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Java Programming: Strings and Characters

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Java Programming: Strings and Characters

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Questions and Answers

What does the length() method do when applied to a string?

Returns a substring of the string

Converts the string to uppercase

Returns the first character of the string

Returns the number of characters in the string (correct)

Which method is used to obtain a character at a specific index from a string?

trim()

charAt(index) (correct)

toUpperCase()

concat(s1)

What does the trim() method do when applied to a string?

Removes all vowels from the string

Returns a substring of the string

Reverses the characters in the string

Trims leading and trailing whitespaces from the string (correct)

How is concatenation achieved in Java with strings?

Using the concat(s1) method Signup and view all the answers

What does the toUpperCase() method do when applied to a string?

Converts all characters in the string to uppercase Signup and view all the answers

Which method returns a new string that concatenates the original string with another specified string?

concat(s1) Signup and view all the answers

Which method can be used to concatenate two strings?

concat() Signup and view all the answers

What does the `trim()` method do?

Removes all whitespace characters from the beginning and end of the string. Signup and view all the answers

How can you get the length of a string?

Using the <code>length()</code> method. Signup and view all the answers

What is the result of `"Welcome".toUpperCase()`?

WELCOME Signup and view all the answers

How can you get the first character of a string?

Using the <code>charAt(0)</code> method. Signup and view all the answers

What is the purpose of the `indexOf()` method in Java?

It returns the index of the first occurrence of the specified character or substring in the string. Signup and view all the answers

How can you convert a string to an integer in Java?

Use the <code>parseInt()</code> method of the <code>Integer</code> class. Signup and view all the answers

Which of the following is the correct way to concatenate a string with a numeric value in Java?

Append the numeric value to the string using the <code>+</code> operator. Signup and view all the answers

What is the purpose of the `substring()` method in Java?

It extracts a substring from the original string based on the specified starting and ending indices. Signup and view all the answers

What is the purpose of the `printf()` statement in Java?

It is used to format the output of a string by using format specifiers. Signup and view all the answers