Intermediate level java quiz

What is the result of the following code? String s1 = "hello"; String s2 = new String("hello"); System.out.println(s1 == s2);

true

false

Compilation error

Runtime exception

Which of the following is true about method overloading in Java?

Methods can have the same name but must have different return types

Methods must have different names and return types to be overloaded

Methods can have the same name but must have different parameter types or number of parameters

Methods must have the same name and same parameter types

Which interface does Java's collection framework use to represent an ordered collection of elements?

Set

List

Queue

Map

What is the purpose of the `super` keyword in Java?

To call the constructor of the current class

To access the methods and variables of the superclass

To define a subclass constructor

To stop the current method execution

What will be the output of the following code? int x = 10; if (x > 5) { System.out.println("x is greater than 5"); } else { System.out.println("x is less than or equal to 5"); }

x is greater than 5

x is less than or equal to 5

Compilation error

Runtime exception

Which of the following classes is part of the Java Exception hierarchy?

String

Object

Throwable

Integer

What is the significance of the `final` keyword when applied to a method in Java?

The method can be overridden by subclasses

The method cannot be overridden by subclasses

The method cannot be called from other methods

The method will execute in constant time

What will happen if you try to access an element in a `List` using an index that is out of bounds?

It will return null

It will throw an `IndexOutOfBoundsException`

It will throw a `NullPointerException`

It will throw a `RuntimeException`

Which of the following is the correct way to declare a generic class in Java?

class MyClass<T> {}

class MyClass[] {}

class MyClass<T extends Object> {}

class MyClass<T extends Comparable> {}

What does the `transient` keyword do in Java?

Marks a variable as not to be serialized

Prevents a method from being overridden

Indicates a method is private

Makes a class final