下面列出了java.util.ListIterator#forEachRemaining ( ) 实例代码，或者点击链接到github查看源代码，也可以在右侧发表评论。
public static <T> void test_forEachRemaining_list(List<T> collection, T[] initialData)
throws Exception {
test_forEachRemaining(collection, initialData);
ArrayList<T> recorder = new ArrayList<>();
ListIterator<T> lit = collection.listIterator(1);
lit.forEachRemaining((T i) -> recorder.add(i));
if (initialData.length > 0) {
assertEquals(initialData.length - 1, recorder.size());
for (int i = 1; i < initialData.length; i++){
assertEquals(initialData[i], recorder.get(i - 1));
}
}
}
public void testOptimizedForEach() throws Exception {
final Integer[] data = new Integer[1000 * 1000];
for (int i=0; i < data.length; i++) {
data[i] = i;
}
final List<Integer> source = Arrays.asList(data);
final String[] listClasses = {
"java.util.ArrayList",
"java.util.LinkedList",
"java.util.Vector",
"java.util.concurrent.CopyOnWriteArrayList"
};
final int OFFSET = 3;
final List<Integer> target = new ArrayList<>(source);
for (final String listClass : listClasses) {
final List<Integer> list =
(List<Integer>) Class.forName(listClass).newInstance();
list.addAll(source);
final ListIterator<Integer> iterator = list.listIterator();
assertFalse(iterator.hasPrevious());
for (int i=0; i < OFFSET; i++) {
iterator.next();
}
assertTrue(iterator.hasNext());
assertTrue(iterator.hasPrevious());
assertEquals(iterator.nextIndex(), OFFSET);
assertEquals(iterator.previousIndex(), OFFSET - 1);
iterator.forEachRemaining(e -> {
target.set(e, e + 1);
});
for (int i=OFFSET; i < data.length; i++) {
assertEquals(target.get(i).intValue(), source.get(i)+1);
}
assertFalse(iterator.hasNext());
assertTrue(iterator.hasPrevious());
assertEquals(iterator.nextIndex(), data.length);
assertEquals(iterator.previousIndex(), data.length - 1);
// CopyOnWriteArrayList.listIterator().remove() is unsupported
if (!"java.util.concurrent.CopyOnWriteArrayList".equals(listClass)) {
for (int i = data.length - 1; i >= 0; i--) {
iterator.remove(); // must not throw
if (i > 0) {
iterator.previous();
}
}
assertTrue(list.isEmpty());
}
try {
iterator.next();
fail(listClass + " iterator advanced beyond end");
} catch (NoSuchElementException ignore) {
}
}
}
public void testOptimizedForEach() throws Exception {
final Integer[] data = new Integer[1000 * 1000];
for (int i=0; i < data.length; i++) {
data[i] = i;
}
final List<Integer> source = Arrays.asList(data);
final String[] listClasses = {
"java.util.ArrayList",
"java.util.LinkedList",
"java.util.Vector",
"java.util.concurrent.CopyOnWriteArrayList"
};
final int OFFSET = 3;
final List<Integer> target = new ArrayList<>(source);
for (final String listClass : listClasses) {
final List<Integer> list =
(List<Integer>) Class.forName(listClass).newInstance();
list.addAll(source);
final ListIterator<Integer> iterator = list.listIterator();
assertFalse(iterator.hasPrevious());
for (int i=0; i < OFFSET; i++) {
iterator.next();
}
assertTrue(iterator.hasNext());
assertTrue(iterator.hasPrevious());
assertEquals(iterator.nextIndex(), OFFSET);
assertEquals(iterator.previousIndex(), OFFSET - 1);
iterator.forEachRemaining(e -> {
target.set(e, e + 1);
});
for (int i=OFFSET; i < data.length; i++) {
assertEquals(target.get(i).intValue(), source.get(i)+1);
}
assertFalse(iterator.hasNext());
assertTrue(iterator.hasPrevious());
assertEquals(iterator.nextIndex(), data.length);
assertEquals(iterator.previousIndex(), data.length - 1);
// CopyOnWriteArrayList.listIterator().remove() is unsupported
if (!"java.util.concurrent.CopyOnWriteArrayList".equals(listClass)) {
for (int i = data.length - 1; i >= 0; i--) {
iterator.remove(); // must not throw
