AP CSA Unit 2: Lesson 1 Questions

Which of the following lines of code create a String variable z and set it equal to the word "Strings are String-y"?

String z = "Strings are String-y";

Consider the following code:
String a = "determined";
String b = "learner";
System.out.println(a + "-" + b);
What is the output?

determined-learner

Consider the following code:
int a = 43;
int b = 17;
System.out.println(a % b);
What is the output?

9

_____ data types can hold many pieces of information at a time.

class

Java allocates a space in memory called a(n) _____.

reference

To define an empty variable, ____ keyword can be used.

null

Which of the following would set the String variable hobby to be completely empty (i.e. not even storing a memory address)?

String hobby = null;

Which of the following are true about class data types? Click all that apply.

can hold multiple pieces of data of different types
can be created
can be customized

Consider the following code:
String a = "first";
String b = a;
a = "second";
System.out.println(a + " " + b);
What is printed when the code is run?

second first

Consider the following code:
String a = "first";
a = "second";
String b = a;
System.out.println(a + " " + b);
What is printed when the code is run?

second second