Java 8 test, Java - rextester

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//'main' method must be in a class 'Rextester'.
//Compiler version 1.8.0_111

import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.stream.Collectors;

class Rextester
{  
    
	void process() {
		List<Fruit> fruits = new ArrayList<Fruit>(4);
		fruits.add(new Fruit(12, "Apple", "Gala"));
		fruits.add(new Fruit(12, "Apple", "Fuji"));
		fruits.add(new Fruit(13, "Orange", "Navel"));
		fruits.add(new Fruit(13, "Orange", "Valencia"));
				
		System.out.println("Input - " + fruits);
		
		Map<Integer, Map<String, Set<String>>> fruitsByIdByType = 
		           fruits.stream()
		            .collect(Collectors.groupingBy(Fruit::getId, Collectors.groupingBy(Fruit::getName, Collectors.mapping(Fruit::getType, Collectors.toSet()))));
		
		System.out.println("Output - " + fruitsByIdByType);		
	}
	
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		new Rextester().process();
	}
	
	public class Fruit {
		
		Fruit(int id, String name, String type) {
			this.id = id;
			this.name = name;
			this.type = type;
		}
		
		int id;
		String name;
		String type;
		
		public int getId() {
			return id;
		}
		public void setId(int id) {
			this.id = id;
		}
		public String getName() {
			return name;
		}
		public void setName(String name) {
			this.name = name;
		}
		public String getType() {
			return type;
		}
		public void setType(String type) {
			this.type = type;
		}
		
		public String toString() {
			return this.id + "\t" + this.name + "\t" + this.type + "\n";
		}
	}

}

[ + ] Show input
Compilation time: 0.82 sec, absolute running time: 0.24 sec, cpu time: 0.18 sec, memory peak: 25 Mb, absolute service time: 1,06 sec