Example usage for java.util ListIterator previousIndex

Introduction

In this page you can find the example usage for java.util ListIterator previousIndex.

Prototype

int previousIndex();

Source Link

Document

Returns the index of the element that would be returned by a subsequent call to #previous .

Usage

From source file:Main.java

public static void main(String[] args) {
    ArrayList<String> aList = new ArrayList<String>();

    aList.add("1");
    aList.add("2");
    aList.add("3");
    aList.add("4");
    aList.add("java2s.com");

    ListIterator<String> listIterator = aList.listIterator();
    System.out.println("Previous: " + listIterator.previousIndex());
    System.out.println("Next: " + listIterator.nextIndex());

    // advance current position by one using next method
    listIterator.next();//  w  w  w.  ja va  2  s . co  m
    System.out.println("Previous: " + listIterator.previousIndex());
    System.out.println("Next: " + listIterator.nextIndex());
}

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From source file:Main.java

public static void main(String[] args) {
    ArrayList<String> aList = new ArrayList<String>();

    aList.add("1");
    aList.add("2");
    aList.add("3");
    aList.add("4");
    aList.add("5");

    ListIterator<String> listIterator = aList.listIterator();
    System.out.println("Previous: " + listIterator.previousIndex());
    System.out.println("Next: " + listIterator.nextIndex());

    // advance current position by one using next method
    listIterator.next();//from  ww w .  ja va2s  .  c  om
    System.out.println("Previous: " + listIterator.previousIndex());
    System.out.println("Next: " + listIterator.nextIndex());
}

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From source file:Main.java

public static void main(String[] args) {
    List<String> list = new ArrayList<>();
    list.add("Oracle");
    list.add("SQL");
    list.add("CSS");
    list.add("XML");
    System.out.println("List: " + list);
    // Get the list iterator
    ListIterator<String> iterator = list.listIterator();
    while (iterator.hasNext()) {
        int index = iterator.nextIndex();
        String element = iterator.next();
        System.out.println("Index=" + index + ", Element=" + element);
    }//from  w  w w .j a va 2  s.  c om
    // Reuse the iterator to iterate from the end to the beginning
    while (iterator.hasPrevious()) {
        int index = iterator.previousIndex();
        String element = iterator.previous();
        System.out.println("Index=" + index + ",  Element=" + element);
    }
}

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From source file:Main.java

/**
 * Finds an item by iterating through the specified iterator.
 * /*  ww  w . j a  v a 2 s .c o  m*/
 * @param item the object to find
 * @param iter the iterator to examine
 * @return list index of the item or -1 if the item was not found
 */
public static int findObject(Object item, ListIterator<?> iter) {
    while (iter.hasNext()) {
        Object o = iter.next();
        if (item == null ? o == null : item.equals(o)) {
            return iter.previousIndex();
        }
    }
    return -1;
}

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From source file:Main.java

/**
 * Returns a list iterator that swaps all previous/next calls.
 * <p><b>Important:</b> The returned iterator violates the {@link ListIterator#nextIndex()} and {@link ListIterator#previousIndex()} specifications.
 *//* w  ww. java2  s .c  om*/
public static <E> ListIterator<E> reverse(ListIterator<E> iterator) {
    return new ListIterator<E>() {
        @Override
        public boolean hasNext() {
            return iterator.hasPrevious();
        }

        @Override
        public E next() {
            return iterator.previous();
        }

        @Override
        public boolean hasPrevious() {
            return iterator.hasNext();
        }

        @Override
        public E previous() {
            return iterator.next();
        }

        @Override
        public int nextIndex() {
            return iterator.previousIndex();
        }

        @Override
        public int previousIndex() {
            return iterator.nextIndex();
        }

        @Override
        public void remove() {
            iterator.remove();
        }

        @Override
        public void set(E e) {
            iterator.set(e);
        }

        @Override
        public void add(E e) {
            iterator.add(e);
        }
    };
}

