Which of the following appear in a method's signature? Mark all that apply

Answer 1

1. Method name
2. Return type
3. Parameter types
4. Access modifier
5. Exception types

The correct answers are 1, 2, 3, and 4. The method name, return type, parameter types, and access modifier appear in a method's signature. Exception types are not part of the method's signature, but they may be part of the method's declaration or definition.

Answer 2

Which of the following is a variable's scope in a Java library?

Answer 3

The possible scopes for variables in a Java library are:

1. Local scope
2. Instance scope (also known as object scope)
3. Class scope (also known as static scope)

These scopes determine the accessibility and lifespan of a variable within a Java library.

Answer 4

What does a constructor return?

Answer 5

A constructor does not explicitly return a value. In Java, a constructor is a special method that is used to initialize objects of a class. It has the same name as the class and does not have a return type, not even void.

When you create an instance of a class using the new keyword and the class's constructor, the constructor is invoked to initialize the object's state. It sets up the initial values of the object's instance variables. The constructed object is then returned as the result of the constructor invocation.