if (i > 0) {
iterator.previous();
}
}
assertTrue(list.isEmpty());
}
try {
iterator.next();
fail(listClass + " iterator advanced beyond end");
} catch (NoSuchElementException ignore) {
}
}
}
public void testOptimizedForEach() throws Exception {
final Integer[] data = new Integer[1000 * 1000];
for (int i=0; i < data.length; i++) {
data[i] = i;
}
final List<Integer> source = Arrays.asList(data);
final String[] listClasses = {
"java.util.ArrayList",
"java.util.LinkedList",
"java.util.Vector",
"java.util.concurrent.CopyOnWriteArrayList"
};
final int OFFSET = 3;
final List<Integer> target = new ArrayList<>(source);
for (final String listClass : listClasses) {
final List<Integer> list =
(List<Integer>) Class.forName(listClass).newInstance();
list.addAll(source);
final ListIterator<Integer> iterator = list.listIterator();
assertFalse(iterator.hasPrevious());
for (int i=0; i < OFFSET; i++) {
iterator.next();
}
assertTrue(iterator.hasNext());
assertTrue(iterator.hasPrevious());
assertEquals(iterator.nextIndex(), OFFSET);
assertEquals(iterator.previousIndex(), OFFSET - 1);
iterator.forEachRemaining(e -> {
target.set(e, e + 1);
});
for (int i=OFFSET; i < data.length; i++) {
assertEquals(target.get(i).intValue(), source.get(i)+1);
}
assertFalse(iterator.hasNext());
assertTrue(iterator.hasPrevious());
assertEquals(iterator.nextIndex(), data.length);
assertEquals(iterator.previousIndex(), data.length - 1);
// CopyOnWriteArrayList.listIterator().remove() is unsupported
if (!"java.util.concurrent.CopyOnWriteArrayList".equals(listClass)) {
for (int i = data.length - 1; i >= 0; i--) {
iterator.remove(); // must not throw
if (i > 0) {
iterator.previous();
}
}
assertTrue(list.isEmpty());
}
try {
iterator.next();
fail(listClass + " iterator advanced beyond end");
} catch (NoSuchElementException ignore) {
}
}
}
public void testOptimizedForEach() throws Exception {
final Integer[] data = new Integer[1000 * 1000];
for (int i=0; i < data.length; i++) {
data[i] = i;
}
final List<Integer> source = Arrays.asList(data);
final String[] listClasses = {
"java.util.ArrayList",
"java.util.LinkedList",
"java.util.Vector",
"java.util.concurrent.CopyOnWriteArrayList"
};
final int OFFSET = 3;
final List<Integer> target = new ArrayList<>(source);
for (final String listClass : listClasses) {
final List<Integer> list =
(List<Integer>) Class.forName(listClass).newInstance();
list.addAll(source);
final ListIterator<Integer> iterator = list.listIterator();
assertFalse(iterator.hasPrevious());
for (int i=0; i < OFFSET; i++) {
iterator.next();
}
assertTrue(iterator.hasNext());
assertTrue(iterator.hasPrevious());
assertEquals(iterator.nextIndex(), OFFSET);
assertEquals(iterator.previousIndex(), OFFSET - 1);
iterator.forEachRemaining(e -> {
target.set(e, e + 1);
});
for (int i=OFFSET; i < data.length; i++) {
assertEquals(target.get(i).intValue(), source.get(i)+1);
}
assertFalse(iterator.hasNext());
assertTrue(iterator.hasPrevious());
assertEquals(iterator.nextIndex(), data.length);
assertEquals(iterator.previousIndex(), data.length - 1);
// CopyOnWriteArrayList.listIterator().remove() is unsupported
if (!"java.util.concurrent.CopyOnWriteArrayList".equals(listClass)) {
for (int i = data.length - 1; i >= 0; i--) {
iterator.remove(); // must not throw
if (i > 0) {
iterator.previous();
}
}
assertTrue(list.isEmpty());
}
try {
iterator.next();
fail(listClass + " iterator advanced beyond end");
} catch (NoSuchElementException ignore) {
}
}
}
public void testOptimizedForEach() throws Exception {
final Integer[] data = new Integer[1000 * 1000];
for (int i=0; i < data.length; i++) {
data[i] = i;
}
