Java String Class Methods

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Questions and Answers

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

  • 6
  • 7 (correct)
  • 3
  • 4

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?

<p>java.lang (D)</p> Signup and view all the answers

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

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

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

<p>They share the same memory location. (A)</p> Signup and view all the answers

Why is the String class considered immutable?

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

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

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

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

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

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

<p>Returns a new string 'av' (A)</p> Signup and view all the answers

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

<p>Returns a new string 'JAVA' (A)</p> Signup and view all the answers

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

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

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