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TI505M - Java 2: Generic, functional and concurrent programming

TI505M - Java 2: Generic, functional and concurrent programming

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An abstract class cannot have an explicit (coded) constructor.

True

False

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What is the output of the following program?

true

false

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Which definitions are true for overriding and overloading a method in Java?

Method overriding refers to the ability to provide a new implementation for a method in a subclass, that already exists in a superclass.

Method overloading refers to the ability to provide a new implementation for a method in a subclass, that already exists in a superclass.

Method overloading refers to the ability to have multiple methods with the same name within the same class, but with different parameter lists.

Method overriding refers to the ability to have multiple methods with the same name within the same class, but with different parameter lists.

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What is a copy constructor?

A constructor that takes as parameter an object of the same type as its current class, allowing to copy the values of its attributes.

A constructor explicitly defined by the developer in the class, and allowing to define specific values for the object’s properties when creating it.

A constructor that has no parameters and that is automatically created by the Java compiler if no other constructor has been explicitly defined in the class

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What is the output of the following program, if the file ”test.txt” does not exist?