Examples of java.util.ListIterator.previousIndex()

java.util.ListIterator.previousIndex()
Returns the index of the element that would be returned by a subsequent call to previous. (Returns -1 if the list iterator is at the beginning of the list.) @return the index of the element that would be returned by a subsequentcall to previous, or -1 if list iterator is at beginning of list.

        walkBackward(expected,testing);


        // forward,back,forward
        while(expected.hasNext()) {
            assertEquals(expected.nextIndex(),testing.nextIndex());
            assertEquals(expected.previousIndex(),testing.previousIndex());
            assertTrue(testing.hasNext());
            assertEquals(expected.next(),testing.next());
            assertTrue(testing.hasPrevious());
            assertEquals(expected.previous(),testing.previous());
            assertTrue(testing.hasNext());

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        for(int i=0;i<list.size();i++) {
            // walk forward i
            for(int j=0;j<i;j++) {
                assertEquals(expected.nextIndex(),testing.nextIndex());
                assertEquals(expected.previousIndex(),testing.previousIndex());
                assertTrue(expected.hasNext()); // if this one fails we've got a logic error in the test
                assertTrue(testing.hasNext());
                assertEquals(expected.next(),testing.next());
            }
            // walk back i/2

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                assertEquals(expected.next(),testing.next());
            }
            // walk back i/2
            for(int j=0;j<i/2;j++) {
                assertEquals(expected.nextIndex(),testing.nextIndex());
                assertEquals(expected.previousIndex(),testing.previousIndex());
                assertTrue(expected.hasPrevious()); // if this one fails we've got a logic error in the test
                assertTrue(testing.hasPrevious());
                assertEquals(expected.previous(),testing.previous());
            }
            // walk forward i/2

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                assertEquals(expected.previous(),testing.previous());
            }
            // walk forward i/2
            for(int j=0;j<i/2;j++) {
                assertEquals(expected.nextIndex(),testing.nextIndex());
                assertEquals(expected.previousIndex(),testing.previousIndex());
                assertTrue(expected.hasNext()); // if this one fails we've got a logic error in the test
                assertTrue(testing.hasNext());
                assertEquals(expected.next(),testing.next());
            }
            // walk back i

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                assertEquals(expected.next(),testing.next());
            }
            // walk back i
            for(int j=0;j<i;j++) {
                assertEquals(expected.nextIndex(),testing.nextIndex());
                assertEquals(expected.previousIndex(),testing.previousIndex());
                assertTrue(expected.hasPrevious()); // if this one fails we've got a logic error in the test
                assertTrue(testing.hasPrevious());
                assertEquals(expected.previous(),testing.previous());
            }
        }

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                if(expected.hasPrevious()) {
                    assertEquals(walkdescr.toString(),expected.previous(),testing.previous());
                }
            }
            assertEquals(walkdescr.toString(),expected.nextIndex(),testing.nextIndex());
            assertEquals(walkdescr.toString(),expected.previousIndex(),testing.previousIndex());
        }


    }


}

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        ListIterator it = makeEmptyListIterator();
        
        assertEquals(false, it.hasNext());
        assertEquals(0, it.nextIndex());
        assertEquals(false, it.hasPrevious());
        assertEquals(-1, it.previousIndex());
        
        // next() should throw a NoSuchElementException
        try {
            it.next();
            fail("NoSuchElementException must be thrown from empty ListIterator");

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        }
        
        // loop back through comparing
        for (int i = list.size() - 1; i >= 0; i--) {
            assertEquals(i + 1, it.nextIndex());
            assertEquals(i, it.previousIndex());
        
            Object obj = list.get(i);
            assertEquals(obj, it.previous());
        }

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        // Step 2 - Go though the new list.
        if (newList != null) {
            // Step i - Gather the list info.
            ListIterator iterator = (ListIterator)iteratorFor(newList);
            while (iterator.hasNext()) {
                newListValueIndex.put(iterator.next(), new Integer(iterator.previousIndex()));
            }
        
            // Step ii - Go through the new list again.        
            int index = 0;
            int offset = 0;

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        walkBackward(expected,testing);


        // forward,back,foward
        while(expected.hasNext()) {
            assertEquals(expected.nextIndex(),testing.nextIndex());
            assertEquals(expected.previousIndex(),testing.previousIndex());
            assertTrue(testing.hasNext());
            assertEquals(expected.next(),testing.next());
            assertTrue(testing.hasPrevious());
            assertEquals(expected.previous(),testing.previous());
            assertTrue(testing.hasNext());

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