final List<Integer> source = Arrays.asList(data);
final String[] listClasses = {
"java.util.ArrayList",
"java.util.LinkedList",
"java.util.Vector",
"java.util.concurrent.CopyOnWriteArrayList"
};
final int OFFSET = 3;
final List<Integer> target = new ArrayList<>(source);
for (final String listClass : listClasses) {
final List<Integer> list =
(List<Integer>) Class.forName(listClass).newInstance();
list.addAll(source);
final ListIterator<Integer> iterator = list.listIterator();
assertFalse(iterator.hasPrevious());
for (int i=0; i < OFFSET; i++) {
iterator.next();
}
assertTrue(iterator.hasNext());
assertTrue(iterator.hasPrevious());
assertEquals(iterator.nextIndex(), OFFSET);
assertEquals(iterator.previousIndex(), OFFSET - 1);
iterator.forEachRemaining(e -> {
target.set(e, e + 1);
});
for (int i=OFFSET; i < data.length; i++) {
assertEquals(target.get(i).intValue(), source.get(i)+1);
}
assertFalse(iterator.hasNext());
assertTrue(iterator.hasPrevious());
assertEquals(iterator.nextIndex(), data.length);
assertEquals(iterator.previousIndex(), data.length - 1);
// CopyOnWriteArrayList.listIterator().remove() is unsupported
if (!"java.util.concurrent.CopyOnWriteArrayList".equals(listClass)) {
for (int i = data.length - 1; i >= 0; i--) {
iterator.remove(); // must not throw
if (i > 0) {
iterator.previous();
}
}
assertTrue(list.isEmpty());
}
try {
iterator.next();
fail(listClass + " iterator advanced beyond end");
} catch (NoSuchElementException ignore) {
}
}
}
public void testOptimizedForEach() throws Exception {
final Integer[] data = new Integer[1000 * 1000];
for (int i=0; i < data.length; i++) {
data[i] = i;
}
final List<Integer> source = Arrays.asList(data);
final String[] listClasses = {
"java.util.ArrayList",
"java.util.LinkedList",
"java.util.Vector",
"java.util.concurrent.CopyOnWriteArrayList"
};
final int OFFSET = 3;
final List<Integer> target = new ArrayList<>(source);
for (final String listClass : listClasses) {
final List<Integer> list =
(List<Integer>) Class.forName(listClass).newInstance();
list.addAll(source);
final ListIterator<Integer> iterator = list.listIterator();
assertFalse(iterator.hasPrevious());
for (int i=0; i < OFFSET; i++) {
iterator.next();
}
assertTrue(iterator.hasNext());
assertTrue(iterator.hasPrevious());
assertEquals(iterator.nextIndex(), OFFSET);
assertEquals(iterator.previousIndex(), OFFSET - 1);
iterator.forEachRemaining(e -> {
target.set(e, e + 1);
});
for (int i=OFFSET; i < data.length; i++) {
assertEquals(target.get(i).intValue(), source.get(i)+1);
}
assertFalse(iterator.hasNext());
assertTrue(iterator.hasPrevious());
assertEquals(iterator.nextIndex(), data.length);
assertEquals(iterator.previousIndex(), data.length - 1);
// CopyOnWriteArrayList.listIterator().remove() is unsupported
if (!"java.util.concurrent.CopyOnWriteArrayList".equals(listClass)) {
for (int i = data.length - 1; i >= 0; i--) {
iterator.remove(); // must not throw
if (i > 0) {
iterator.previous();
}
}
assertTrue(list.isEmpty());
}
try {
iterator.next();
fail(listClass + " iterator advanced beyond end");
} catch (NoSuchElementException ignore) {
}
}
}
public void testOptimizedForEach() throws Exception {
final Integer[] data = new Integer[1000 * 1000];
for (int i=0; i < data.length; i++) {
data[i] = i;
}
final List<Integer> source = Arrays.asList(data);
final String[] listClasses = {
"java.util.ArrayList",
"java.util.LinkedList",
"java.util.Vector",
"java.util.concurrent.CopyOnWriteArrayList"
};
final int OFFSET = 3;
final List<Integer> target = new ArrayList<>(source);
for (final String listClass : listClasses) {
final List<Integer> list =
(List<Integer>) Class.forName(listClass).newInstance();
