本文整理了Java中java.util.ArrayList.clear()方法的一些代码示例，展示了ArrayList.clear()的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。ArrayList.clear()方法的具体详情如下：
包路径：java.util.ArrayList
类名称：ArrayList
方法名：clear

ArrayList.clear介绍

[英]Removes all elements from this ArrayList, leaving it empty.
[中]删除此ArrayList中的所有元素，将其保留为空。

代码示例

代码示例来源：origin: netty/netty

@SuppressWarnings("unchecked")
public <E> ArrayList<E> arrayList(int minCapacity) {
  ArrayList<E> list = (ArrayList<E>) arrayList;
  if (list == null) {
    arrayList = new ArrayList<Object>(minCapacity);
    return (ArrayList<E>) arrayList;
  }
  list.clear();
  list.ensureCapacity(minCapacity);
  return list;
}

代码示例来源：origin: google/ExoPlayer

private void updateSampleStreams(SampleStream[] streams) {
 hlsSampleStreams.clear();
 for (SampleStream stream : streams) {
  if (stream != null) {
   hlsSampleStreams.add((HlsSampleStream) stream);
  }
 }
}

代码示例来源：origin: google/ExoPlayer

/**
 * Returns the {@link DataSpec} instances passed to {@link #open(DataSpec)} since the last call to
 * this method.
 */
public final DataSpec[] getAndClearOpenedDataSpecs() {
 DataSpec[] dataSpecs = new DataSpec[openedDataSpecs.size()];
 openedDataSpecs.toArray(dataSpecs);
 openedDataSpecs.clear();
 return dataSpecs;
}

代码示例来源：origin: stanfordnlp/CoreNLP

private int[][][][] createPartialDataForLOP(int lopIter, int[][][][] data) {
 ArrayList<Integer> newFeatureList = new ArrayList<>(1000);
 Set<Integer> featureIndicesSet = featureIndicesSetArray.get(lopIter);
 int[][][][] newData = new int[data.length][][][];
 for (int i = 0; i < data.length; i++) {
  newData[i] = new int[data[i].length][][];
  for (int j = 0; j < data[i].length; j++) {
   newData[i][j] = new int[data[i][j].length][];
   for (int k = 0; k < data[i][j].length; k++) {
    int[] oldFeatures = data[i][j][k];
    newFeatureList.clear();
    for (int oldFeatureIndex : oldFeatures) {
     if (featureIndicesSet.contains(oldFeatureIndex)) {
      newFeatureList.add(oldFeatureIndex);
     }
    }
    newData[i][j][k] = new int[newFeatureList.size()];
    for (int l = 0; l < newFeatureList.size(); ++l) {
     newData[i][j][k][l] = newFeatureList.get(l);
    }
   }
  }
 }
 return newData;
}

代码示例来源：origin: apache/hbase

private void cancelAllChores(final boolean mayInterruptIfRunning) {
 ArrayList<ScheduledChore> choresToCancel = new ArrayList<>(scheduledChores.keySet().size());
 // Build list of chores to cancel so we can iterate through a set that won't change
 // as chores are cancelled. If we tried to cancel each chore while iterating through
 // keySet the results would be undefined because the keySet would be changing
 for (ScheduledChore chore : scheduledChores.keySet()) {
  choresToCancel.add(chore);
 }
 for (ScheduledChore chore : choresToCancel) {
  cancelChore(chore, mayInterruptIfRunning);
 }
 choresToCancel.clear();
}

代码示例来源：origin: com.h2database/h2

private void applyOffset() {
  if (offset <= 0) {
    return;
  }
  if (external == null) {
    if (offset >= rows.size()) {
      rows.clear();
      rowCount = 0;
    } else {
      // avoid copying the whole array for each row
      int remove = Math.min(offset, rows.size());
      rows = new ArrayList<>(rows.subList(remove, rows.size()));
      rowCount -= remove;
    }
  } else {
    if (offset >= rowCount) {
      rowCount = 0;
    } else {
      diskOffset = offset;
      rowCount -= offset;
    }
  }
  distinctRows = null;
}

代码示例来源：origin: novoda/android-demos

public void setInitalPositionMultiPoints(MotionEvent event) {
  touchPoints.clear();
  int pointerIndex = 0;
  for (int index = 0; index < event.getPointerCount(); ++index) {
    pointerIndex = event.getPointerId(index);
    touchPoints.add(new PointF(event.getX(pointerIndex), event.getY(pointerIndex)));
  }
  double r = Math.atan2(touchPoints.get(1).x - touchPoints.get(1 - 1).x,
      touchPoints.get(1).y - touchPoints.get(1 - 1).y);
  old_degrees = -(int) Math.toDegrees(r);
}

代码示例来源：origin: apache/hbase

@Override
public synchronized Optional<CompactionContext> selectCompaction() {
 CompactionContext ctx = new TestCompactionContext(new ArrayList<>(notCompacting));
 compacting.addAll(notCompacting);
 notCompacting.clear();
 try {
  ctx.select(null, false, false, false);
 } catch (IOException ex) {
  fail("Shouldn't happen");
 }
 return Optional.of(ctx);
}

