AP CSA Unit 2 Review

Front

Consider the following code segment.
System.out.println("W");
System.out.println("X");
System.out.print("Y");
System.out.print("Z");
What is printed as a result of executing the code segment?

Back

W
X
YZ

Front

Consider the following code segment:
String str = "AP";
str += "CS " + 1 + 2;
System.out.println(str);
What is printed as a result of executing the code segment?

Back

APCS 12

Front

Consider the following code segment.

String one = "ABC123";
String two = "C";
String three = "3";
System.out.println(one.indexOf(two));
System.out.println(one.indexOf(three));
System.out.println(two.indexOf(one));

What is printed when the code segment is executed?

Back

2
5
-1

Front

What is printed when the following code segment is executed?
public double calculate(double x)
{
return x + 1.5;
}
Double d1 = new Double(7.5);
System.out.println(calculate(d1));

Back

9.0

Front

Consider the following code segment, which is intended to display 6.0.

double fact1 = 1 / 2;
double fact2 = 3 * 4;
double product = fact1 * fact2;
System.out.println(product);

Which of the following best describes the error, if any, in the code segment? Options:
There are no errors and the code works as intended.

Either the numerator or the denominator of the fraction 1 / 2 should be cast as double.

The expression fact1 * fact2 should be cast as double.

The expressions 1 / 2 and 3 * 4 should both be cast as double.

The variables fact1 and fact2 should both be declared as int.

Back

Either the numerator or the denominator of the fraction 1 / 2 should be cast as double.

Front

Java has 8 primitive data types, which of the following best describes the int datatype?

Back

An int can be stored with 32 bits of memory.

Front

Is the Main() method mandatory for a Java program?

Back

No, the Main() method is not mandatory for a Java program.

Front

_________ operator returns the remainder after division

Back

% operator

Front

which of the following is wrapper class in java: Float, Integer, Double, all of above?

Back

all of above

Front

What is the first index of an array?

Back

0