list.addAll(source);
final ListIterator<Integer> iterator = list.listIterator();
assertFalse(iterator.hasPrevious());
for (int i=0; i < OFFSET; i++) {
iterator.next();
}
assertTrue(iterator.hasNext());
assertTrue(iterator.hasPrevious());
assertEquals(iterator.nextIndex(), OFFSET);
assertEquals(iterator.previousIndex(), OFFSET - 1);
iterator.forEachRemaining(e -> {
target.set(e, e + 1);
});
for (int i=OFFSET; i < data.length; i++) {
assertEquals(target.get(i).intValue(), source.get(i)+1);
}
assertFalse(iterator.hasNext());
assertTrue(iterator.hasPrevious());
assertEquals(iterator.nextIndex(), data.length);
assertEquals(iterator.previousIndex(), data.length - 1);
// CopyOnWriteArrayList.listIterator().remove() is unsupported
if (!"java.util.concurrent.CopyOnWriteArrayList".equals(listClass)) {
for (int i = data.length - 1; i >= 0; i--) {
iterator.remove(); // must not throw
if (i > 0) {
iterator.previous();
}
}
assertTrue(list.isEmpty());
}
try {
iterator.next();
fail(listClass + " iterator advanced beyond end");
} catch (NoSuchElementException ignore) {
}
}
}
public void testOptimizedForEach() throws Exception {
final Integer[] data = new Integer[1000 * 1000];
for (int i=0; i < data.length; i++) {
data[i] = i;
}
final List<Integer> source = Arrays.asList(data);
final String[] listClasses = {
"java.util.ArrayList",
"java.util.LinkedList",
"java.util.Vector",
"java.util.concurrent.CopyOnWriteArrayList"
};
final int OFFSET = 3;
final List<Integer> target = new ArrayList<>(source);
for (final String listClass : listClasses) {
final List<Integer> list =
(List<Integer>) Class.forName(listClass).newInstance();
list.addAll(source);
final ListIterator<Integer> iterator = list.listIterator();
assertFalse(iterator.hasPrevious());
for (int i=0; i < OFFSET; i++) {
iterator.next();
}
assertTrue(iterator.hasNext());
assertTrue(iterator.hasPrevious());
assertEquals(iterator.nextIndex(), OFFSET);
assertEquals(iterator.previousIndex(), OFFSET - 1);
iterator.forEachRemaining(e -> {
target.set(e, e + 1);
});
for (int i=OFFSET; i < data.length; i++) {
assertEquals(target.get(i).intValue(), source.get(i)+1);
}
assertFalse(iterator.hasNext());
assertTrue(iterator.hasPrevious());
assertEquals(iterator.nextIndex(), data.length);
assertEquals(iterator.previousIndex(), data.length - 1);
// CopyOnWriteArrayList.listIterator().remove() is unsupported
if (!"java.util.concurrent.CopyOnWriteArrayList".equals(listClass)) {
for (int i = data.length - 1; i >= 0; i--) {
iterator.remove(); // must not throw
if (i > 0) {
iterator.previous();
}
}
assertTrue(list.isEmpty());
}
try {
iterator.next();
fail(listClass + " iterator advanced beyond end");
} catch (NoSuchElementException ignore) {
}
}
}
public void testOptimizedForEach() throws Exception {
final Integer[] data = new Integer[1000 * 1000];
for (int i=0; i < data.length; i++) {
data[i] = i;
}
final List<Integer> source = Arrays.asList(data);
final String[] listClasses = {
"java.util.ArrayList",
"java.util.LinkedList",
"java.util.Vector",
"java.util.concurrent.CopyOnWriteArrayList"
};
final int OFFSET = 3;
final List<Integer> target = new ArrayList<>(source);
for (final String listClass : listClasses) {
final List<Integer> list =
(List<Integer>) Class.forName(listClass).newInstance();
list.addAll(source);
final ListIterator<Integer> iterator = list.listIterator();
assertFalse(iterator.hasPrevious());
for (int i=0; i < OFFSET; i++) {
iterator.next();
}
assertTrue(iterator.hasNext());
assertTrue(iterator.hasPrevious());
assertEquals(iterator.nextIndex(), OFFSET);
assertEquals(iterator.previousIndex(), OFFSET - 1);
