arrays and strings in java

Is String a primitive data type?

• Yes

• No

• Both

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);

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)

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

(Multiple answer question)

Pick all NON-primitive datatypes from below :

• String

• int

• primitive

• Array

What is the correct relation between length and last-index of array?

• last-index is always 1 more than the length

• last-index is 1 less than the length (but not always)

• last-index is always 1 less than the length

• last-index is always equal to the length

Select correct code to create an array of "double" datatype of length 5.

• double arr = double[5];

• double{} arr = new double{5};

• double[5] arr = new double[];

• double[] arr = new double[5];

Each item in an array has a numbered position.

• True

• False

What is the difference between an array and a list?

• An array holds numbers, whereas a list holds strings
• An array can only hold data of the same data type, whereas lists can hold values of different data types
• An array holds both numbers and strings, whereas a list only holds numbers