This
class compares, orders, and sorts strings in a way appropriate for
the default locale or some other specified locale. Because it is an
abstract class, it cannot be instantiated directly. Instead, you must
use the static getInstance( ) method to obtain an
instance of a Collator subclass that is
appropriate for the default or specified locale. You can use
getAvailableLocales( ) to determine whether a
Collator object is available for a desired locale.Once an appropriate
Collator object has been obtained, you can use the
compare( ) method to compare strings. The possible
return values of this method are -1, 0, and 1, which indicate,
respectively, that the first string is collated before the second,
that the two are equivalent for collation purposes, and that the
first string is collated after the second. The equals(
) method is a convenient shortcut for testing two strings
for collation equivalence.When sorting an array of strings, each string in the array is
typically compared more than once. Using the compare(
) method in this case is inefficient. A more efficient
method for comparing strings multiple times is to use
getCollationKey( )
for each string to create CollationKey objects.
These objects can then be compared to each other more quickly than
the strings themselves can be compared.You can customize the way the
Collator object performs comparisons by calling
setStrength( ). If you pass the constant
PRIMARY to this method, the comparison looks only
at primary differences in the strings; it compares letters but
ignores accents and case differences. If you pass the constant
SECONDARY, it ignores case differences but does
not ignore accents. And if you pass TERTIARY (the
default), the Collator object takes both accents
and case differences into account in its comparison.
Figure 15-6. java.text.Collator
 public abstract class Collator implements java.util.Comparator<Object>,
Cloneable {
// Protected Constructors
protected Collator ( );
// Public Constants
public static final int CANONICAL_DECOMPOSITION ; =1
public static final int FULL_DECOMPOSITION ; =2
public static final int IDENTICAL ; =3
public static final int NO_DECOMPOSITION ; =0
public static final int PRIMARY ; =0
public static final int SECONDARY ; =1
public static final int TERTIARY ; =2
// Public Class Methods
public static java.util.Locale[ ] getAvailableLocales ( ); synchronized
public static Collator getInstance ( ); synchronized
public static Collator
getInstance (java.util.Locale desiredLocale ); synchronized
// Public Instance Methods
public abstract int compare (String source , String target );
public boolean equals (Object that ); Implements:Comparator
public boolean equals (String source , String target );
public abstract CollationKey getCollationKey (String source );
public int getDecomposition ( ); synchronized
public int getStrength ( ); synchronized
public void setDecomposition (int decompositionMode ); synchronized
public void setStrength (int newStrength ); synchronized
// Methods Implementing Comparator
1.2 public int compare (Object o1 , Object o2 );
public boolean equals (Object that );
// Public Methods Overriding Object
public Object clone ( );
public abstract int hashCode ( );
}
Subclasses
RuleBasedCollator |
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