AP Computer Science - Chapter 2 Review Questions with Verified Solutions

AP Computer Science - Chapter 2
Review Questions with Verified
Solutions
Which of the following data types is used to store a single character in Java?




A) `String`

B) `int`

C) `char`

D) `boolean`




✔✔ Answer: C) char




What will be the result of the following code snippet?




```java

int a = 10;

int b = 3;

int result = a / b;


1

,System.out.println(result);

```




A) `3.33`

B) `3`

C) `10`

D) `0`




✔✔ Answer: B) 3




How do you declare an `ArrayList` of `Integer` objects in Java?




A) `ArrayList<Integer> list = new ArrayList<Integer>();`

B) `ArrayList list = new ArrayList<Integer>();`

C) `ArrayList<Integer> list = new ArrayList();`

D) `ArrayList<Integer> list = new List<Integer>();`




✔✔ Answer: A) ArrayList<Integer> list = new ArrayList<Integer>();


2

,Which method is used to add an element to the end of an `ArrayList`?




A) `add()`

B) `insert()`

C) `append()`

D) `push()`




✔✔ Answer: A) add()




What does the following code snippet do?




```java

String str = "hello";

System.out.println(str.substring(1, 4));

```




A) `hell`


3

, B) `ell`

C) `he`

D) `hello`




✔✔ Answer: B) ell




Which of the following operators is used to compare two values for equality in Java?




A) `==`

B) `=`

C) `!=`

D) `===`




✔✔ Answer: A) ==




What will be the output of this code?




```java


4