Java String & Math Class Review

Is String a primitive data type?

• Yes

• No

• Both

Which method to use to find length of a String?

• length()

• size()

• long()

• count()

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

• double

• String

• int

• number

String txt = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";

What is the correct way to find the length of "txt" string?

• int len = length(txt);

• float len = txt.length();

• int len = txt.length();

• double len = length(txt);

String txt = "Hello World";

System.out.println(txt.toUpperCase());

Choose the correct output.

• "HELLO WORLD"

• HELLO WORLD

• Hello world

• Hello World

Choose correct purpose of indexOf() in String class.

• returns the index (the position) of the last occurrence of a specified text in a string

• returns the character of the first occurrence of a specified character in a string

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

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

String firstName = "John ";

String lastName = "Doe";

System.out.println(firstName.concat(lastName));

Guess the output.

• John.concat(Doe)

• John Doe

• JohnDoe

• "John Doe"

String x = "10";

String y = "20";

String z = x + y;

Guess the output.

• 1020

• 10 20

• 30

• "10 20"

What will be the output of below code?

String statement = "Outfit of the day";

System.out.println(statement.Substring(3,6));

• it of

• tfit

• fit

• FIT

What is the most appropriate way to check if two Strings are equal?

• string1 == string2

• string1.equals(string2)

• string1.same(string2)

• string1.equalsIgnorecase(string2)