iterator.forEachRemaining(e -> {
target.set(e, e + 1);
});
for (int i=OFFSET; i < data.length; i++) {
assertEquals(target.get(i).intValue(), source.get(i)+1);
}
assertFalse(iterator.hasNext());
assertTrue(iterator.hasPrevious());
assertEquals(iterator.nextIndex(), data.length);
assertEquals(iterator.previousIndex(), data.length - 1);
// CopyOnWriteArrayList.listIterator().remove() is unsupported
if (!"java.util.concurrent.CopyOnWriteArrayList".equals(listClass)) {
for (int i = data.length - 1; i >= 0; i--) {
iterator.remove(); // must not throw
if (i > 0) {
iterator.previous();
}
}
assertTrue(list.isEmpty());
}
try {
iterator.next();
fail(listClass + " iterator advanced beyond end");
} catch (NoSuchElementException ignore) {
}
}
}
public void testOptimizedForEach() throws Exception {
final Integer[] data = new Integer[1000 * 1000];
for (int i=0; i < data.length; i++) {
data[i] = i;
}
final List<Integer> source = Arrays.asList(data);
final String[] listClasses = {
"java.util.ArrayList",
"java.util.LinkedList",
"java.util.Vector",
"java.util.concurrent.CopyOnWriteArrayList"
};
final int OFFSET = 3;
final List<Integer> target = new ArrayList<>(source);
for (final String listClass : listClasses) {
final List<Integer> list =
(List<Integer>) Class.forName(listClass).newInstance();
list.addAll(source);
final ListIterator<Integer> iterator = list.listIterator();
assertFalse(iterator.hasPrevious());
for (int i=0; i < OFFSET; i++) {
iterator.next();
}
assertTrue(iterator.hasNext());
assertTrue(iterator.hasPrevious());
assertEquals(iterator.nextIndex(), OFFSET);
assertEquals(iterator.previousIndex(), OFFSET - 1);
iterator.forEachRemaining(e -> {
target.set(e, e + 1);
});
for (int i=OFFSET; i < data.length; i++) {
assertEquals(target.get(i).intValue(), source.get(i)+1);
}
assertFalse(iterator.hasNext());
assertTrue(iterator.hasPrevious());
assertEquals(iterator.nextIndex(), data.length);
assertEquals(iterator.previousIndex(), data.length - 1);
// CopyOnWriteArrayList.listIterator().remove() is unsupported
if (!"java.util.concurrent.CopyOnWriteArrayList".equals(listClass)) {
for (int i = data.length - 1; i >= 0; i--) {
iterator.remove(); // must not throw
if (i > 0) {
iterator.previous();
}
}
assertTrue(list.isEmpty());
}
try {
iterator.next();
fail(listClass + " iterator advanced beyond end");
} catch (NoSuchElementException ignore) {
}
}
}
public void testOptimizedForEach() throws Exception {
final Integer[] data = new Integer[1000 * 1000];
for (int i=0; i < data.length; i++) {
data[i] = i;
}
final List<Integer> source = Arrays.asList(data);
final String[] listClasses = {
"java.util.ArrayList",
"java.util.LinkedList",
"java.util.Vector",
"java.util.concurrent.CopyOnWriteArrayList"
};
final int OFFSET = 3;
final List<Integer> target = new ArrayList<>(source);
for (final String listClass : listClasses) {
final List<Integer> list =
(List<Integer>) Class.forName(listClass).newInstance();
list.addAll(source);
final ListIterator<Integer> iterator = list.listIterator();
assertFalse(iterator.hasPrevious());
for (int i=0; i < OFFSET; i++) {
iterator.next();
}
assertTrue(iterator.hasNext());
assertTrue(iterator.hasPrevious());
assertEquals(iterator.nextIndex(), OFFSET);
assertEquals(iterator.previousIndex(), OFFSET - 1);
iterator.forEachRemaining(e -> {
target.set(e, e + 1);
});
for (int i=OFFSET; i < data.length; i++) {
assertEquals(target.get(i).intValue(), source.get(i)+1);
}
assertFalse(iterator.hasNext());
assertTrue(iterator.hasPrevious());
assertEquals(iterator.nextIndex(), data.length);
assertEquals(iterator.previousIndex(), data.length - 1);
// CopyOnWriteArrayList.listIterator().remove() is unsupported
