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TI505M - Java 2: Generic, functional and concurrent programming

TI505M - Java 2: Generic, functional and concurrent programming

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If a class B inherits from a class A, and A and B do not have an explicit (coded) constructor. When creating an object B :

The object B is created, the attributes of A and B are allocated in memory and initialized by default

✅

A runtime error occurs because A and B do not have a constructor

❌

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What is the output of the following Java code?

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After one or more try/catch blocks, a finally block is mandatory

True

False

100%

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What is the correct output for this code?

G = 3.14

G = 3.14

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What is the output of the following program?

alpha beta b b

beta alpha b b

alpha beta a b

100%

beta alpha a b

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

True

100%

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?