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From source file:Main.java

/**
 * Wraps an <code>ListIterator</code> and returns a <code>ListIterator</code>
 * that cannot modify the underlying list.
 * All methods that could be used to modify the list throw
 * <code>UnsupportedOperationException</code>
 * @param underlying original list iterator
 * @param <T> element type//www. ja  v  a 2 s. c o m
 * @return unmodifiable list iterator
 */
@Nonnull
public static <T> ListIterator<T> unmodifiableListIterator(final @Nonnull ListIterator<T> underlying) {
    return new ListIterator<T>() {
        public boolean hasNext() {
            return underlying.hasNext();
        }

        public T next() {
            return underlying.next();
        }

        public boolean hasPrevious() {
            return underlying.hasPrevious();
        }

        public T previous() {
            return underlying.previous();
        }

        public int nextIndex() {
            return underlying.nextIndex();
        }

        public int previousIndex() {
            return underlying.previousIndex();
        }

        public void remove() {
            throw new UnsupportedOperationException();
        }

        public void set(T t) {
            throw new UnsupportedOperationException();
        }

        public void add(T t) {
            throw new UnsupportedOperationException();
        }
    };
}

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From source file:it.unimi.di.big.mg4j.document.tika.AbstractTikaDocumentFactory.java

@Override
public int fieldIndex(String fieldName) {
    // TODO: use a map
    ListIterator<TikaField> li = fields().listIterator();
    while (li.hasNext()) {
        if (li.next().mg4jName().equals(fieldName))
            return li.previousIndex();
    }/*  w  w w .  jav a  2  s. c o  m*/
    return -1;
}

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From source file:ListOfLists.java

public int indexOf(Object o) {
    ListIterator e = listIterator();
    if (o == null) {
        while (e.hasNext()) {
            if (e.next() == null)
                return e.previousIndex();
        }/*w  ww.j a  va2  s .  c  om*/
    } else {
        Object el;
        while (e.hasNext()) {
            el = e.next();
            if (el.equals(o))
                return e.previousIndex();
        }
    }
    return -1;
}

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From source file:org.jasig.i18n.translate.AutoTranslationService.java

public Map<String, String> getAutoUpdatedTranslationMap(Map<String, String> mainMap,
        Map<String, String> targetMap, String languageKey) {

    // assemble a set of keys represented in the main map but not in the
    // target language map
    Set<String> missing = mainMap.keySet();
    missing.removeAll(targetMap.keySet());

    // put the keys in a list so that we have a consistent ordering
    List<String> keys = new ArrayList<String>();
    keys.addAll(missing);//from   w ww .ja va 2  s  .  c o  m

    // assemble a list of untranslated messages in the same order as our
    // missing key list
    List<String> untranslatedMessages = new ArrayList<String>();
    for (String key : keys) {
        untranslatedMessages.add(mainMap.get(key));
    }

    Map<String, Object> parameters = new HashMap<String, Object>();
    parameters.put("key", this.apiKey);
    parameters.put("source", this.defaultLanguageKey);
    parameters.put("target", languageKey);
    parameters.put("query", untranslatedMessages);

    GoogleTranslationResponse response = this.restTemplate.getForObject(urlTemplate,
            GoogleTranslationResponse.class, parameters);
    List<Translation> translations = response.getTranslations();

    // iterate through the auto-translations, adding each to the target
    // map
    ListIterator<Translation> iter = translations.listIterator();
    while (iter.hasNext()) {
        Translation translation = iter.next();
        String key = keys.get(iter.previousIndex());
        targetMap.put(key, translation.getTranslatedText());
    }

    return targetMap;
}

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From source file:com.google.gwt.emultest.java.util.ListTestBase.java

public void testListIteratorHasNextHasPreviousAndIndexes() {
    List l = makeEmptyList();//from ww w  .  j  a v  a2  s  . c  o m
    ListIterator i = l.listIterator();
    assertFalse(i.hasNext());
    assertFalse(i.hasPrevious());
    i.add(new Integer(1));
    assertEquals(1, i.nextIndex());
    assertEquals(0, i.previousIndex());
    i = l.listIterator();
    assertEquals(0, i.nextIndex());
    assertEquals(-1, i.previousIndex());
    assertTrue(i.hasNext());
    assertFalse(i.hasPrevious());
    i.next();
    assertEquals(1, i.nextIndex());
    assertEquals(0, i.previousIndex());
    assertFalse(i.hasNext());
    assertTrue(i.hasPrevious());
}

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