File name is not Parse.java -1 
(case is important: 
if your file is parse.java you get -1,
if your file is PARSE.java yop get -1 ...)

Output messages not correct -1
(message shoule be either:
"Expression parsed successfully"
or "Parse error in line" )

Program does not compile: 0

Each test case is 1 point:
test0) 5
5
Expression parsed successfully

test1) 6 * 5
6 5 *
Expression parsed successfully

test2) (6 * 5)
6 5 *
Expression parsed successfully

test3) 1 + 6 * 5
1 6 5 * +
Expression parsed successfully

test4) (1 + 6) * 5
1 6 + 5 *
Expression parsed successfully

test5) (1 + 6) - 4 * 5
1 6 + 4 5 * -
Expression parsed successfully

test6) 9 - (1 + 6) / 4 * 5
9 1 6 + 4 / 5 * -         or   9 1 6 + 4 5 * / -
Expression parsed successfully

test7) (1 + 6 * (4 - (5 / 5)))
1 6 4 5 5 / - * +
Expression parsed successfully

test8) df + g 
Parse error in line

test9)(1 + 6 * (4 - 4 (5 / 5)))
Parse error in line