Question $3$: Email Address Extractor

Write a program that scans a text file for possible e$-$mail addresses and writes all

email address to an output file.

Addresses look like this:

someonedsomewhere, net

Notice that the address contains no spaces and has an sign followed by at least

one period $(.).$ Programs such as this scan through web pages looking for e$-$mail

addresses that become the targets of spam. Because of this, many web pages

contain disguised e$-$mail addresses that can't easily be automatically extracted.

Your program should find $12$ email addresses in the lext file emailText$-$txt$.$

Question $4$: Check Braces

A simple syntax check of java files is to count the number of open and closed

brackets. If the numbers are not the same, then a bracker is missing. Write a

program that reads a java file specified by the user and counts the number of open

brackets $(1)$ and the number of closed brackets $(1).$ It should then print out the

number of brackets missing. Use the file Athlete.java to test.

The braces in the Althlete.java fle match perfectly. So$,$ you should have equal

counts for opening and closing braces. You can then add and remove them from the

file to check if your program works as expected.

Question $5$: Header Extraction

Write a program that reads a java fle specified by the user and prints all the method

headers only to a file called headers.txt$.$ Use the file Athlete.java to test.

A method header is for example:

public void getMunber $($int if$.$

Your code should write the following headers to the file headers.txt

public class athlete f

public Athlete$($String nans, int age$)(\{$

public string gethane$()($f

public int getAge$()($

public dowble getlestThrom $()\{$

publie strine tostring$()\backslash$

private double getMininder$()($

publis vold update$($double newthrow$)($