Examples of java.util.NavigableSet

java.util.NavigableSet
A {@link SortedSet} extended with navigation methods reportingclosest matches for given search targets. Methods {@code lower}, {@code floor}, {@code ceiling}, and {@code higher} return elementsrespectively less than, less than or equal, greater than or equal, and greater than a given element, returning {@code null} if thereis no such element. A {@code NavigableSet} may be accessed andtraversed in either ascending or descending order. The {@code descendingSet} method returns a view of the set with the senses ofall relational and directional methods inverted. The performance of ascending operations and views is likely to be faster than that of descending ones. This interface additionally defines methods {@code pollFirst} and {@code pollLast} that return and remove thelowest and highest element, if one exists, else returning {@code null}. Methods {@code subSet}, {@code headSet}, and {@code tailSet} differ from the like-named {@code SortedSet} methods in accepting additional arguments describingwhether lower and upper bounds are inclusive versus exclusive. Subsets of any {@code NavigableSet} must implement the {@code NavigableSet} interface.
The return values of navigation methods may be ambiguous in implementations that permit {@code null} elements. However, evenin this case the result can be disambiguated by checking {@code contains(null)}. To avoid such issues, implementations of this interface are encouraged to not permit insertion of {@code null} elements. (Note that sorted sets of {@link Comparable} elements intrinsically do not permit {@code null}.)
Methods {@link #subSet(Object,Object) subSet(E, E)}, {@link #headSet(Object) headSet(E)}, and {@link #tailSet(Object) tailSet(E)}are specified to return {@code SortedSet} to allow existingimplementations of {@code SortedSet} to be compatibly retrofitted toimplement {@code NavigableSet}, but extensions and implementations of this interface are encouraged to override these methods to return {@code NavigableSet}.
This interface is a member of the Java Collections Framework. @author Doug Lea @author Josh Bloch @param < E> the type of elements maintained by this set @since 1.6


    public void test_DescendingSubMapEntrySet_pollLast_startIncluded_endExclued() {
        Set entrySet = navigableMap_startIncluded_endExcluded.entrySet();
        Entry entry;
        if (entrySet instanceof NavigableSet) {
            NavigableSet descendingSubMapEntrySet = ((NavigableSet) entrySet)
                    .descendingSet();
            assertEquals(9, descendingSubMapEntrySet.size());
            for (int i = 108; i > 99; i--) {
                entry = (Entry) descendingSubMapEntrySet.pollLast();
                assertEquals(i, entry.getValue());
            }
            assertNull(descendingSubMapEntrySet.pollFirst());
        }
    }

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    public void test_DescendingSubMapEntrySet_pollLast_startIncluded_endInclued() {
        Set entrySet = navigableMap_startIncluded_endIncluded.entrySet();
        Entry entry;
        if (entrySet instanceof NavigableSet) {
            NavigableSet descendingSubMapEntrySet = ((NavigableSet) entrySet)
                    .descendingSet();
            assertEquals(10, descendingSubMapEntrySet.size());
            for (int i = 109; i > 99; i--) {
                entry = (Entry) descendingSubMapEntrySet.pollLast();
                assertEquals(i, entry.getValue());
            }
            assertNull(descendingSubMapEntrySet.pollFirst());
        }
    }

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    }


    public void test_DescendingSubMapEntrySet_pollLast() {
        String key = new Integer(2).toString();
        Set entrySet = tm.headMap(key, true).entrySet();// [0...2]
        NavigableSet descendingEntrySet;
        Entry entry;


        if (entrySet instanceof NavigableSet) {
            // [2...0]
            descendingEntrySet = ((NavigableSet) entrySet).descendingSet();
            entry = (Entry) descendingEntrySet.pollLast();
            assertEquals(2, entry.getValue());
        }


        entrySet = tm.tailMap(key, true).entrySet();
        if (entrySet instanceof NavigableSet) {
            descendingEntrySet = ((NavigableSet) entrySet).descendingSet();
            entry = (Entry) descendingEntrySet.pollLast();
            assertEquals(999, entry.getValue());
        }
    }

