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Java 1 (012026-ANP)
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Find the output:
import java.util.*;
public class Main { public static void main(String[] args) { List<String> list = Arrays.asList("A", "B"); List<?> obj = list;
System.out.println(obj.get(1)); }}
Find the output
import java.util.*;public class Main {public static void main(String[] args) {List<Double> list = new ArrayList<>();list.add(4.4);List<? extends Number> obj = list;System.out.println(obj.get(0).getClass().getSimpleName());}}Find the output:
import java.util.*;
public class Main { public static void main(String[] args) { List<Double> list = Arrays.asList(1.5, 2.5, 3.5); List<? extends Number> obj = list;
Number n = obj.get(2); System.out.println(n); }}
Find the output:
import java.util.*;
public class Main { public static void main(String[] args) { List<Integer> list = new ArrayList<>(); List<? extends Number> obj = list;
obj.add(100); System.out.println(obj); }}
What can you add to List<?>?
Which wildcard is used to read data safely?
Which wrapper class should be used instead of int in generics?
Which one is true about generics and primitive types?
Which declaration allows only Number or its subclasses?
What does extends mean in bounded generics?