question 44

detected during the execution of the program

Answer 44

run time error

Question 45

occur when a program does not contain any syntax errors but asks the computer to do something that the computer is unable to reliably do

Answer 45

run time error

Question 46

also called logic error

Answer 46

semantic error

Question 47

happens when your program compiles and executes, but does the wrong thing or returns an incorrect result or no output when it should be returning an output

Answer 47

semantic error

Question 48

caused by an incorrect idea or concept used by a programmer while coding​

Answer 48

semantic error

Question 49

you must put this to help you figure out what the program is actually doing

Answer 49

print statements

Question 50

you must use this to step through your program and watch what it does

Answer 50

debugger

Question 51

it is similar to decision-making in real life

Answer 51

decision-making in programming

Question 52

uses control statements to control the flow of execution of program based on certain conditions

Answer 52

programming language

Question 53

java’s selection statements

Answer 53

if​
if-else​
if-else-if​
nested-if​
switch-case​
jump – break, continue, return​

Question 54

the most simple decision making statement. It is used to decide whether a certain statement or block of statements will be executed or not

Answer 54

if statement

Question 55

an optional companion to the if statement that can extend its usefulness

Answer 55

else statement

Question 56

a user can decide among multiple options

Answer 56

if-else-if ladder statement

Question 57

the statement executed as a result of an if statement or else clause could be another if statement

Answer 57

nested if statements​

Question 58

it does not determine which if and else matches with, it is determined by the curly brackets

Answer 58

indentation

Question 59

provides another way to decide which statement to execute next

Answer 59

switch statement​

Question 60

used as the last statement in each case’s statement list

Answer 60

break statement​

Question 61

it is a reserved word in Java

Answer 61

break

Question 62

causes control to transfer to the end of the switch statement​

Answer 62

break statement

Question 63

a switch statement can have an optional ____?

Answer 63

default case​

Question 64

it has no associated value and simply uses the reserved word default​

Answer 64

default case

Question 65

though it can be positioned anywhere in the switch statement, it is usually placed at the end​

Answer 65

default case