if (!"java.util.concurrent.CopyOnWriteArrayList".equals(listClass)) {
for (int i = data.length - 1; i >= 0; i--) {
iterator.remove(); // must not throw
if (i > 0) {
iterator.previous();
}
}
assertTrue(list.isEmpty());
}
try {
iterator.next();
fail(listClass + " iterator advanced beyond end");
} catch (NoSuchElementException ignore) {
}
}
}
public void testOptimizedForEach() throws Exception {
final Integer[] data = new Integer[1000 * 1000];
for (int i=0; i < data.length; i++) {
data[i] = i;
}
final List<Integer> source = Arrays.asList(data);
final String[] listClasses = {
"java.util.ArrayList",
"java.util.LinkedList",
"java.util.Vector",
"java.util.concurrent.CopyOnWriteArrayList"
};
final int OFFSET = 3;
final List<Integer> target = new ArrayList<>(source);
for (final String listClass : listClasses) {
final List<Integer> list =
(List<Integer>) Class.forName(listClass).newInstance();
list.addAll(source);
final ListIterator<Integer> iterator = list.listIterator();
assertFalse(iterator.hasPrevious());
for (int i=0; i < OFFSET; i++) {
iterator.next();
}
assertTrue(iterator.hasNext());
assertTrue(iterator.hasPrevious());
assertEquals(iterator.nextIndex(), OFFSET);
assertEquals(iterator.previousIndex(), OFFSET - 1);
iterator.forEachRemaining(e -> {
target.set(e, e + 1);
});
for (int i=OFFSET; i < data.length; i++) {
assertEquals(target.get(i).intValue(), source.get(i)+1);
}
assertFalse(iterator.hasNext());
assertTrue(iterator.hasPrevious());
assertEquals(iterator.nextIndex(), data.length);
assertEquals(iterator.previousIndex(), data.length - 1);
// CopyOnWriteArrayList.listIterator().remove() is unsupported
if (!"java.util.concurrent.CopyOnWriteArrayList".equals(listClass)) {
for (int i = data.length - 1; i >= 0; i--) {
iterator.remove(); // must not throw
if (i > 0) {
iterator.previous();
}
}
assertTrue(list.isEmpty());
}
try {
iterator.next();
fail(listClass + " iterator advanced beyond end");
} catch (NoSuchElementException ignore) {
}
}
}
public void testOptimizedForEach() throws Exception {
final Integer[] data = new Integer[1000 * 1000];
for (int i=0; i < data.length; i++) {
data[i] = i;
}
final List<Integer> source = Arrays.asList(data);
final String[] listClasses = {
"java.util.ArrayList",
"java.util.LinkedList",
"java.util.Vector",
"java.util.concurrent.CopyOnWriteArrayList"
};
final int OFFSET = 3;
final List<Integer> target = new ArrayList<>(source);
for (final String listClass : listClasses) {
final List<Integer> list =
(List<Integer>) Class.forName(listClass).newInstance();
list.addAll(source);
final ListIterator<Integer> iterator = list.listIterator();
assertFalse(iterator.hasPrevious());
for (int i=0; i < OFFSET; i++) {
iterator.next();
}
assertTrue(iterator.hasNext());
assertTrue(iterator.hasPrevious());
assertEquals(iterator.nextIndex(), OFFSET);
assertEquals(iterator.previousIndex(), OFFSET - 1);
iterator.forEachRemaining(e -> {
target.set(e, e + 1);
});
for (int i=OFFSET; i < data.length; i++) {
assertEquals(target.get(i).intValue(), source.get(i)+1);
}
assertFalse(iterator.hasNext());
assertTrue(iterator.hasPrevious());
assertEquals(iterator.nextIndex(), data.length);
assertEquals(iterator.previousIndex(), data.length - 1);
// CopyOnWriteArrayList.listIterator().remove() is unsupported
if (!"java.util.concurrent.CopyOnWriteArrayList".equals(listClass)) {
for (int i = data.length - 1; i >= 0; i--) {
iterator.remove(); // must not throw
if (i > 0) {
iterator.previous();
}
}
assertTrue(list.isEmpty());
}
try {
iterator.next();
fail(listClass + " iterator advanced beyond end");
} catch (NoSuchElementException ignore) {
}
}
}