Spark Flatmap-将Scala转换为Java代码

Question

I have been practising spark. I am not very familiar with scala and want to try the java code. For the below basic operations of map and flatmap, how do i write the below code in java

sc.parallelize(List(1,2,3)).flatMap(x=>List(x,x,x)).collect
sc.parallelize(List(1,2,3)).map(x=>List(x,x,x)).collect

Answer 1

It's basically the same:

sc.parallelize(Arrays.asList(1,2,3)).flatMap(x->Arrays.asList(x,x,x).iterator()).collect();
sc.parallelize(Arrays.asList(1,2,3)).map(x->Arrays.asList(x,x,x)).collect();

where sc is a JavaSparkContext (and assuming you use Java 8 and Spark 2.0.0).