answer 24)

3) system.out.println(math.ceil(-4.7));

options 1 and 2 will produce -5 and option 4 will not compile because the min method requires 2 parameters.
 

answer 25)

3) compile time error

the wrapper classes cannot be used like primitives.

depending on your compiler you will get an error that says someting like "error: can't convert java lang integer". wrapper classes have similar names to primitives but all start with upper case letters.

thus in this case we have int as a primitive and integer as a wrapper. the objectives do not specifically mention the wrapper classes but don't be surprised if they come up.

answer 26)

2) ic

this is a bit of a catch question. anyone with a c/c++ background would figure out that addressing in strings starts with 0 so that 1 corresponds to i in the string bicycle. the catch is that the second parameter returns the endcharacter minus 1. in this case it means instead of the "icy" being returned as intuition would expect it is only "ic".

answer 27)

3) s.indexof('v');

charat returns the letter at the position rather than searching for a letter and returning the position, mid is just to confuse the basic programmers, indexof(s,'v'); is how some future vb/j++ nightmare hybrid, might perform such a calculation.

answer 28)

1) s3=s1 + s2;

java does not allow operator overloading as in c++, but for the sake of convenience the + operator is overridden for strings.

answer 29)

4) 7

the | is known as the or operator, you could think of it as the either/or operator. turning the numbers into binary gives

4=100

3=011

for each position, if either number contains a 1 the result will contain a result in that position. as every position contains a 1 the result will be

111

which is decimal 7.