Topic 3 & 4 Practice - ArrayList and String Methods

Consider the following code segment.

String oldStr = "ABCDEF";

String newStr = oldStr.substring(1, 3) + oldStr.substring(4);

System.out.println(newStr);

What is printed as a result of executing the code segment?

• BCE

• BCDE

• BCEF

• BCDEF

• ABCDEF

Consider the following code segment.

ArrayList<String> items = new ArrayList<String>();

items.add("A");

items.add("B");

items.add("C");

items.add(0, "D");

items.remove(3);

items.add(0, "E");

System.out.println(items);

What is printed as a result of executing the code segment?

• [A, B, C, E]

• [A, B, D, E]

• [E, D, A, B]

• [E, D, A, C]

• [E, D, C, B]

Consider the following code segment.

String temp = "comp";

System.out.print(temp.substring(0) + " " +

temp.substring(1) + " " +

temp.substring(2) + " " +

temp.substring(3));

What is printed when the code segment is executed?

• comp

• c o m p

• comp com co c

• comp omp mp p

• comp comp comp comp

Consider the following code segment.

String str = "CompSci";

System.out.println(str.substring(0, 3));

int num = str.length();

What is the value of num when the code segment is executed?

• 3

• 4

• 5

• 6

• 7

Which code segment should go in the blank so that count is equal to the number of times "whoa" occurs in str?

• pos>0

• pos>=0

• pos<0

• pos<=0

• pos==0

int p = "Go Paw Patrol!".indexOf("p");

What is the value of p?

• 0

• 4

• 3

• -1

• This code will not compile.

Which code segment should go in the blank so that count is equal to the number of times "whoa" occurs in str?

• str.length() -2

• str.length() -4

• str.length() - 3

• str.length() - 1

• str.length()

Consider the following code segment.

ArrayList<String> students = new ArrayList<>();
students.add(“Jake”);
students.add(“Hammad”);
students.add(“Carla”);

for (int k = 0; k < students.size(); k++)
{
  System.out.print(students.set(k, "Empty") + “ “);
}

• Jake Hammad Carla

• Empty Empty Empty

• Nothing will be printed due to an error.

• Nothing will be printed, but there will be no error.

• true true true

ArrayList<String> students = new Arrayist<>();
students.add(“Jake”);
students.add(“Hammad”);
students.add(“Carla”);

for (int k = 0; k < students.size(); k++)
{
  students.set(k, “Empty”);
}

for (String str : students) {

System.out.println(students.remove(s));

}

• Jake Hammad Carla

• Empty Empty Empty

• Nothing will be printed due to an error.

• true true true

• ["baboon", "zebra", "bass", "cat", "bear", "koala"]

• ["bear", "zebra", "bass", "cat", "koala", "baboon"]

• ["baboon", "bear", "zebra", "bass", "cat", "koala"]

• ["bear", "baboon", "zebra", "bass", "cat", "koala"]

• ["zebra", "cat", "koala", "baboon", "bass", "bear"]