本文整理汇总了Java中java.util.NavigableMap.comparator方法的典型用法代码示例。如果您正苦于以下问题：Java NavigableMap.comparator方法的具体用法？Java NavigableMap.comparator怎么用？Java NavigableMap.comparator使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类java.util.NavigableMap的用法示例。
在下文中一共展示了NavigableMap.comparator方法的2个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Java代码示例。
示例1: subMap
import java.util.NavigableMap; //导入方法依赖的package包/类
/**
* Returns a view of the portion of {@code map} whose keys are contained by {@code range}.
*
* <p>This method delegates to the appropriate methods of {@link NavigableMap} (namely
* {@link NavigableMap#subMap(Object, boolean, Object, boolean) subMap()},
* {@link NavigableMap#tailMap(Object, boolean) tailMap()}, and
* {@link NavigableMap#headMap(Object, boolean) headMap()}) to actually construct the view.
* Consult these methods for a full description of the returned view's behavior.
*
* <p><b>Warning:</b> {@code Range}s always represent a range of values using the values' natural
* ordering. {@code NavigableMap} on the other hand can specify a custom ordering via a
* {@link Comparator}, which can violate the natural ordering. Using this method (or in general
* using {@code Range}) with unnaturally-ordered maps can lead to unexpected and undefined
* behavior.
*
* @since 20.0
*/
@Beta
@GwtIncompatible // NavigableMap
public static <K extends Comparable<? super K>, V> NavigableMap<K, V> subMap(
NavigableMap<K, V> map, Range<K> range) {
if (map.comparator() != null
&& map.comparator() != Ordering.natural()
&& range.hasLowerBound()
&& range.hasUpperBound()) {
checkArgument(
map.comparator().compare(range.lowerEndpoint(), range.upperEndpoint()) <= 0,
"map is using a custom comparator which is inconsistent with the natural ordering.");
}
if (range.hasLowerBound() && range.hasUpperBound()) {
return map.subMap(
range.lowerEndpoint(),
range.lowerBoundType() == BoundType.CLOSED,
range.upperEndpoint(),
range.upperBoundType() == BoundType.CLOSED);
} else if (range.hasLowerBound()) {
return map.tailMap(range.lowerEndpoint(), range.lowerBoundType() == BoundType.CLOSED);
} else if (range.hasUpperBound()) {
return map.headMap(range.upperEndpoint(), range.upperBoundType() == BoundType.CLOSED);
}
return checkNotNull(map);
}
示例2: testComparatorIsNull
import java.util.NavigableMap; //导入方法依赖的package包/类
/**
* Tests that the comparator is {@code null}.
*/
@Test(dataProvider = "NavigableMap<?,?>", dataProviderClass = EmptyNavigableMap.class)
public void testComparatorIsNull(String description, NavigableMap<?,?> navigableMap) {
Comparator comparator = navigableMap.comparator();
assertTrue(comparator == null || comparator == Collections.reverseOrder(), description + ": Comparator (" + comparator + ") is not null.");
}