Java for Fucking Idiots: Learn the Basics of Java Programming Without any experience!

When an array is created, Java must know the exact size it is and always
will be.
In the previous examples where we gave the array all its values when it was
created, Java knew the size, right? Remember this guy?
int
[] favoriteNumbers = {
6
, 
9
, 
420
};

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We told Java right off the bat there’s 3 things in this array, and here they
are.
But when we can’t give all the values at the beginning, then Java at least
needs to know the size!
That’s what the 
10
says; there will be 
10
things, or “elements” in this array.
The “new” part is saying you’re making a new array, and is just a required
word by Java.
We’ll get more into what new actually means later, but DON’T WORRY
ABOUT IT OKAY? CALM DOWN. REMAIN CALM.
Just know that with this line of code, we create a box with 10 empty slots in
it. Rejoice, and let’s keep going:
char
[] userFavoriteLetters =
new char
[
10
];
OH, one more thing. Very important.
You can tell how big your Array is using a very special “property” on the
array object, length . Remember properties? Variables that describe an
object? Well, arrays are objects so they can have properties, too.
For the 
userFavoriteLetters
array, what would the length be? Well, it would
be 
10
. Try it.
System.
out
.println(userFavoriteLetters.
length
);
It prints out 10. Very useful for later when we do loops, keep this in mind!
Putting shit in the box
“Well, the square brackets start comin’ and they don’t stop comin’ and they
don’t stop comin’…” – Smash Mouth
So, we’ve got an array with 10 slots. How do we put something in those
slots? No, that’s not a dirty innuendo.

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The answer is… we use the assignment operator (that’s the equals sign)
combined with square brackets to specify which slot in the box will be
assigned a value.
Check this out: