Examples of java.util.TreeMap.firstKey()

java.util.TreeMap.firstKey()
@throws NoSuchElementException {@inheritDoc}

                }
            }
        }


        return matches.size() == 0
               ? null : (String) matches.get( matches.firstKey() );
    }


    /**
     * Grab lists of all root-level files and all directories
     * contained in the given archive.

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    sorter.put(getDistance(aSegment, northWest), northWest);
    sorter.put(getDistance(aSegment, southWest), southWest);
    sorter.put(getDistance(aSegment, southEast), southEast);
    sorter.put(getDistance(aSegment, northEast), northEast);


    return ((OrientedPoint) sorter.get(sorter.firstKey())).getOrientation();


  }


  private static Double getDistance(Line2D aSegment, Point aPoint) {
    double lenght1 = getLineLength(aSegment.getX1(), aSegment.getY1(), aPoint.getX(), aPoint.getY());

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                }
            }
        }


        return matches.size() == 0
            ? null : (String) matches.get(matches.firstKey());
    }


    /**
     * Grab lists of all root-level files and all directories
     * contained in the given archive.

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        assertTrue("TreeMap answered incorrect comparator", reversedTreeMap
                .comparator() == comp);
        reversedTreeMap.put(new Integer(1).toString(), new Integer(1));
        reversedTreeMap.put(new Integer(2).toString(), new Integer(2));
        assertTrue("TreeMap does not use comparator (firstKey was incorrect)",
                reversedTreeMap.firstKey().equals(new Integer(2).toString()));
        assertTrue("TreeMap does not use comparator (lastKey was incorrect)",
                reversedTreeMap.lastKey().equals(new Integer(1).toString()));


    }

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        reversedTreeMap.put(new Integer(2).toString(), new Integer(2));
        TreeMap anotherTreeMap = new TreeMap(reversedTreeMap);
        assertTrue("New tree map does not answer correct comparator",
                anotherTreeMap.comparator() == comp);
        assertTrue("TreeMap does not use comparator (firstKey was incorrect)",
                anotherTreeMap.firstKey().equals(new Integer(2).toString()));
        assertTrue("TreeMap does not use comparator (lastKey was incorrect)",
                anotherTreeMap.lastKey().equals(new Integer(1).toString()));


    }

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        assertTrue("TreeMap answered incorrect comparator", reversedTreeMap
                .comparator() == comp);
        reversedTreeMap.put(new Integer(1).toString(), new Integer(1));
        reversedTreeMap.put(new Integer(2).toString(), new Integer(2));
        assertTrue("TreeMap does not use comparator (firstKey was incorrect)",
                reversedTreeMap.firstKey().equals(new Integer(2).toString()));
        assertTrue("TreeMap does not use comparator (lastKey was incorrect)",
                reversedTreeMap.lastKey().equals(new Integer(1).toString()));
    }


    /**

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    }


    public void test_TreeMap_Constructor_Map() {
        TreeMap treeMap = new TreeMap(tm);
        assertEquals(tm.size(), treeMap.size());
        assertEquals(tm.firstKey(), treeMap.firstKey());
        assertEquals(tm.firstEntry(), treeMap.firstEntry());
        assertEquals(tm.lastKey(), treeMap.lastKey());
        assertEquals(tm.lastEntry(), treeMap.lastEntry());
        assertEquals(tm.keySet(), treeMap.keySet());

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    }


    public void test_TreeMap_Constructor_SortedMap() {
        TreeMap treeMap = new TreeMap(subMap_default);
        assertEquals(subMap_default.size(), treeMap.size());
        assertEquals(subMap_default.firstKey(), treeMap.firstKey());
        assertEquals(subMap_default.lastKey(), treeMap.lastKey());
        assertEquals(subMap_default.keySet(), treeMap.keySet());
        assertEquals(subMap_default.entrySet(), treeMap.entrySet());
    }

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        assertTrue(treeMap.isEmpty());
        assertNull(treeMap.comparator());
        assertEquals(0, treeMap.size());


        try {
            treeMap.firstKey();
            fail("should throw NoSuchElementException");
        } catch (NoSuchElementException e) {
            // Expected
        }
        assertNull(treeMap.firstEntry());

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    public void test_headMap() throws Exception {
        TreeMap tree = new TreeMap();
        tree.put(new Integer(0), null);
        tree.put(new Integer(1), null);
        Map submap = tree.subMap(tree.firstKey(), tree.lastKey());
        tree.remove(tree.lastKey());
        assertEquals(submap, tree);
    }


    public void testname() throws Exception {

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