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Questions and Answers
What should each opening HTML tag be paired with according to fully-correct HTML?
What should each opening HTML tag be paired with according to fully-correct HTML?
matching closing tag
What method can be used to check if an HTML file has matching tags?
What method can be used to check if an HTML file has matching tags?
isHTMLMatched
What should be done with opening tags when checking for matching tags?
What should be done with opening tags when checking for matching tags?
What character defines the tags in the String class method?
What character defines the tags in the String class method?
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What type of tag is recognized when it starts with a forward slash in isHTMLMatched method?
What type of tag is recognized when it starts with a forward slash in isHTMLMatched method?
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Study Notes
Problem Solving using Stack and Queue
HTML Tag Matching
- In HTML, each opening tag should pair with a matching closing tag (e.g.,
<p>with</p>,<div>with</div>, etc.) - A well-formed HTML document should have matching tags, although most browsers tolerate some mismatching tags
- The checking of whether an HTML file has matching tags can be done using a stack
Stack-based Solution
- Read the entire HTML document into a string
- Make a left-to-right pass through the string, tracking progress with an index
j - Use the
indexOfmethod to locate the>characters that define the tags - Use the
substringmethod to extract the tag contents - Push opening tags onto the stack and match them against closing tags as they are popped from the stack
- If an opening tag is found, push it onto the stack
- If a closing tag is found, check if the stack is empty or if the tag doesn't match the top of the stack; if so, return false
Method Implementation
-
public static boolean isHTMLMatched(String html)is a method that checks if an HTML document has matching tags - The method uses a stack to store the opening tags
- It returns
falseif an invalid tag is found or if there's a mismatched tag
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Description
Learn how to use stacks to check for matching HTML tags in a document. This quiz covers the basics of HTML tag structure and stack-based solution.
