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Files Unit Test
By Mickey Arnold
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Last updated almost 2 years ago
23 questions
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Question 1
1.
What is output by the code below?
Scanner s = new Scanner("aplus comp sci 212");
System.out.println( s.next() );
Question 2
2.
What is output by the code below?
Scanner s = new Scanner("aplus comp sci 212");
s.next();
System.out.println( s.next() );
Question 3
3.
What is output by the code below?
Scanner s = new Scanner("aplus comp sci 212");
s.next();
s.next();
System.out.println( s.next() );
Question 4
4.
What is output by the code below?
Scanner s = new Scanner("aplus comp sci 212");
s.next();
s.next();
s.next();
System.out.println( s.next() );
Question 5
5.
What is output by the code below?
Scanner s = new Scanner("aplus comp sci 212");
s.next();
s.next();
s.next();
s.next();
System.out.println( s.next() );
Question 6
6.
What is output by the code below?
Scanner s = new Scanner("1337 888 212 91");
s.next();
s.next();
System.out.println( s.nextInt() );
Question 7
7.
What is output by the code below?
Scanner s = new Scanner("13 8 25 9");
System.out.println( s.nextInt() + s.nextInt() );
Question 8
8.
What is output by the code below?
Scanner s = new Scanner("aplus comp sci 212");
System.out.println( s.nextInt() );
Question 9
9.
What is output by the code below?
Scanner s = new Scanner("aplus comp sci 212");
s.next();
s.next();
s.next();
System.out.println( s.nextInt() );
Question 10
10.
What is output by the code below?
Scanner s = new Scanner("aplus comp sci 212");
s.next();
s.next();
s.next();
System.out.println( s.nextInt() * 2 );
Question 11
11.
What is output by the code below?
Scanner s = new Scanner("15 20.5 99 11.5");
System.out.println( s.nextInt() );
Question 12
12.
What is output by the code below?
Scanner s = new Scanner("15 20.5 99 11.5");
s.nextInt();
System.out.println( s.nextInt() );
Question 13
13.
What is output by the code below?
Scanner s = new Scanner("15 20.5 99 11.5");
s.nextInt();
System.out.println( s.nextDouble() );
Question 14
14.
Consider the code that follows.
Scanner scan = new Scanner("4 3 2 5 1");
int sum = 0;
while(scan.hasNextInt())
{
/* code */
}
Which of the following are valid statements?
I.
System.out.println(scan.next());
II.
sum += scan.next();
III.
System.out.println(scan.nextInt());
I only
II only
I and III only
II and III only
III only
Question 15
15.
Consider the code that follows.
Scanner scan = new Scanner("4.7 3 2.4 5 1");
double sum = 0;
while( scan.hasNextDouble() )
{
/* code */
}
Which of the following are valid statements?
I.
sum += scan.next();
II.
sum += scan.nextDouble();
III.
System.out.println(scan.nextInt());
I only
II only
I and III only
II and III only
III only
Question 16
16.
Consider the code that follows.
Scanner scan = new Scanner("4.7 it at 2.4 5 1");
String sum = "";
while( scan.hasNext() )
{
/* code */
}
Which of the following are valid statements?
I.
sum += scan.next();
II.
sum += scan.nextInt();
III.
sum += scan.nextDouble();
Question 17
17.
What is output by the code below?
Scanner s = new Scanner("a 2 f q 7e 8 r 2 a");
int count = 0;
while(s.hasNext())
{
if (count % 3 == 1)
out.print(s.next() + " ");
else
s.next();
count++;
}
Question 18
18.
What is output by the code below?
Scanner s = new Scanner("a 2 f q 7e 8 r 2 a");
int count = 0;
while(s.hasNext())
{
if (count % 3 == 1)
out.print(s.next() + " ");
count++;
}
Question 19
19.
What is output by the code below?
Scanner s = new Scanner("a 2 f q 7e 8 r 2 a");
int count = 0;
while(s.hasNext())
{
if (count % 3 == 1)
count++;
s.next();
}
System.out.println(count);
Question 20
20.
What is the output by the code below using the following data file?
nums.dat
34
23
11
22
Scanner file = new Scanner(new File("nums.dat"));
System.out.println(file.nextInt()+" "+file.nextLine());
Question 21
21.
What is the output by the code below using the following data file?
nums.dat
34
23
11
22
Scanner file = new Scanner(new File("nums.dat"));
System.out.println(file.nextInt()+" "+file.next());
Question 22
22.
What is the output by the code below using the following data file?
nums.dat
3
34
23
11
22
Scanner file = new Scanner(new File("nums.dat"));
int size = file.nextInt();
for(int i=1; i < size; i++)
{
int num = file.nextInt();
out.print( num + " ");
}
Question 23
23.
What is the output by the code below using the following data file?
nums.dat
5
34
23
11
22
Scanner file = new Scanner(new File("nums.dat"));
int size = file.nextInt();
for(int i=1; i <= size; i++)
{
int num = file.nextInt();
out.print(num + " ");
}