TesteMap.java

import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;
import java.util.stream.Stream;

public class TesteMap {

	public static void main(String[] args) {
		List<Integer> nums = new ArrayList<Integer>(); 
		for(int i = 0; i < 50; i++)
			nums.add(i);
		
		
		// change 'stream()' to 'parallelStream()'
		Stream<Integer> st = nums.stream().map(x -> { System.out.println("A " + x); return x;} )
		.filter(x -> { System.out.println("B " + x); return true; } )
		.map(x -> { System.out.println("C " + x); return x; } );
		
		System.out.println("lazy...");
		
		st.collect(Collectors.toList());
	}
}