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Core Java - Interview Questions and Answers for 'Construction' - 2 question(s) found - Order By Newest

 Q1. What is the difference between declaration, instantiation and initialization ?Core Java
Ans. Declaration is intimation to the compiler about the nature of Data a reference is going to hold.

For example - List myList;

Instantiation is reservation of memory.

For example

myList = new ArrayList();

Initialization or construction is setting the default values for member elements.

For example

myList = new ArrayList(mySet);

** Example 2nd is both for instantiation as well as initialization. The only difference is that 2nd will initialized the member elements to their default values whereas 3rd will initialized it with the elements from set.

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   Like         Discuss         Correct / Improve     declaration   instantiation   initialization   construction   declaration vs instantiation   instantiation vs initialization   declaration vs initialization     Asked in 1 Companies      basic        frequent

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 Q2. Variable of the boolean type is automatically initialized as?Core Java
Ans. The default value of the boolean type is false.

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   Like         Discuss         Correct / Improve     java   data type   boolean   initialization   default object construction   default constructor   default value

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