package java7;
import com.sandwich.koan.Koan;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import static com.sandwich.koan.constant.KoanConstants.__;
import static com.sandwich.util.Assert.assertEquals;
public class AboutDiamondOperator {
@Koan
public void diamondOperator() {
String[] animals = {"Dog", "Cat", "Tiger", "Elephant", "Zebra"};
//Generic type of array list inferred - empty <> operator
List<String> animalsList = new ArrayList<>(Arrays.asList(animals));
assertEquals(animalsList, __);
}
@Koan
public void diamondOperatorInMethodCall() {
String[] animals = {"Dog", "Cat", "Tiger", "Elephant", "Zebra"};
//type of new ArrayList<>() inferred from method parameter
List<String> animalsList = fill(new ArrayList<>());
assertEquals(animalsList, __);
}
private List<String> fill(List<String> list) {
String[] animals = {"Dog", "Cat", "Tiger", "Elephant", "Zebra"};
list.addAll(Arrays.asList(animals));
return list;
}
}