Java String and Array

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);

Which is correct method to convert String into uppercase

• changeUpperCase()

• convertUpperCase()

• toUpper()

• toUpperCase()

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 x = "10";

String y = "20";

String z = x + y;

System.out.println(z);

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

Choose most appropriate purpose of trim() method in String?

• to remove white spaces

• to get a substring of the string

• to cut String at desired index

• to remove extra white spaces from start and end of String