Examples of java.util.NavigableSet.headSet()

java.util.NavigableSet.headSet()
Returns a view of the portion of this set whose elements are less than (or equal to, if {@code inclusive} is true) {@code toElement}. The returned set is backed by this set, so changes in the returned set are reflected in this set, and vice-versa. The returned set supports all optional set operations that this set supports.
The returned set will throw an {@code IllegalArgumentException}on an attempt to insert an element outside its range. @param toElement high endpoint of the returned set @param inclusive {@code true} if the high endpointis to be included in the returned view @return a view of the portion of this set whose elements are less than(or equal to, if {@code inclusive} is true) {@code toElement} @throws ClassCastException if {@code toElement} is not compatiblewith this set's comparator (or, if the set has no comparator, if {@code toElement} does not implement {@link Comparable}). Implementations may, but are not required to, throw this exception if {@code toElement} cannot be compared to elementscurrently in the set. @throws NullPointerException if {@code toElement} is null andthis set does not permit null elements @throws IllegalArgumentException if this set itself has arestricted range, and {@code toElement} lies outside thebounds of the range

        }


        endKey = new Integer(101).toString();
        assertEquals(0, keySet.headSet(endKey).size());
        assertEquals(0, keySet.headSet(endKey, false).size());
        assertEquals(1, keySet.headSet(endKey, true).size());


        for (int i = 102; i < 109; i++) {
            endKey = new Integer(i).toString();
            headSet = keySet.headSet(endKey);
            iterator = headSet.iterator();

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        assertEquals(0, keySet.headSet(endKey, false).size());
        assertEquals(1, keySet.headSet(endKey, true).size());


        for (int i = 102; i < 109; i++) {
            endKey = new Integer(i).toString();
            headSet = keySet.headSet(endKey);
            iterator = headSet.iterator();
            int j;
            for (j = 101; iterator.hasNext(); j++) {
                key = (String) iterator.next();
                assertEquals(new Integer(j).toString(), key);

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                key = (String) iterator.next();
                assertEquals(new Integer(j).toString(), key);
            }
            assertEquals(i, j);


            headSet = keySet.headSet(endKey, false);
            iterator = headSet.iterator();
            for (j = 101; iterator.hasNext(); j++) {
                key = (String) iterator.next();
                assertEquals(new Integer(j).toString(), key);
            }

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                key = (String) iterator.next();
                assertEquals(new Integer(j).toString(), key);
            }
            assertEquals(i, j);


            headSet = keySet.headSet(endKey, true);
            iterator = headSet.iterator();
            for (j = 101; iterator.hasNext(); j++) {
                key = (String) iterator.next();
                assertEquals(new Integer(j).toString(), key);
            }

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            }
            assertEquals(i + 1, j);
        }


        endKey = new Integer(109).toString();
        headSet = keySet.headSet(endKey);
        iterator = headSet.iterator();
        int index;
        for (index = 101; iterator.hasNext(); index++) {
            key = (String) iterator.next();
            assertEquals(new Integer(index).toString(), key);

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            key = (String) iterator.next();
            assertEquals(new Integer(index).toString(), key);
        }
        assertEquals(109, index);


        headSet = keySet.headSet(endKey, false);
        iterator = headSet.iterator();
        for (index = 101; iterator.hasNext(); index++) {
            key = (String) iterator.next();
            assertEquals(new Integer(index).toString(), key);
        }

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            assertEquals(new Integer(index).toString(), key);
        }
        assertEquals(109, index);


        try {
            keySet.headSet(endKey, true);
            fail("should throw IllegalArgumentException");
        } catch (IllegalArgumentException e) {
            // Expected
        }

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            // Expected
        }


        endKey = new Integer(110).toString();
        try {
            keySet.headSet(endKey);
            fail("should throw IllegalArgumentException");
        } catch (IllegalArgumentException e) {
            // Expected
        }
        try {

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            fail("should throw IllegalArgumentException");
        } catch (IllegalArgumentException e) {
            // Expected
        }
        try {
            keySet.headSet(endKey, true);
            fail("should throw IllegalArgumentException");
        } catch (IllegalArgumentException e) {
            // Expected
        }
        try {

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            fail("should throw IllegalArgumentException");
        } catch (IllegalArgumentException e) {
            // Expected
        }
        try {
            keySet.headSet(endKey, false);
            fail("should throw IllegalArgumentException");
        } catch (IllegalArgumentException e) {
            // Expected
        }

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