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20. wordList is type ListInterface<String>. What is printed? wordList.add("car"); wordList.add("boat"); wordList.add("plane"); System.out.println(wordList.replace(2, "train")); none of these...

20. wordList is type ListInterface<String>.

What is printed?

wordList.add("car");
wordList.add("boat");
wordList.add("plane"); 
System.out.println(wordList.replace(2, "train"));
none of these is correct
2
false
true
car
train
you cannot tell from the provided code
boat
plane
null

Question 21

wordList is type ListInterface<String>.

What is printed?

wordList.add("car");
wordList.add("boat");
wordList.add("plane"); 
System.out.println(wordList.replace(4, "train"));
train
plane
null
none of these is correct
car
true
false
an exception will be thrown
boat
you cannot tell from the provided code

22. wordList is type ListInterface<String>.

What is printed?

wordList.add("sun");
wordList.add("tree");
wordList.add("bird"); 
wordList.add("ocean");
System.out.println(wordList.contains("bird"));
1
an exception will be thrown
null
0
false
4
true
3
you cannot tell from the provided code
2
none of these is correct

Question 23

wordList is type ListInterface<String>.

What is printed?

wordList.add("sun");
wordList.add("tree");
wordList.add("bird"); 
wordList.add("ocean");
System.out.println(wordList.contains("snow"));
true
-1
null
you cannot tell from the provided code
0
an exception will be thrown
false
none of these is correct

Question 24

wordList is type ListInterface<String>.

What is printed?

wordList.add("car");
wordList.add("boat");
wordList.add("plane"); 
wordList.clear(); 
System.out.println(wordList.isEmpty());
3
2
0
1
you cannot tell from the provided code
an exception will be thrown
true
null
false
none of these is correct

Question 25

What is true about the code below? wordList is type ListInterface<String>.

wordList.add("sun");
wordList.add("tree");
wordList.add("bird"); 
wordList.add("ocean");
for(int i=0; i<wordList.getLength(); i++) {
     System.out.println(wordList.getEntry(i));
}
there will be a compiler error
there are no errors
there will be a runtime error (an exception thrown)

Question 26

What is true about the code below? wordList is type ListInterface<String>.

wordList.add("sun");
wordList.add("tree");
wordList.add("bird"); 
wordList.add("ocean");
for(String word : wordList) { 
     System.out.println(word);
}
there are no errors
there will be a runtime error (an exception thrown)
there will be a compiler error

Question 27

When the code completes, the list is empty. wordList is type ListInterface<String>.

wordList.add("apple");
wordList.add("banana");
wordList.add("carrot"); 
... more adds (not shown)
wordList.add("watermelon");
for(int i=1; i<=wordList.getLength(); i++) {
     wordList.remove(i);
}
True
False

Flag this Question

These next set of questions ask about objects of type List (in the Java standard library).

Refer to the API page (Links to an external site.)Links to an external site. for details.

Remember that List objects start at position 0! Carefully review the API to see how the List methods work.

Question 28

What is true about the code below? wordList is type List<String>.

wordList.add("sun");
wordList.add("tree");
wordList.add("bird"); 
wordList.add("ocean");
for(int i=0; i<wordList.size(); i++) {
     System.out.println(wordList.get(i));
}
there will be a runtime error (an exception thrown)
there are no errors
there will be a compiler error

Question 29

wordList is type List<String>.

What is printed?

wordList.add("apple");
wordList.add("banana");
wordList.add("cat"); 
wordList.add(2, "dog");
System.out.println(wordList.size());
none of these is correct
you cannot tell from the provided code
4
2
0
3
5
1

Question 30

wordList is type List<String>.

What is printed?

wordList.add("apple");
wordList.add("banana");
wordList.add("cat"); 
wordList.add(2, "dog");
System.out.println(wordList.get(3));
banana
apple
cat
you cannot tell from the provided code
null
none of these is correct
an exception will be thrown
dog

Question 31

wordList is type List<String>.

What is printed?

wordList.add("apple");
wordList.add("banana");
wordList.add("cat"); 
wordList.add("dog");
System.out.println(wordList.get(4));
apple
null
true
cat
banana
an exception will be thrown
you cannot tell from the provided code
false
dog

33. wordList is type List<String>.

What is printed?

wordList.add("house");
wordList.add("yard");
wordList.add("car"); 
wordList.add("street");
System.out.println(wordList.remove(2));
you cannot tell from the provided code
yard
false
null
none of these is correct
true
an exception will be thrown
house
street
car

Question 34

wordList is type List<String>.

What is printed?

wordList.add("house");
wordList.add("yard");
wordList.add("car"); 
wordList.add("street");
System.out.println(wordList.remove(6));
false
none of these is correct
you cannot tell from the provided code
street
car
house
null
yard
an exception will be thrown
true

Question 35

wordList is type List<String>.

What is printed?

wordList.add("car");
wordList.add("boat");
wordList.add("plane"); 
System.out.println(wordList.set(2, "train"));
2
boat
false
true
car
plane
an exception will be thrown
none of these is correct
null
you cannot tell from the provided code
train

Question 36

wordList is type List<String>.

What is printed?

wordList.add("car");
wordList.add("boat");
wordList.add("plane"); 
System.out.println(wordList.set(6, "train"));
train
none of these is correct
plane
true
car
false
boat
null
an exception will be thrown
you cannot tell from the provided code

Question 37

When the code completes, the list is empty. wordList is type List<String>.

wordList.add("apple");
wordList.add("banana");
wordList.add("carrot"); 
... more adds (not shown)
wordList.add("watermelon");
for(int i=0; i<wordList.size(); i++) {
     wordList.remove(i);
}
True
False

Question 38

What is true about the code below? wordList is type List<String>.

wordList.add("sun");
wordList.add("tree");
wordList.add("bird"); 
wordList.add("ocean");
for(String word : wordList) { 
     System.out.println(word);
}
there are no errors
there will be a runtime error (an exception thrown)
there will be a compiler error
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Homework Answers

Answer #1

Question 35

wordList is type List<String>.

What is printed?

wordList.add("car");
wordList.add("boat");
wordList.add("plane"); 
System.out.println(wordList.set(2, "train"));

Answer: none of these is correct

Explanation: The statement wordList.set(2, "train") replaces the element at the 2nd index with "train", but it does not print anything.

Question 36

wordList is type List<String>.

What is printed?

wordList.add("car");
wordList.add("boat");
wordList.add("plane"); 
System.out.println(wordList.set(6, "train"));

Answer: an exception will be thrown

Explanation: Clearly, the size of wordList is 2, and hence, setting the element at 6th index will throw an IndexOutOfBoundException.

Question 37

When the code completes, the list is empty. wordList is type List<String>.

wordList.add("apple");
wordList.add("banana");
wordList.add("carrot"); 
... more adds (not shown)
wordList.add("watermelon");
for(int i=0; i<wordList.size(); i++) {
     wordList.remove(i);
}

Answer: True

Explanation: The statement wordList.remove(i) will remove the element at index 'i' and because of the for loop, all the elements of the wordList are removed.


Question 38

What is true about the code below? wordList is type List<String>.

wordList.add("sun");
wordList.add("tree");
wordList.add("bird"); 
wordList.add("ocean");
for(String word : wordList) { 
     System.out.println(word);
}

Answer: there are no errors

Explanation: this piece of code prints all the elements of the wordList in new line.

NOTE: As per Chegg policy, I am allowed to answer only 4 questions (including sub-parts) on a single post. Kindly post the remaining questions separately and I will try to answer them. Sorry for the inconvenience caused.

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