Filter过滤算子

Filter过滤算子

代码

package com.it.flink.operators;

import org.apache.flink.api.common.functions.FilterFunction;
import org.apache.flink.streaming.api.datastream.DataStreamSource;
import org.apache.flink.streaming.api.datastream.SingleOutputStreamOperator;
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;

/*Filter过滤算子*/
public class FilterOp {
    public static void main(String[] args) throws Exception {
        StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();

        DataStreamSource<Integer> nums = env.fromElements(1, 2, 3, 4, 5, 6);

        //匿名
        SingleOutputStreamOperator<Integer> f1 = nums.filter(new FilterFunction<Integer>() {
            @Override
            public boolean filter(Integer value) throws Exception {
                return value % 2 == 0;
            }
        });

        //lambda
        SingleOutputStreamOperator<Integer> f2 = nums.filter(i -> i % 2 == 0);

        //lambda
        SingleOutputStreamOperator<Integer> f3 = nums.filter(i -> {
            return i % 2 == 0;
        });

        //sink
        f3.print();

        env.execute("FilterOp");

    }
}

scala代码

dataStream.filter { _ != 0 }