CODEWITHSUNDEEP
javastring
sathish_at_madison
sathish_at_madison

Reputation: 833

java.text.Collator for String comparison.,

Trying to use Collators for validating couple String objects., Here is the code.,

String myBubbleStr[] = {"zoon", "Hello", "World", "Yep", "Yow", "MyData"};
    public void testCollatorStrings() {
        Collator collator = Collator.getInstance();
        String toCompare = "yow";
        for (String collatorCompare : myBubbleStr) {
            System.out.println(collator.compare(collatorCompare, toCompare));

        }
    }

My expectation of the output is -1,-1,-1,-1,1,-1. According to the documentation.

Returns an integer value. Value is less than zero if source is less than target, value is zero if source and target are equal, value is greater than zero if source is greater than target.

But the output I get is

1 -1 -1 -1 1 -1

Can somone help, how to get about this validation., The reason am using collators is to over the unicode restrictions for String comparison. Thanks.,

Upvotes: 2

Views: 2520

Answers (1)

Sergey Kalinichenko
Sergey Kalinichenko

Reputation: 726809

The output looks correct, because collation order produced by the particular instance of Collator considers the case of the letter only for tie-breaking.

  • zoon is after yow alphabetically, so the return value should be 1
  • Hello is before yow alphabetically, so the return value should be -1
  • World is before yow alphabetically, so the return value should be -1
  • Yep is before yow alphabetically, so the return value should be -1
  • Yow is the same as yow alphabetically, but starts in a capital letter, so the return value should be 1
  • MyData is before yow alphabetically, so the return value should be -1

You can lower collator's strength to make strings that differ only in case evaluate as identical.

Upvotes: 4

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