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When would you use a WeakHashMap or a WeakReference?
...1.4.2 and 1.5, I could have fixed it by subclassing every component I was interested int (JButton, JFrame, JPanel....) but this was much easier with much less code.
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What are the relationships between Any, AnyVal, AnyRef, Object and how do they map when used in Java
...yVal are classes. But they don't appear as classes in bytecode, because of intrinsic limitations of the JVM.
This arises out of the fact that not everything in Java is an object. In addition to objects, there are primitives. All objects in Java are descendant from java.lang.Object, but primitives a...
Literal notation for Dictionary in C#?
... { "test2", "val2" }
};
In C# 6, you now have the option of using a more intuitive syntax with Dictionary as well as any other type that supports indexers. The above statement can be rewritten as:
var data = new Dictionary<string, string>
{
["test"] = "val",
["test2"] = "val2"
};
...
Entity framework linq query Include() multiple children entities
... }
public static Company CompanyById(this NameOfContext context, int companyID){
return context.Companies
.Include("Employee.Employee_Car")
.Include("Employee.Employee_Country")
.FirstOrDefault(c => c.Id == companyID) ;
}
}
Then y...
SQL update trigger only when column is modified
...ded to use the deleted table. I ended up writing to a separate table (to maintain a history).
– Walter de Jong
Aug 28 '12 at 1:58
9
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iOS 6 apps - how to deal with iPhone 5 screen size? [duplicate]
...today's presentation. They will be letterboxed or basically the extra 88 points in height would simply be black.
If you only plan to support iOS 6+, then definitely consider using Auto Layout. It removes all fixed layout handling and instead uses constraints to lay things out. Nothing will be hard-...
Objective-C for Windows
...hey should make a new badge for bs answers. No offense @michael. It's an interesting read.
– Wolfpack'08
May 13 '15 at 15:15
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How to form tuple column from two columns in Pandas
... lists rather than tuples)
import pandas as pd
import numpy as np
size = int(1e+07)
df = pd.DataFrame({'a': np.random.rand(size), 'b': np.random.rand(size)})
%timeit df.values.tolist()
1.47 s ± 38.9 ms per loop (mean ± std. dev. of 7 runs, 1 loop each)
%timeit list(zip(df.a,df.b))
1.92 s ± 1...
How does the “final” keyword in Java work? (I can still modify an object.)
...eference foo is binded to just one final object of ArrayList...it cannot point to any other ArrayList
– Code2Interface
Mar 27 '13 at 9:08
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What is the overhead of creating a new HttpClient per call in a WebAPI client?
...ltiple threads.
The HttpClientHandler has Credentials and Cookies that are intended to be re-used across calls. Having a new HttpClient instance requires re-setting up all of that stuff.
Also, the DefaultRequestHeaders property contains properties that are intended for multiple calls. Having to re...