java - Apache Spark : How can i access nested array of integers within Tuple2 object in Java?

Question

我是 Spark 新手，我正在尝试执行单词到计数和错误的映射，以实现空间节省算法。对于每个单词，我需要保留它的计数和错误。我的代码如下。问题是我无法访问 tuple2 中整数数组中的元素。

JavaPairRDD<String, Integer[]> ones = words.mapToPair(new PairFunction<String, String, Integer[]>() {
        @Override
        public Tuple2<String, Integer[]> call(String s) {
            Integer[] defaults = {1,0};
            return new Tuple2<String, Integer[]>(s, defaults);
        }
    });

    List<Tuple2<String,Integer[]>> output = ones.collect();

    for (Tuple2<?, ?> tuple : output) {
        Integer temp = (Integer) tuple._2()[0];  ///ERROR, HOW CAN I ACCESS ARRAY ELEMENT???
        System.out.println(tuple._1() + ": " + tuple._2()+" "+temp[0]);
    }

Answer 1

更改此:

for (Tuple2<?, ?> tuple : output) {
    Integer temp = (Integer) tuple._2()[0];  ///ERROR, HOW CAN I ACCESS ARRAY ELEMENT???
    System.out.println(tuple._1() + ": " + tuple._2()+" "+temp[0]);
}

至

for (Tuple2<String, Integer[]> tuple : output) {
    Integer temp = tuple._2()[0];
    System.out.println(tuple._1() + ": " + tuple._2() + " " + temp[0]);
}