Java programming multiple choice and one fill in the blank

1. What is the value of d if the user enters 123?

Scanner kybd = new Scanner(System.in); 

double d = Double.parseDouble(kybd.next());

a. 123.0

b.0.123

c. the code does not compile because 123 is an int

2. Declare the variable i correctly

String s0 = "ab"; 

String s1 = "cd"; 

_____i = s0.compareTo(s1); 

3. What is s after the following?

String s = "AbCd"; 

s.toLowerCase(); 

a. abCd 

b. ABCD 

c. AbCd 

4. Consider

String team = "Durham Bulls";

Which statement will return that character 'B'?

a. char b = team.charAt(7);

b. char b = team[8];

c.char b = team[7];

5. Which of the following statement(s) are true given the code snippet

int sophie; 

String sally; 

(multiple answers) 

a. sophie contins an integer value like 5, but sally points to an object of type string 

b. sophie contains a pointer to an integer value, sally contains a pointer to a string 

c. sophie is a variable, but sally contains an object 

d. both sally and sophie are variables 

6. Consider

String s0 = "ab"; 

String s1 = "cd"; 

What is the difference between the following

String s2 = s0 + s1; 

String s3 = s0.concat(s1);

a. none, both are "abcd"

b. s2 is "cdab" s3 is "abcd"

c. none, both are "cdab"