筛选器Flink元组

import org.apache.flink.api.common.functions.FilterFunction;
import org.apache.flink.api.java.tuple.Tuple2;
import org.apache.flink.streaming.api.datastream.DataStream;
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;

public class TupleFilterExample {
    public static void main(String[] args) throws Exception {
        // 创建Flink执行环境
        final StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();

        // 创建一个包含元组的数据流
        DataStream<Tuple2<Integer, Integer>> inputStream = env.fromElements(
                new Tuple2<>(1, 2),
                new Tuple2<>(3, 4),
                new Tuple2<>(5, 6)
        );

        // 应用筛选器
        DataStream<Tuple2<Integer, Integer>> filteredStream = inputStream.filter(new FilterFunction<Tuple2<Integer, Integer>>() {
            @Override
            public boolean filter(Tuple2<Integer, Integer> value) throws Exception {
                // 这里定义筛选条件，例如只保留第一个元素大于2的元组
                return value.f0 > 2;
            }
        });

        // 打印结果
        filteredStream.print();

        // 执行Flink作业
        env.execute("Tuple Filter Example");
    }
}

(3,4)
(5,6)

DataStream<Tuple2<Integer, Integer>> filteredStream = inputStream.filter(value -> value.f0 > 2);