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        }
    }


    public void test_DescendingSubMapEntrySet_descendingIterator() {
        Set entrySet;
        NavigableSet descendingSet;
        Iterator iterator;


        entrySet = navigableMap_startExcluded_endExcluded.entrySet();
        if (entrySet instanceof NavigableSet) {
            descendingSet = ((NavigableSet) entrySet).descendingSet();
            iterator = descendingSet.iterator();
            for (int value = 108; value > 100; value--) {
                assertTrue(iterator.hasNext());
                assertEquals(value, ((Entry) iterator.next()).getValue());
            }
            assertFalse(iterator.hasNext());
            try {
                iterator.next();
                fail("should throw NoSuchElementException");
            } catch (NoSuchElementException e) {
                // Expected
            }
        }


        entrySet = navigableMap_startExcluded_endIncluded.entrySet();
        if (entrySet instanceof NavigableSet) {
            descendingSet = ((NavigableSet) entrySet).descendingSet();
            iterator = descendingSet.iterator();
            for (int value = 109; value > 100; value--) {
                assertTrue(iterator.hasNext());
                assertEquals(value, ((Entry) iterator.next()).getValue());
            }
            assertFalse(iterator.hasNext());
            try {
                iterator.next();
                fail("should throw NoSuchElementException");
            } catch (NoSuchElementException e) {
                // Expected
            }
        }


        entrySet = navigableMap_startIncluded_endExcluded.entrySet();
        if (entrySet instanceof NavigableSet) {
            descendingSet = ((NavigableSet) entrySet).descendingSet();
            iterator = descendingSet.iterator();
            for (int value = 108; value > 99; value--) {
                assertTrue(iterator.hasNext());
                assertEquals(value, ((Entry) iterator.next()).getValue());
            }
            assertFalse(iterator.hasNext());
            try {
                iterator.next();
                fail("should throw NoSuchElementException");
            } catch (NoSuchElementException e) {
                // Expected
            }
        }


        entrySet = navigableMap_startIncluded_endIncluded.entrySet();
        if (entrySet instanceof NavigableSet) {
            descendingSet = ((NavigableSet) entrySet).descendingSet();
            iterator = descendingSet.iterator();
            for (int value = 109; value > 99; value--) {
                assertTrue(iterator.hasNext());
                assertEquals(value, ((Entry) iterator.next()).getValue());
            }
            assertFalse(iterator.hasNext());
            try {
                iterator.next();
                fail("should throw NoSuchElementException");
            } catch (NoSuchElementException e) {
                // Expected
            }
        }


        String endKey = new Integer(2).toString();
        entrySet = tm.headMap(endKey, true).entrySet();// 0...2
        if (entrySet instanceof NavigableSet) {
            // [2...0]
            descendingSet = ((NavigableSet) entrySet).descendingSet();
            iterator = descendingSet.descendingIterator();
            assertEquals(0, ((Entry) iterator.next()).getValue());// 0...2
        }
    }

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        }
    }


    public void test_DescendingSubMapEntrySet_headSet() {
        Set entrySet, headSet;
        NavigableSet descendingSubMapEntrySet;
        Iterator iterator, headSetIterator;
        Entry entry;
        int value;


        entrySet = navigableMap_startExcluded_endExcluded.entrySet();
        if (entrySet instanceof NavigableSet) {
            descendingSubMapEntrySet = ((NavigableSet) entrySet)
                    .descendingSet();
            iterator = descendingSubMapEntrySet.iterator();
            while (iterator.hasNext()) {
                entry = (Entry) iterator.next();
                headSet = descendingSubMapEntrySet.headSet(entry);
                headSetIterator = headSet.iterator();
                for (value = 108; headSetIterator.hasNext(); value--) {
                    assertEquals(value, ((Entry) headSetIterator.next())
                            .getValue());
                }
                try {
                    headSetIterator.next();
                    fail("should throw NoSuchElementException");
                } catch (NoSuchElementException e) {
                    // Expected
                }


                headSet = descendingSubMapEntrySet.headSet(entry, false);
                headSetIterator = headSet.iterator();
                for (value = 108; headSetIterator.hasNext(); value--) {
                    assertEquals(value, ((Entry) headSetIterator.next())
                            .getValue());
                }
                try {
                    headSetIterator.next();
                    fail("should throw NoSuchElementException");
                } catch (NoSuchElementException e) {
                    // Expected
                }


                headSet = descendingSubMapEntrySet.headSet(entry, true);
                headSetIterator = headSet.iterator();
                for (value = 108; headSetIterator.hasNext(); value--) {
                    assertEquals(value, ((Entry) headSetIterator.next())
                            .getValue());
                }
                try {
                    headSetIterator.next();
                    fail("should throw NoSuchElementException");
                } catch (NoSuchElementException e) {
                    // Expected
                }
            }
        }


