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Java String Class Methods

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Questions and Answers

What is the index of the character 'o' in the string "Hello World"?

7 (correct)

Which method is used to find the length of a string in Java?

count()

getLength()

length() (correct)

size()

How can a String object be created using a string literal in Java?

`String str = "Hello"` (correct)

`String str = new String("Hello")`

`String str = new String(Hello)`

`String str = Hello`

Which package provides the String class in Java?

java.lang (D) Signup and view all the answers

What is the difference between comparing strings using '==' and the equals() method?

Using '==' compares the references of the objects, while equals() compares the content of the strings. (A) Signup and view all the answers

What happens when two string literals with the same content are compared using '=='?

They share the same memory location. (A) Signup and view all the answers

Why is the String class considered immutable?

Because its contents cannot be changed once it is created. (A) Signup and view all the answers

What does the statement 'new String("Computer")' do in Java?

It creates a new string object with the content 'Computer' in a different memory location. (D) Signup and view all the answers

What does the method 'trim()' do when used on a string?

Returns a new string with leading and trailing whitespace removed (A) Signup and view all the answers

What does the method 'substring(1, 3)' return when used on the string 'Java'?

Returns a new string 'av' (A) Signup and view all the answers

What is the result of the method 'toUpperCase()' when used on the string 'Java'?

Returns a new string 'JAVA' (A) Signup and view all the answers

What does the method 'replace('a', 'o')' do when used on the string 'Java'?

Returns a new string with specified old character replaced by new character (A) Signup and view all the answers