APCSA Unit 2 Review

Front

Which data type gets returned from length() method in String class?

Back

int

Front

What is the correct way to find the length of the string "txt"? Options: int len = length(txt);, float len = txt.length();, int len = txt.length();, double len = length(txt);

Back

int len = txt.length();

Front

Choose correct purpose of indexOf() in String class.

Back

returns the index (the position) of the first occurrence of a specified text in a string (including whitespace)

Front

What is the output of the following?
String x = "10";
String y = "20";
String z = x + y;
System.out.println(z);

Back

1020

Front

What is the return type of equals() method?

Back

boolean

Front

What is the most appropriate way to check if two Strings are identical? Options: string1 == string2, string1.equals(string2), string1.same(string2), string1.equalsIgnorecase(string2)

Back

string1.equals(string2)

Front

When you try to square root a negative number in Java, what happens?

Back

It returns the value NaN

Front

Which Math class method can be used to calculate exponents? Options: Math.exponent(), Math.raise(), Math.pow(), Math.ceil()

Back

Math.pow()

Front

Which Math class method can be used to calculate square roots?

Back

Math.sqrt()

Front

What is an object?

Back

Attributes & Methods