        entrySet = navigableMap_startExcluded_endIncluded.entrySet();
        if (entrySet instanceof NavigableSet) {
            descendingSubMapEntrySet = ((NavigableSet) entrySet)
                    .descendingSet();
            iterator = descendingSubMapEntrySet.iterator();
            while (iterator.hasNext()) {
                entry = (Entry) iterator.next();
                headSet = descendingSubMapEntrySet.headSet(entry);
                headSetIterator = headSet.iterator();
                for (value = 109; headSetIterator.hasNext(); value--) {
                    assertEquals(value, ((Entry) headSetIterator.next())
                            .getValue());
                }
                try {
                    headSetIterator.next();
                    fail("should throw NoSuchElementException");
                } catch (NoSuchElementException e) {
                    // Expected
                }


                headSet = descendingSubMapEntrySet.headSet(entry, false);
                headSetIterator = headSet.iterator();
                for (value = 109; headSetIterator.hasNext(); value--) {
                    assertEquals(value, ((Entry) headSetIterator.next())
                            .getValue());
                }
                try {
                    headSetIterator.next();
                    fail("should throw NoSuchElementException");
                } catch (NoSuchElementException e) {
                    // Expected
                }


                headSet = descendingSubMapEntrySet.headSet(entry, true);
                headSetIterator = headSet.iterator();
                for (value = 109; headSetIterator.hasNext(); value--) {
                    assertEquals(value, ((Entry) headSetIterator.next())
                            .getValue());
                }
                try {
                    headSetIterator.next();
                    fail("should throw NoSuchElementException");
                } catch (NoSuchElementException e) {
                    // Expected
                }
            }
        }


        entrySet = navigableMap_startIncluded_endExcluded.entrySet();
        if (entrySet instanceof NavigableSet) {
            descendingSubMapEntrySet = ((NavigableSet) entrySet)
                    .descendingSet();
            iterator = descendingSubMapEntrySet.iterator();
            while (iterator.hasNext()) {
                entry = (Entry) iterator.next();
                headSet = descendingSubMapEntrySet.headSet(entry);
                headSetIterator = headSet.iterator();
                for (value = 108; headSetIterator.hasNext(); value--) {
                    assertEquals(value, ((Entry) headSetIterator.next())
                            .getValue());
                }
                try {
                    headSetIterator.next();
                    fail("should throw NoSuchElementException");
                } catch (NoSuchElementException e) {
                    // Expected
                }


                headSet = descendingSubMapEntrySet.headSet(entry, false);
                headSetIterator = headSet.iterator();
                for (value = 108; headSetIterator.hasNext(); value--) {
                    assertEquals(value, ((Entry) headSetIterator.next())
                            .getValue());
                }
                try {
                    headSetIterator.next();
                    fail("should throw NoSuchElementException");
                } catch (NoSuchElementException e) {
                    // Expected
                }


                headSet = descendingSubMapEntrySet.headSet(entry, true);
                headSetIterator = headSet.iterator();
                for (value = 108; headSetIterator.hasNext(); value--) {
                    assertEquals(value, ((Entry) headSetIterator.next())
                            .getValue());
                }
                try {
                    headSetIterator.next();
                    fail("should throw NoSuchElementException");
                } catch (NoSuchElementException e) {
                    // Expected
                }
            }
        }


        entrySet = navigableMap_startIncluded_endIncluded.entrySet();
        if (entrySet instanceof NavigableSet) {
            descendingSubMapEntrySet = ((NavigableSet) entrySet)
                    .descendingSet();
            iterator = descendingSubMapEntrySet.iterator();
            while (iterator.hasNext()) {
                entry = (Entry) iterator.next();
                headSet = descendingSubMapEntrySet.headSet(entry);
                headSetIterator = headSet.iterator();
                for (value = 109; headSetIterator.hasNext(); value--) {
                    assertEquals(value, ((Entry) headSetIterator.next())
                            .getValue());
                }
                try {
                    headSetIterator.next();
                    fail("should throw NoSuchElementException");
                } catch (NoSuchElementException e) {
                    // Expected
                }


                headSet = descendingSubMapEntrySet.headSet(entry, false);
                headSetIterator = headSet.iterator();
                for (value = 109; headSetIterator.hasNext(); value--) {
                    assertEquals(value, ((Entry) headSetIterator.next())
                            .getValue());
                }
                try {
                    headSetIterator.next();
                    fail("should throw NoSuchElementException");
                } catch (NoSuchElementException e) {
                    // Expected
                }


                headSet = descendingSubMapEntrySet.headSet(entry, true);
                headSetIterator = headSet.iterator();
                for (value = 109; headSetIterator.hasNext(); value--) {
                    assertEquals(value, ((Entry) headSetIterator.next())
                            .getValue());
                }
                try {
                    headSetIterator.next();
                    fail("should throw NoSuchElementException");
                } catch (NoSuchElementException e) {
                    // Expected
                }
            }
        }


