Midterm Review

Question 1

What does // represent?

Answer 1

A comment that can continue to the end of the line

Question 2

What does /* asdfghjkl; */ represent?

Answer 2

A comment that can last multiple lines between the slashes

Question 3

What does /** asdfghjkl; */ represent?

Answer 3

A javadoc comment

Question 4

What is a syntax error?

Answer 4

A problem in the code makes a program unable to run

Question 5

What is a logical error?

Answer 5

A program runs, but does not function properly due to a logic error

Question 6

What is a run time error?

Answer 6

Something input to the code causes it to crash

Question 7

What happens when a java program is run?

Answer 7

It is converted to byte code then to machine language

Question 8

What happens when you type in a URL?

Answer 8

DNS converts it to an IP address

Question 9

What can be used in an identifyer?

Answer 9

Letters, underscores, digits, $

Question 10

What should class names always be in?

Answer 10

Title case

Question 11

What’s the difference between high level and machine level code?

Answer 11

Machine is more abstract, and high level uses human language

Question 12

What is analog like?

Answer 12

Continuous and exact

Question 13

What is digital like?

Answer 13

Finite and not exact, but cheaper

Question 14

What test simulates a human conversation?

Answer 14

Turring test

Question 15

Where does java.charAt find letters?

Answer 15

Each letter is numbered, 0 is the first letter

Question 16

What is assignment conversion?

Answer 16

Taking an int value and reassigning it as a double

Question 17

What is casting?

Answer 17

Specifying the output for something

Question 18

What is arithmetic promotion?

Answer 18

Doing math with 2 ints and storing it as a double

Question 19

What does an enumerated datatype do?

Answer 19

Store data from a small fixed set

Question 20

What class allows a primitive data to be used as an object?

Answer 20

Wrapper class

Question 21

How would you generate a random integer between 3 and 30 in Java?

Answer 21

math.nextInt(28) + 3

Question 22

What would num++ be?

Answer 22

num=num+1

Question 23

What would num+=10 be?

Answer 23

num=num+10

Question 24

What happens when you divide 2 interger values and store it in a double?

Answer 24

They will return an interger with no decimal, stored in a double. If you want said decimal, cast

Question 25

How do you find the last character of a string?

Answer 25

x.charAt(x.length()-1);

Question 26

How do you prep for the square root of a negative number in java?

Answer 26

Math.sqrt(Math.abs(x));

Question 27

What does % do?

Answer 27

Return the remainder of division as an int