Quiz # 1

Question 1

JVM – Java Virtual Machine (java.exe) does?

Answer 1

converts bytecode into machine code in real time.

Is contained in the JRE (Java Runtime Environment) along with the Java API (our library of free code like System.out.println())

Question 2

Java API is?

Answer 2

A library of java code that we can use while writing our programs

Question 3

JRE (Java Runtime Environment) is?

Answer 3

The JRE contains the JVM and the Java API

The JRE ships with virtually every computer operating system out there

Can be found in Android phones, gas station pumps, toasters, TVs, etc.

Question 4

JDK (Java Development Kit) is?

Answer 4

Only programmers need the JDK.

Contains the compiler and JRE.

The JDK contains the Compiler (javac.exe)

Question 5

Three core principles of Programming languages?

Answer 5

Sequence
Decision
Iteration

Question 6

______ translates source code to bytecode

Answer 6

Compiler translates source code to bytecode

Question 7

What is javac.exe

Answer 7

the compiler

Question 8

______ converts bytecode to machine code

Answer 8

JVM(Java virtual machine)

Question 9

_____ is the type of java code that programmers type into an editor like VSCode.

Answer 9

java source code

Question 10

____ exist on many operating systems, thus allowing java programs to be cross-platform.

Answer 10

JVM

Question 11

The first time a class is accessed, the JVM loads the bytecode from the .class file into the _____ area of memory.

Answer 11

The first time a class is accessed, the JVM loads the bytecode from the .class file into the method area of memory.

Question 12

Break down the code:

public class Test{
public static void main(String[] arg){
int a = 100;
System.out.println(a);
}
}

Answer 12

[public class] = Class header
[Test{] = Class name
[public static void main
(String[] arg) ]= Method name
{
[int a = 100;] = Declare primitive variable
[System.out.println(a);] = Print to screen
}
}

Question 13

Variables whose type starts with a lower-case letter (int, double, boolean, etc) are ________ variables

Answer 13

Variables whose type starts with a lower-case letter (int, double, boolean, etc) are PRIMITIVE variables

Question 14

_____ variables are any variables of any type that are declared inside of a method’s code block. (any method, not just the main method)

______ variables are always stored in the current stack frame of the stack, while the program is running

Answer 14

Local variables are any variables of any type that are declared inside of a method’s code block. (any method, not just the main method)

Local variables are always stored in the current stack frame of the stack, while the program is running

Question 15

The Stack is an organized area in memory where _____ ________ are created and destroyed.

Every time a method is ____, a new ______ _____ frame is created.

Answer 15

The Stack is an organized area in memory where stack frames are created and destroyed.

Every time a method is entered, a new current stack frame is created.

Question 16

Every time a method is exited, the current ____ ______ is destroyed

Answer 16

Every time a method is exited, the current stack frame is destroyed

Question 17

All local variables are stored in the current ______ _______.

Answer 17

All local variables are stored in the current stack frame.

Question 18

How do we know that a variable is local?

Answer 18

It is declared in a method

Question 19

Define these logical operators:
&&
||
!

Answer 19

&& and
|| or
! not
^ exclusive xor

Question 20

What are the 3 types of errors?

Answer 20

Compilation Error
Runtime Error
Logic Error

Question 21

int a = 19
double b = 204.34
String c = “Hello”
What are the outputs below
System.out.println(a+b+c)

System.out.println(c+a+b)

Answer 21

int a = 19
double b = 204.34
String c = “Hello”

a+b+c = 223.34Hello

c+a+b = Hello19204.34