JavaScript (ES6), 72 bytes - 92 removed = -20

(partially invalid?)

x=>(z=x.replace(/\s*[{}()=;]\s*/g,y=>y.trim()))+`
`+(x.length-z.length)

The output:

class Condition{public static void main(String[] args){boolean learning=true;if(learning==true){System.out.println("Java programmer");}else{System.out.println("What are you doing here?");}}

I believe the one space I could still remove is the one in (String[] args), but this would not be worth it. This is pretty much the lowest score JS can get (for this specific case, anyway).

Ruby, 63 bytes - 104 removed = -41

edit: 104 bytes that is.

$><<j=(i=$<.read).gsub(/(?<=\W)\s|\s(?=\W)/,"")
p i.size-j.size

Removes all newlines, so the printed number at the end comes on the same line too:

$ curl -s http://pastebin.com/raw.php?i=0kPdqZqZ | ruby remove_whitespace.rb 
class Condition{public static void main(String[]args){boolean learning=true;if(learning==true){System.out.println("Java programmer");}else{System.out.println("What are you doing here?");}}}104

Python, 92 bytes - 88 removed = 4

import re,sys
p=sys.stdin.read()
s=re.sub('\s+(=|{|}|(|))\s+',r'\1',p)
print len(p)-len(s),s

Test it here

Once again, regex to the rescue. There's a strange discrepancy between ideone and my python install - I'm getting 90 chars removed.

jprog.py source:

#!/usr/bin/env python

print """class Condition {
    public static void main(String[] args) {
        boolean learning = true;

        if (learning == true) {
            System.out.println("Java programmer");
        }
        else {
            System.out.println("What are you doing here?");
        }
    }
}"""

Java 8 : 79 Bytes

s->{System.out.print(s.replaceAll("(\\s+|\\n)?(\\{|\\}|=+|;)(\\s+|\\n)", "$2"));}

Regular expression with grouping can remove the extra white spaces between curly braces and equals sign used in assignment or equality check.

Regular expression is something like, (\s+|\n)?({|}|=+|;)(\s+|\n)

It will provide following output, which is valid Java program.

class Condition{public static void main(String[] args){boolean learning=true;if (learning==true){System.out.println("Java programmer");}else{System.out.println("What are you doing here?");}}}