本文整理了Java中org.apache.spark.api.java.JavaRDD.flatMapToDouble()方法的一些代码示例，展示了JavaRDD.flatMapToDouble()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。JavaRDD.flatMapToDouble()方法的具体详情如下：
包路径：org.apache.spark.api.java.JavaRDD
类名称：JavaRDD
方法名：flatMapToDouble

JavaRDD.flatMapToDouble介绍

暂无

代码示例

代码示例来源：origin: org.apache.spark/spark-core_2.11

@Test
public void flatMap() {
 JavaRDD<String> rdd = sc.parallelize(Arrays.asList("Hello World!",
  "The quick brown fox jumps over the lazy dog."));
 JavaRDD<String> words = rdd.flatMap(x -> Arrays.asList(x.split(" ")).iterator());
 Assert.assertEquals("Hello", words.first());
 Assert.assertEquals(11, words.count());
 JavaPairRDD<String, String> pairs = rdd.flatMapToPair(s -> {
  List<Tuple2<String, String>> pairs2 = new LinkedList<>();
  for (String word : s.split(" ")) {
   pairs2.add(new Tuple2<>(word, word));
  }
  return pairs2.iterator();
 });
 Assert.assertEquals(new Tuple2<>("Hello", "Hello"), pairs.first());
 Assert.assertEquals(11, pairs.count());
 JavaDoubleRDD doubles = rdd.flatMapToDouble(s -> {
  List<Double> lengths = new LinkedList<>();
  for (String word : s.split(" ")) {
   lengths.add((double) word.length());
  }
  return lengths.iterator();
 });
 Assert.assertEquals(5.0, doubles.first(), 0.01);
 Assert.assertEquals(11, pairs.count());
}

代码示例来源：origin: org.apache.spark/spark-core

@Test
public void flatMap() {
 JavaRDD<String> rdd = sc.parallelize(Arrays.asList("Hello World!",
  "The quick brown fox jumps over the lazy dog."));
 JavaRDD<String> words = rdd.flatMap(x -> Arrays.asList(x.split(" ")).iterator());
 Assert.assertEquals("Hello", words.first());
 Assert.assertEquals(11, words.count());
 JavaPairRDD<String, String> pairs = rdd.flatMapToPair(s -> {
  List<Tuple2<String, String>> pairs2 = new LinkedList<>();
  for (String word : s.split(" ")) {
   pairs2.add(new Tuple2<>(word, word));
  }
  return pairs2.iterator();
 });
 Assert.assertEquals(new Tuple2<>("Hello", "Hello"), pairs.first());
 Assert.assertEquals(11, pairs.count());
 JavaDoubleRDD doubles = rdd.flatMapToDouble(s -> {
  List<Double> lengths = new LinkedList<>();
  for (String word : s.split(" ")) {
   lengths.add((double) word.length());
  }
  return lengths.iterator();
 });
 Assert.assertEquals(5.0, doubles.first(), 0.01);
 Assert.assertEquals(11, pairs.count());
}

代码示例来源：origin: org.apache.spark/spark-core_2.10

@Test
public void flatMap() {
 JavaRDD<String> rdd = sc.parallelize(Arrays.asList("Hello World!",
  "The quick brown fox jumps over the lazy dog."));
 JavaRDD<String> words = rdd.flatMap(x -> Arrays.asList(x.split(" ")).iterator());
 assertEquals("Hello", words.first());
 assertEquals(11, words.count());
 JavaPairRDD<String, String> pairsRDD = rdd.flatMapToPair(s -> {
   List<Tuple2<String, String>> pairs = new LinkedList<>();
   for (String word : s.split(" ")) {
    pairs.add(new Tuple2<>(word, word));
   }
   return pairs.iterator();
  }
 );
 assertEquals(new Tuple2<>("Hello", "Hello"), pairsRDD.first());
 assertEquals(11, pairsRDD.count());
 JavaDoubleRDD doubles = rdd.flatMapToDouble(s -> {
  List<Double> lengths = new LinkedList<>();
  for (String word : s.split(" ")) {
   lengths.add((double) word.length());
  }
  return lengths.iterator();
 });
 assertEquals(5.0, doubles.first(), 0.01);
 assertEquals(11, pairsRDD.count());
}

