本文整理了Java中java.util.Deque.getFirst()方法的一些代码示例，展示了Deque.getFirst()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。Deque.getFirst()方法的具体详情如下：
包路径：java.util.Deque
类名称：Deque
方法名：getFirst

Deque.getFirst介绍

[英]Retrieves, but does not remove, the first element of this deque. This method differs from #peekFirst only in that it throws an exception if this deque is empty.
[中]检索但不删除此数据块的第一个元素。此方法与#peek first的不同之处在于，如果此deque为空，则会引发异常。

代码示例

代码示例来源：origin: google/j2objc

@Override
public E getFirst() {
 synchronized (mutex) {
  return delegate().getFirst();
 }
}

代码示例来源：origin: btraceio/btrace

@Override
public synchronized V getFirst() {
  return delegate.getFirst();
}

代码示例来源：origin: google/guava

@Override
public E getFirst() {
 synchronized (mutex) {
  return delegate().getFirst();
 }
}

代码示例来源：origin: google/guava

@Override
public E getFirst() {
 return delegate().getFirst();
}

代码示例来源：origin: Atmosphere/atmosphere

@Override
public boolean ready() throws IOException {
  // assuming no other thread is concurrently reading
  if (readers.isEmpty()) {
    return false;
  }
  return readers.getFirst().ready();
}

代码示例来源：origin: prestodb/presto

@Override
public E getFirst() {
 synchronized (mutex) {
  return delegate().getFirst();
 }
}

代码示例来源：origin: prestodb/presto

@Override
public E getFirst() {
 return delegate().getFirst();
}

代码示例来源：origin: google/j2objc

@Override
public E getFirst() {
 return delegate().getFirst();
}

代码示例来源：origin: google/guava

@Override
public E getFirst() {
 assertTrue(Thread.holdsLock(mutex));
 return delegate.getFirst();
}

代码示例来源：origin: SonarSource/sonarqube

@Override
public T current() {
 return deque.getFirst().getElement();
}

代码示例来源：origin: wildfly/wildfly

@Override
public E getFirst() {
 synchronized (mutex) {
  return delegate().getFirst();
 }
}

代码示例来源：origin: wildfly/wildfly

@Override
public String findSessionId(final HttpServerExchange exchange) {
  Deque<String> stringDeque = exchange.getPathParameters().get(name);
  if (stringDeque == null) {
    return null;
  }
  UndertowLogger.SESSION_LOGGER.tracef("Found path parameter session id %s on %s", stringDeque.getFirst(), exchange);
  return stringDeque.getFirst();
}

代码示例来源：origin: apache/hive

@Override
public Builder startOr() {
 ExpressionTree node = new ExpressionTree(ExpressionTree.Operator.OR);
 currentTree.getFirst().getChildren().add(node);
 currentTree.addFirst(node);
 return this;
}

代码示例来源：origin: apache/hive

@Override
public Builder startNot() {
 ExpressionTree node = new ExpressionTree(ExpressionTree.Operator.NOT);
 currentTree.getFirst().getChildren().add(node);
 currentTree.addFirst(node);
 return this;
}

代码示例来源：origin: apache/kafka

/**
 * Get a list of batches which have been sitting in the accumulator too long and need to be expired.
 */
public List<ProducerBatch> expiredBatches(long now) {
  List<ProducerBatch> expiredBatches = new ArrayList<>();
  for (Map.Entry<TopicPartition, Deque<ProducerBatch>> entry : this.batches.entrySet()) {
    // expire the batches in the order of sending
    Deque<ProducerBatch> deque = entry.getValue();
    synchronized (deque) {
      while (!deque.isEmpty()) {
        ProducerBatch batch = deque.getFirst();
        if (batch.hasReachedDeliveryTimeout(deliveryTimeoutMs, now)) {
          deque.poll();
          batch.abortRecordAppends();
          expiredBatches.add(batch);
        } else {
          maybeUpdateNextBatchExpiryTime(batch);
          break;
        }
      }
    }
  }
  return expiredBatches;
}

代码示例来源：origin: apache/hive

@Override
public Builder startAnd() {
 ExpressionTree node = new ExpressionTree(ExpressionTree.Operator.AND);
 currentTree.getFirst().getChildren().add(node);
 currentTree.addFirst(node);
 return this;
}

代码示例来源：origin: apache/hive

@Override
public Builder literal(TruthValue truth) {
 ExpressionTree parent = currentTree.getFirst();
 parent.getChildren().add(new ExpressionTree(truth));
 return this;
}

代码示例来源：origin: spring-projects/spring-framework

/**
 * Eat an identifier, possibly qualified (meaning that it is dotted).
 * TODO AndyC Could create complete identifiers (a.b.c) here rather than a sequence of them? (a, b, c)
 */
private SpelNodeImpl eatPossiblyQualifiedId() {
  Deque<SpelNodeImpl> qualifiedIdPieces = new ArrayDeque<>();
  Token node = peekToken();
  while (isValidQualifiedId(node)) {
    nextToken();
    if (node.kind != TokenKind.DOT) {
      qualifiedIdPieces.add(new Identifier(node.stringValue(), node.startPos, node.endPos));
    }
    node = peekToken();
  }
  if (qualifiedIdPieces.isEmpty()) {
    if (node == null) {
      throw internalException( this.expressionString.length(), SpelMessage.OOD);
    }
    throw internalException(node.startPos, SpelMessage.NOT_EXPECTED_TOKEN,
        "qualified ID", node.getKind().toString().toLowerCase());
  }
  return new QualifiedIdentifier(qualifiedIdPieces.getFirst().getStartPosition(),
      qualifiedIdPieces.getLast().getEndPosition(), qualifiedIdPieces.toArray(new SpelNodeImpl[0]));
}

代码示例来源：origin: apache/hive

@Override
public Builder isNull(String column, PredicateLeaf.Type type) {
 ExpressionTree parent = currentTree.getFirst();
 if (column == null) {
  parent.getChildren().add(new ExpressionTree(TruthValue.YES_NO_NULL));
 } else {
  PredicateLeaf leaf =
    new PredicateLeafImpl(PredicateLeaf.Operator.IS_NULL,
      type, column, null, null, conf);
  parent.getChildren().add(new ExpressionTree(addLeaf(leaf)));
 }
 return this;
}

代码示例来源：origin: google/guava

create().pollFirst();
create().pollLast();
create().getFirst();
create().getLast();
create().peekFirst();