International Components for Unicode
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Collation Functionalities Comparison Chart
This table lists down the differences between the collation functions provided by ICU, ICU4J and JDK.
In the case where ICU and JDK supports the same functionality, ICU has a more updated implementation that is Unicode conformant.
Legend
Public in the current release
Not public or not available in the
current release
Return to the main comparison chart.
| Functions | ICU4C 3.8 | ICU4J 3.8 | JDK 6 |
| Collation support | |||
| Extensible Collator base class | unicode/ucol.h unicode/col.h |
com.ibm.icu.text.Collator | JDK bug: java.text.CollationKey does not have a public constructor, this causes problems when implementing a subclass of a java.text.Collator |
| Primary to identical collation strength level | com.ibm.icu.text.Collator | partial support, java.text.Collator does not have Quartenary strength support | |
| French accent reordering | com.ibm.icu.text.RuleBasedCollator | java.text.RuleBasedCollator | |
| Alternate handling | com.ibm.icu.text.RuleBasedCollator | not available | |
| Numeric collation | com.ibm.icu.text.RuleBasedCollator |
not available | |
| Case first sort | com.ibm.icu.text.RuleBasedCollator | not available | |
| Case level sort | com.ibm.icu.text.RuleBasedCollator | not available | |
| Normalization support | com.ibm.icu.text.Collator | java.text.Collator | |
| Hiragana before non-ignorable quaternary sort | com.ibm.icu.text.RuleBasedCollator | not available | |
|
Localized collation Note: ICU4C/J has a faster collation implementation than java.text.Collator |
com.ibm.icu.text.Collator | java.text.Collator | |
| Rule-based collation | com.ibm.icu.text.RuleBasedCollator | java.text.RuleBasedCollator | |
| Thai reordering | com.ibm.icu.text.RuleBasedCollator | java.text.RuleBasedCollator | |
| String comparison | com.ibm.icu.text.Collator | java.text.Collator | |
|
Sortkey
generation Note: ICU4C/J generates shorter sortkeys than java.text.Collator. |
com.ibm.icu.text.Collator | java.text.Collator | |
| Sort key merge | unicode/ucol.h | com.ibm.icu.text.CollationKey | not available |
| Sort key upper/lower bound generation | com.ibm.icu.text.CollationKey | not available | |
| Collation elements iterators | unicode/ucoleitr.h unicode/coleitr.h |
com.ibm.icu.text.CollationElementIterator | java.text.CollationElementIterator |
| Language-sensitive string search | |||
| Localized string search | unicode/usearch.h unicode/search.h |
com.ibm.icu.text.SearchIterator | not available |
| Overlapping match mode | com.ibm.icu.text.SearchIterator | not available | |
| Canonical match mode | com.ibm.icu.text.StringSearch | not available | |
| Break Iterator support | com.ibm.icu.text.SearchIterator | not available | |
| Pattern search iteration | com.ibm.icu.text.StringSearch | not available | |