What is the purpose of default constructor?

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The java compiler creates a default constructor only if there is no constructor in the class.

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124. Can a constructor be made final?

Answer: No, this is not possible.

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126. Define composition?

Answer: Holding the reference of the other class within some other class is known as composition.

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Answer: If a class has multiple functions by same name but different parameters, it is known as Method Overloading.

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128. What is Method/function overriding?

Answer: If a subclass provides a specific implementation of a method that is already provided by its parent class, it is known as Method Overriding.

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129. Difference between Overloading and Overriding?

Answer: Method overloading increases the readability of the program. Method overriding provides the specific implementation of the method that is already provided by its super class parameter must be different in case of overloading, parameter must be same in case of overriding.

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131. What is NullPointerException?

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132. What are the ways in which a thread can enter the waiting state?

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133. How does multi-threading take place on a computer with a single CPU?

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