Java Spark算子：filter

import org.apache.spark.SparkConf;
import org.apache.spark.api.java.JavaRDD;
import org.apache.spark.api.java.JavaSparkContext;
import org.apache.spark.api.java.function.Function;

import java.util.Arrays;
import java.util.List;

/**
 * filter（function）算子
 * 返回符合function函数条件的元素，构成一个新的RDD
 *
 */

public class FilterDemo {
    public static void main(String[] args) {

        SparkConf conf = new SparkConf().setMaster("local").setAppName("spark");
        JavaSparkContext sc = new JavaSparkContext(conf);
        List<String> list = Arrays.asList("tyd", "ttd", "tydd", "ttyy", "tddy", "tyty");
        JavaRDD<String> javaRDD = sc.parallelize(list);

        //filter算子的一般形式
        JavaRDD<String> javaRDD1 = javaRDD.filter(new Function<String, Boolean>() {
            @Override
            public Boolean call(String s) throws Exception {
                return s.contains("ty");
            }
        });
        System.out.println(javaRDD1.collect());

        //filter算子的lambda表达式形式
        JavaRDD<String> javaRDD2 = javaRDD.filter(s -> s.contains("dd"));
        System.out.println(javaRDD2.collect());

    }
}