$(12$ points$)$ Give a brief answer for each of the following questions:

a$)$ What is the difference between an interpreted language and a compiled

language?

b$)$ What does JDK stand for? What does JRE stand for?

c$)$ What is the Java source filename extension, and what is the Java bytecode

filename extension?

d$)$ What is the command to compile a Java program?

e$)$ What is the command to run a Java program?

f$)$ What is the JVM$?$

g$)$ If your program needs to read integers, but the user entered strings, an error

would occur when running this program. What kind of error is this?

h$)$ Show the output of the following code:

double amount $=5$;

System.out.println$($amount $/2)$;

System.out.println$(5/2)$;

i$)$ Can the following conversions involving casting be allowed?

boolean b $=$ true;

i $=($int$)$b;

int i $=1$;

boolean b $=($boolean$)$i;

j$)$ What data types are required for a switch variable? If the keyword break is

not used after a case is processed, what is the next statement to be executed?

k$)$ What is y after the following switch statement is executed? Rewrite the code

using an if$-$else statement.

x $=3$; y $=3$;

switch $($x $+3)\{$

case $6$: y $=1$;

default: y $+=1$;

$\}$

l$)$ Why does the Math class not need to be imported?