What will be the output of the following code?
List<String> list = new ArrayList<>();
list.add("Java");
System.out.println(list.get(0).length());
Q.202Easy
Which of the following is a valid generic method declaration?
Q.203Easy
What is the output of this generic code?
class Pair<K, V> {
public void display(K key, V value) {
System.out.println(key + ": " + value);
}
}
Pair<String, Integer> p = new Pair<>();
p.display("Age", 25);
Q.204Easy
In Java generics, what does the wildcard '?' represent?
Q.205Easy
What is the primary advantage of using generics in Java?
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Q.206Easy
Which of the following will compile successfully?
Q.207Easy
What is the output of this code snippet?
ArrayList<String> list = new ArrayList<>();
list.add("Java");
Object obj = list.get(0);
String str = (String) obj;
System.out.println(str.length());
Q.208Easy
In the interface declaration 'interface Pair<K, V>', how many type parameters does it have?
Q.209Easy
Which of the following is a valid generic method declaration in Java?
Q.210Easy
What is the primary purpose of bounded type parameters in generics?
Q.211Easy
What will be the result of executing: List<Integer> list = new ArrayList<String>();
Q.212Easy
What is the output of the following code?
List<Integer> list = new ArrayList<Integer>();
list.add(10);
Object obj = list.get(0);
System.out.println(obj.getClass().getName());
Q.213Easy
What is the advantage of using generics over raw types in terms of 2024-25 Java standards?
Q.214Easy
Which of the following is a valid generic class declaration in Java?
Q.215Easy
What is the result of type erasure in Java generics?
Q.216Easy
What is the compiler-inferred type parameter in this call?
List<String> list = Arrays.asList("a", "b", "c");
Q.217Easy
What does the wildcard in List<?> represent?
Q.218Easy
What is the relationship between generics and arrays in Java?
Q.219Easy
What will be the output of the following code?
java
List<String> list = new ArrayList<String>();
list.add("Java");
Object obj = list;
System.out.println(list.getClass() == obj.getClass());
Q.220Easy
Which of the following correctly declares a generic method that returns the first element of any collection?