        String endKey = new Integer(2).toString();
        entrySet = tm.headMap(endKey, true).entrySet();// 0...2
        if (entrySet instanceof NavigableSet) {
            // [2...0]
            descendingSubMapEntrySet = ((NavigableSet) entrySet)
                    .descendingSet();
            iterator = descendingSubMapEntrySet.iterator();
            iterator.next();// 2
            iterator.next();// 199
            entry = (Entry) iterator.next();// 198
            headSet = descendingSubMapEntrySet.headSet(entry);
            assertEquals(2, headSet.size());// 2 199
            headSetIterator = headSet.iterator();
            assertEquals(2, ((Entry) headSetIterator.next()).getValue());
            assertEquals(199, ((Entry) headSetIterator.next()).getValue());


            headSet = descendingSubMapEntrySet.headSet(entry, true);
            assertEquals(3, headSet.size());// 2 199
            headSetIterator = headSet.iterator();
            assertEquals(2, ((Entry) headSetIterator.next()).getValue());
            assertEquals(199, ((Entry) headSetIterator.next()).getValue());
            assertEquals(198, ((Entry) headSetIterator.next()).getValue());

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        descendingKeySet = keySet.descendingSet();
        assertNotNull(descendingKeySet.comparator());
    }


    public void test_AscendingSubMapKeySet_first() {
        NavigableSet keySet;
        String firstKey1 = new Integer(100).toString();
        String firstKey2 = new Integer(101).toString();


        keySet = navigableMap_startExcluded_endExcluded.navigableKeySet();
        assertEquals(firstKey2, keySet.first());


        keySet = navigableMap_startExcluded_endIncluded.navigableKeySet();
        assertEquals(firstKey2, keySet.first());


        keySet = navigableMap_startIncluded_endExcluded.navigableKeySet();
        assertEquals(firstKey1, keySet.first());


        keySet = navigableMap_startIncluded_endIncluded.navigableKeySet();
        assertEquals(firstKey1, keySet.first());
    }

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        keySet = navigableMap_startIncluded_endIncluded.navigableKeySet();
        assertEquals(firstKey1, keySet.first());
    }


    public void test_DescendingSubMapKeySet_pollFirst_startExcluded_endExcluded() {
        NavigableSet keySet = navigableMap_startExcluded_endExcluded
                .navigableKeySet();
        NavigableSet descendingKeySet = keySet.descendingSet();
        Iterator iterator = descendingKeySet.iterator();
        assertEquals(8, keySet.size());
        for (int value = 101; value < 109; value++) {
            assertEquals(new Integer(value).toString(), keySet.pollFirst());
        }
        assertEquals(0, keySet.size());

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        assertEquals(0, keySet.size());
        assertNull(keySet.pollLast());
    }


    public void test_DescendingSubMapKeySet_pollFirst_startExcluded_endIncluded() {
        NavigableSet keySet = navigableMap_startExcluded_endIncluded
                .navigableKeySet();
        NavigableSet descendingKeySet = keySet.descendingSet();
        Iterator iterator = descendingKeySet.iterator();
        assertEquals(9, keySet.size());
        for (int value = 101; value < 110; value++) {
            assertEquals(new Integer(value).toString(), keySet.pollFirst());
        }
        assertEquals(0, keySet.size());

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        assertEquals(0, keySet.size());
        assertNull(keySet.pollLast());
    }


    public void test_DescendingSubMapKeySet_pollFirst_startIncluded_endExcluded() {
        NavigableSet keySet = navigableMap_startIncluded_endExcluded
                .navigableKeySet();
        NavigableSet descendingKeySet = keySet.descendingSet();
        Iterator iterator = descendingKeySet.iterator();
        assertEquals(9, keySet.size());
        for (int value = 100; value < 109; value++) {
            assertEquals(new Integer(value).toString(), keySet.pollFirst());
        }
        assertEquals(0, keySet.size());

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        assertEquals(0, keySet.size());
        assertNull(keySet.pollLast());
    }


    public void test_DescendingSubMapKeySet_pollFirst_startIncluded_endIncluded() {
        NavigableSet keySet = navigableMap_startIncluded_endIncluded
                .navigableKeySet();
        NavigableSet descendingKeySet = keySet.descendingSet();
        Iterator iterator = descendingKeySet.iterator();
        assertEquals(10, keySet.size());
        for (int value = 100; value < 110; value++) {
            assertEquals(new Integer(value).toString(), keySet.pollFirst());
        }
        assertEquals(0, keySet.size());

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