代码示例来源：origin: org.apache.spark/spark-core

@Test
public void flatMap() {
 JavaRDD<String> rdd = sc.parallelize(Arrays.asList("Hello World!",
  "The quick brown fox jumps over the lazy dog."));
 JavaRDD<String> words = rdd.flatMap(x -> Arrays.asList(x.split(" ")).iterator());
 assertEquals("Hello", words.first());
 assertEquals(11, words.count());
 JavaPairRDD<String, String> pairsRDD = rdd.flatMapToPair(s -> {
   List<Tuple2<String, String>> pairs = new LinkedList<>();
   for (String word : s.split(" ")) {
    pairs.add(new Tuple2<>(word, word));
   }
   return pairs.iterator();
  }
 );
 assertEquals(new Tuple2<>("Hello", "Hello"), pairsRDD.first());
 assertEquals(11, pairsRDD.count());
 JavaDoubleRDD doubles = rdd.flatMapToDouble(s -> {
  List<Double> lengths = new LinkedList<>();
  for (String word : s.split(" ")) {
   lengths.add((double) word.length());
  }
  return lengths.iterator();
 });
 assertEquals(5.0, doubles.first(), 0.01);
 assertEquals(11, pairsRDD.count());
}

代码示例来源：origin: org.apache.spark/spark-core_2.10

@Test
public void flatMap() {
 JavaRDD<String> rdd = sc.parallelize(Arrays.asList("Hello World!",
  "The quick brown fox jumps over the lazy dog."));
 JavaRDD<String> words = rdd.flatMap(x -> Arrays.asList(x.split(" ")).iterator());
 Assert.assertEquals("Hello", words.first());
 Assert.assertEquals(11, words.count());
 JavaPairRDD<String, String> pairs = rdd.flatMapToPair(s -> {
  List<Tuple2<String, String>> pairs2 = new LinkedList<>();
  for (String word : s.split(" ")) {
   pairs2.add(new Tuple2<>(word, word));
  }
  return pairs2.iterator();
 });
 Assert.assertEquals(new Tuple2<>("Hello", "Hello"), pairs.first());
 Assert.assertEquals(11, pairs.count());
 JavaDoubleRDD doubles = rdd.flatMapToDouble(s -> {
  List<Double> lengths = new LinkedList<>();
  for (String word : s.split(" ")) {
   lengths.add((double) word.length());
  }
  return lengths.iterator();
 });
 Assert.assertEquals(5.0, doubles.first(), 0.01);
 Assert.assertEquals(11, pairs.count());
}

代码示例来源：origin: org.apache.spark/spark-core_2.11

@Test
public void flatMap() {
 JavaRDD<String> rdd = sc.parallelize(Arrays.asList("Hello World!",
  "The quick brown fox jumps over the lazy dog."));
 JavaRDD<String> words = rdd.flatMap(x -> Arrays.asList(x.split(" ")).iterator());
 assertEquals("Hello", words.first());
 assertEquals(11, words.count());
 JavaPairRDD<String, String> pairsRDD = rdd.flatMapToPair(s -> {
   List<Tuple2<String, String>> pairs = new LinkedList<>();
   for (String word : s.split(" ")) {
    pairs.add(new Tuple2<>(word, word));
   }
   return pairs.iterator();
  }
 );
 assertEquals(new Tuple2<>("Hello", "Hello"), pairsRDD.first());
 assertEquals(11, pairsRDD.count());
 JavaDoubleRDD doubles = rdd.flatMapToDouble(s -> {
  List<Double> lengths = new LinkedList<>();
  for (String word : s.split(" ")) {
   lengths.add((double) word.length());
  }
  return lengths.iterator();
 });
 assertEquals(5.0, doubles.first(), 0.01);
 assertEquals(11, pairsRDD.count());
}