What’s the quickest way to compare strings in Java?

by

I don’t expect that Sun Oracle hasn’t already optimized the standard String#equals() to the max. So, I expect it to be already the quickest way. Peek a bit round in its source if you want to learn how they implemented it. Here’s an extract:

public boolean equals(Object anObject) {
    if (this == anObject) {
        return true;
    }
    if (anObject instanceof String) {
        String anotherString = (String)anObject;
        int n = count;
        if (n == anotherString.count) {
            char v1[] = value;
            char v2[] = anotherString.value;
            int i = offset;
            int j = anotherString.offset;
            while (n-- != 0) {
                if (v1[i++] != v2[j++])
                    return false;
            }
            return true;
        }
    }
    return false;
}

More Related Contents:

  1. Need some advice on split() method in Java [closed]
  2. StringBuilder vs String concatenation in toString() in Java
  3. How do I convert from int to String?
  4. Sort on a string that may contain a number
  5. String’s Maximum length in Java – calling length() method
  6. How to split a comma-separated string?
  7. length and length() in Java
  8. How to format a Java string with leading zero?
  9. Is String Literal Pool a collection of references to the String Object, Or a collection of Objects
  10. Convert array of strings into a string in Java
  11. Should I use string.isEmpty() or “”.equals(string)?
  12. How to insert a character in a string at a certain position?
  13. Convert seconds value to hours minutes seconds?
  14. Understanding logic in CaseInsensitiveComparator
  15. Convert String to int array in java
  16. How to shuffle characters in a string without using Collections.shuffle(…)?
  17. Closing a Scanner throws java.util.NoSuchElementException
  18. Which loop has better performance? Why?
  19. Is conversion to String using (“” + ) bad practice?
  20. Java split is eating my characters
  21. Java. Ignore accents when comparing strings
  22. Efficient way to compare version strings in Java [duplicate]
  23. How can I left-align strings using String.format()?
  24. Case insensitive matching in Java switch-case statement
  25. How many Java string objects created in the code String s=”abc”+”xyz”;?
  26. Extract all string from a java project
  27. Regular Expressions on Punctuation
  28. Can we access or query the Java String intern (constant) pool?
  29. Java printf using variable field size?
  30. Extract digits from string – StringUtils Java

Leave a Comment