answer 35)

4) compile time error
 

the only operator overloading offered by java is the + sign for the string class. a char is a 16 bit integer and cannot be concatenated to a string with the + operator.

answer 36)

3) if(s.equalsignorecase(s2))

string comparison is case sensitive so using the equals string method will not return a match. using the==operator just compares where memory address of the references and nocasematch was just something i made up to give me a fourth slightly plausible option.

answer 37)

1) s.setbackground(color.pink);

for speakers of the more british spelt english note that there is no letter u in color. also the constants for colors are in lower case.

answer 38)

4) the file class does not support directly changing the current directory.

this seems rather surprising to me, as changing the current directory is a very common requirement. you may be able to get around this limitation by creating a new instance of the file class passing the new directory to the constructor as the path name.

answer 39)

1)with a fixed font you will see 5 characters, with a  proportional it will depend on the width of the characters

with a proportional font the letter w will occupy more space than the letter i. so if you have all wide characters you may have to scroll to the right to see the entire text of a textfield.

answer 40)

3) on the line after //two put super(10);

constructors can only be invoked from within constructors.