Examples of java.util.ListIterator

java.util.ListIterator
An iterator for lists that allows the programmer to traverse the list in either direction, modify the list during iteration, and obtain the iterator's current position in the list. A ListIterator has no current element; its cursor position always lies between the element that would be returned by a call to previous() and the element that would be returned by a call to next(). An iterator for a list of length n has n+1 possible cursor positions, as illustrated by the carets (^) below:
```
 Element(0)   Element(1)   Element(2)   ... Element(n-1) cursor positions:  ^            ^            ^            ^                  ^ 
```
Note that the {@link #remove} and {@link #set(Object)} methods arenot defined in terms of the cursor position; they are defined to operate on the last element returned by a call to {@link #next} or {@link #previous()}.
This interface is a member of the Java Collections Framework. @author Josh Bloch @version 1.28, 04/21/06 @see Collection @see List @see Iterator @see Enumeration @see List#listIterator() @since 1.2

        for (int i = 0; i < data.length; i++) {
            data[i] = new Data(i);
            list.add(data[i]);
        }


        ListIterator i;


        i = list.listIterator(5);
        i.next();
        Data d = new Data(999);
        i.set(d);
        assertEquals(d, list.get(5));
    }

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    @Test
    public void testRemoveOnlyElementInList() throws Exception {
        Data d = new Data(0);
        list.add(d);
        ListIterator i = list.listIterator();
        assertTrue(i.hasNext());
        assertEquals(d, i.next());
        i.remove();
        assertTrue(!i.hasNext());
        assertTrue(!i.hasPrevious());
        assertEquals(0, list.size());
    }

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    @Test
    public void testRemovePrevious() throws Exception {
        Data[] d = {new Data(0), new Data(1), new Data(2)};
        list.addAll(Arrays.asList(d));


        ListIterator i = list.listIterator(list.size());
        i.previous();
        i.previous();
        i.remove();
        assertEquals(2, list.size());
        assertTrue(i.hasPrevious());
        assertEquals(d[0], i.previous());
        assertTrue(!i.hasPrevious());
        assertTrue(i.hasNext());
        assertEquals(d[0], i.next());
        assertTrue(i.hasNext());
        assertEquals(d[2], i.next());
        assertTrue(!i.hasNext());
        assertTrue(i.hasPrevious());
        assertEquals(2, list.size());
    }

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    @Test
    public void testRemoveLast() throws Exception {
        Data[] d = {new Data(0), new Data(1), new Data(2)};
        list.addAll(Arrays.asList(d));


        ListIterator i = list.listIterator(list.size());
        i.previous();
        i.remove();
        assertEquals(2, list.size());
        assertTrue(i.hasPrevious());
        assertTrue(!i.hasNext());
    }

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    @Test
    public void testRemoveFirst() throws Exception {
        Data[] d = {new Data(0), new Data(1), new Data(2)};
        list.addAll(Arrays.asList(d));


        ListIterator i = list.listIterator(0);
        i.next();
        i.remove();
        assertEquals(2, list.size());
        assertTrue(!i.hasPrevious());
        assertTrue(i.hasNext());
    }

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    @Test
    public void testRemoveNext() throws Exception {
        Data[] d = {new Data(0), new Data(1), new Data(2)};
        list.addAll(Arrays.asList(d));


        ListIterator i = list.listIterator();
        assertTrue(i.hasNext());
        i.next();
        assertTrue(i.hasNext());
        assertTrue(i.hasPrevious());
        i.remove();
        assertEquals(2, list.size());
        assertTrue(!i.hasPrevious());
        assertTrue(i.hasNext());
        assertEquals(d[1], i.next());
        assertTrue(i.hasNext());
        assertEquals(d[2], i.next());
        assertTrue(i.hasPrevious());
        assertTrue(!i.hasNext());
    }

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    @Test
    public void testRemoveThrowsAfterAdd() throws Exception {
        Data d = new Data(0);
        list.add(d);
        ListIterator i = list.listIterator();
        boolean didThrow = false;


        try {
            i.remove();
        } catch (IllegalStateException e) {
            didThrow = true;
        } // end of try-catch
        assertTrue(didThrow);
    }

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    @Test
    public void testRemoveThrowsWithoutPrevious() throws Exception {
        Data d = new Data(0);
        list.add(d);
        ListIterator i = list.listIterator(list.size());
        boolean didThrow = false;


        assertTrue(i.hasPrevious());
        try {
            i.remove();
        } catch (IllegalStateException e) {
            didThrow = true;
        } // end of try-catch
        assertTrue(didThrow);
    }

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    @Test
    public void testIteratorAddFront() throws Exception {
        Data[] d = {new Data(0), new Data(1), new Data(2)};
        list.addAll(Arrays.asList(d));


        ListIterator i = list.listIterator();
        Data d1 = new Data(5);
        assertTrue(!i.hasPrevious());
        i.add(d1);
        assertTrue(i.hasPrevious());
        assertEquals(d1, i.previous());
        assertEquals(d1, i.next());
        assertEquals(d[0], i.next());
        assertEquals(d1, list.get(0));
    }

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    @Test
    public void testIteratorAddBack() throws Exception {
        Data[] d = {new Data(0), new Data(1), new Data(2)};
        list.addAll(Arrays.asList(d));


        ListIterator i = list.listIterator(list.size());
        Data d1 = new Data(5);
        assertEquals(3, list.size());
        assertTrue(i.hasPrevious());
        assertTrue(!i.hasNext());
        i.add(d1);
        assertTrue(i.hasPrevious());
        assertTrue(!i.hasNext());
        assertEquals(4, list.size());


        assertEquals(d1, i.previous());
        assertEquals(d1, i.next());
        assertEquals(d1, list.get(3));
    }

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