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Constructors.

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The constructors are special methods with special declarations.

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So construction declarations don't state a return type and their name matches the class name.

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So, for example, here, let's create an constructor of this class, my date and time to my date and

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time.

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And this is our constructor and assign it to year here.

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2019.

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Here and let's.

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The letter here, quote Here my date and my date and time clock here and print this clock here.

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So as you remember, we didn't we won't assign anything on clock and you will see what happens then.

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So let's print the hour clock here, as you can see here.

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So.

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Time is here.

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And the time.

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This is the year.

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The year is.

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Here and then we will pass clock dot get here method.

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So.

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Here.

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So the new constructor here, as you can see here, the new constructors.

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Yeah.

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Then the new constructor here takes a single year, takes a single year as a parameter.

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So actually let me write the parameter here.

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Integer year in and we will assign this year in or if set year.

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Is year in.

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Then here it comes to 2019.

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So.

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And as you can see, we need to match infrastructure initialization.

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So we need to add something, add a year variable because the constructors need a parameter here.

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So.

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For example, 2020.

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Here.

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And we can as you can see, we don't have any errors in the code.

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So here takes a single year in argument of type integer here.

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So you call the set year.

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Here's Seth here with year in.

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So if Seth here returns false the caller provided bad input and you override year end with a default

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value of 2019.

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So in main here you make a clock within the new constructor and then print the result.

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So the continuation of the my date and time clock year 2020 20 is called an initialization.

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Beer.

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So you might not like the idea that.

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Invalid year that in instances where slide silently corrected to 2019.

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I don't like it either.

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So exceptions solve this problem.

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So you will learn about them in next lectures about exceptions here.