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What is the difference between Serializable and Externalizable in Java?
What is the difference between Serializable and Externalizable in Java?
11 Answers
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unsigned int vs. size_t
...rs for C string functions to the STL. I am curious as to the reason for this and the benefits it brings.
8 Answers
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How do I apply the for-each loop to every character in a String?
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The easiest way to for-each every char in a String is to use toCharArray():
for (char ch: "xyz".toCharArray()) {
}
This gives you the conciseness of for-each construct, but unfortunately String (which is immutable) must perform a defensive copy to generate the char[] (whic...
What is the size of ActionBar in pixels?
...actionBarSize
or if you're an ActionBarSherlock or AppCompat user, use this
?attr/actionBarSize
If you need this value at runtime, use this
final TypedArray styledAttributes = getContext().getTheme().obtainStyledAttributes(
new int[] { android.R.attr.actionBarSize });
mActi...
How to check if a file is a valid image file?
...rs will be a magic number for various file formats. You could check for this in addition to your exception checking above.
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Querying DynamoDB by date
...nswer:
DynamoDB allows for specification of secondary indexes to aid in this sort of query. Secondary indexes can either be global, meaning that the index spans the whole table across hash keys, or local meaning that the index would exist within each hash key partition, thus requiring the hash key...
Abstract classes in Swift Language
Is there a way to create an abstract class in the Swift Language, or is this a limitation just like Objective-C? I'd like to create a abstract class comparable to what Java defines as an abstract class.
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jQuery see if any or no checkboxes are selected
I know how to see if an individual checkbox is selected or not.
8 Answers
8
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What is “the inverse side of the association” in a bidirectional JPA OneToMany/ManyToOne association
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To understand this, you must take a step back. In OO, the customer owns the orders (orders are a list in the customer object). There can't be an order without a customer. So the customer seems to be the owner of the orders.
But in the SQL w...
Check if character is number?
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You could use comparison operators to see if it is in the range of digit characters:
var c = justPrices[i].substr(commapos+2,1);
if (c >= '0' && c <= '9') {
// it is a number
} else {
// it isn't
}
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