代码示例来源：origin: apache/flink

@Override
  public void reduce(Iterable<Tuple2<Long, Long>> values, Collector<Tuple2<Long, Long[]>> out) {
    neighbors.clear();
    Long id = 0L;
    for (Tuple2<Long, Long> n : values) {
      id = n.f0;
      neighbors.add(n.f1);
    }
    out.collect(new Tuple2<Long, Long[]>(id, neighbors.toArray(new Long[neighbors.size()])));
  }
}

代码示例来源：origin: redisson/redisson

@Override
  public void freeAll() {
    for (int i = 0; i < allocated.size(); i++) {
      MallocBytez mallocBytez = allocated.get(i);
      mallocBytez.free();
    }
    allocated.clear();
  }
}

代码示例来源：origin: TeamNewPipe/NewPipe

public void setItems(List<SuggestionItem> items) {
  this.items.clear();
  if (showSuggestionHistory) {
    this.items.addAll(items);
  } else {
    // remove history items if history is disabled
    for (SuggestionItem item : items) {
      if (!item.fromHistory) {
        this.items.add(item);
      }
    }
  }
  notifyDataSetChanged();
}

代码示例来源：origin: H07000223/FlycoTabLayout

public void setTabData(ArrayList<CustomTabEntity> tabEntitys) {
  if (tabEntitys == null || tabEntitys.size() == 0) {
    throw new IllegalStateException("TabEntitys can not be NULL or EMPTY !");
  }
  this.mTabEntitys.clear();
  this.mTabEntitys.addAll(tabEntitys);
  notifyDataSetChanged();
}

代码示例来源：origin: aurelhubert/ahbottomnavigation

public DemoAdapter(ArrayList<String> dataset) {
  mDataset.clear();
  mDataset.addAll(dataset);
}

代码示例来源：origin: hankcs/HanLP

void finish()
{
  flush(0);
  _units.set(0, _nodes.get(0).unit());
  _labels.set(0, _nodes.get(0).label);
  _nodes.clear();
  _table.clear();
  _nodeStack.clear();
  _recycleBin.clear();
  _isIntersections.build();
}

代码示例来源：origin: ZieIony/Carbon

public ArrayList<MenuItem> getVisibleItems() {
  if (!mIsVisibleItemsStale) return mVisibleItems;
  // Refresh the visible items
  mVisibleItems.clear();
  final int itemsSize = mItems.size();
  MenuItem item;
  for (int i = 0; i < itemsSize; i++) {
    item = mItems.get(i);
    if (item.isVisible()) mVisibleItems.add(item);
  }
  mIsVisibleItemsStale = false;
  return mVisibleItems;
}

代码示例来源：origin: spotbugs/spotbugs

@NoWarning("NP_")
public static void falsePositive_ifnonull(List lst) {
  final ArrayList sections = new ArrayList();
  for (Object o : lst) {
    if (sections != null)
      sections.add(o);
  }
  sections.clear();
}

代码示例来源：origin: redisson/redisson

@SuppressWarnings("unchecked")
public <E> ArrayList<E> arrayList(int minCapacity) {
  ArrayList<E> list = (ArrayList<E>) arrayList;
  if (list == null) {
    arrayList = new ArrayList<Object>(minCapacity);
    return (ArrayList<E>) arrayList;
  }
  list.clear();
  list.ensureCapacity(minCapacity);
  return list;
}

代码示例来源：origin: libgdx/libgdx

public GradientPanel (GradientColorValue value, String name, String description, boolean hideGradientEditor) {
  super(value, name, description);
  this.value = value;
  initializeComponents();
  if (hideGradientEditor) {
    gradientEditor.setVisible(false);
  }
  gradientEditor.percentages.clear();
  for (float percent : value.getTimeline())
    gradientEditor.percentages.add(percent);
  gradientEditor.colors.clear();
  float[] colors = value.getColors();
  for (int i = 0; i < colors.length;) {
    float r = colors[i++];
    float g = colors[i++];
    float b = colors[i++];
    gradientEditor.colors.add(new Color(r, g, b));
  }
  if (gradientEditor.colors.isEmpty() || gradientEditor.percentages.isEmpty()) {
    gradientEditor.percentages.clear();
    gradientEditor.percentages.add(0f);
    gradientEditor.percentages.add(1f);
    gradientEditor.colors.clear();
    gradientEditor.colors.add(Color.white);
  }
  setColor(gradientEditor.colors.get(0));
}

代码示例来源：origin: apache/hbase

/**
 * Reads WALEdit from cells.
 * @param cellDecoder Cell decoder.
 * @param expectedCount Expected cell count.
 * @return Number of KVs read.
 */
public int readFromCells(Codec.Decoder cellDecoder, int expectedCount) throws IOException {
 cells.clear();
 cells.ensureCapacity(expectedCount);
 while (cells.size() < expectedCount && cellDecoder.advance()) {
  cells.add(cellDecoder.current());
 }
 return cells.size();
}

代码示例来源：origin: jMonkeyEngine/jmonkeyengine

public void update() {
  synchronized (eventQueue){
    // flush events to listener
    for (int i = 0; i < eventQueue.size(); i++){
      listener.onKeyEvent(eventQueue.get(i));
    }
    eventQueue.clear();
  }
}