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Why XML-Serializable class need a parameterless constructor
...n, the XmlSerializer class will need to create
instances of your type.
In order to create an instance of a type, a constructor of that type
needs to be invoked.
If you did not declare a constructor, the compiler has already
supplied a default parameterless constructor, but if you did declare
a con...
Entity Framework rollback and remove bad migration
...t;"
All migrations applied after the one specified will be down-graded in order starting with the latest migration applied first.
Step 2: Delete your migration from the project
remove-migration name_of_bad_migration
If the remove-migration command is not available in your version of Entity Framewo...
Why create “Implicitly Unwrapped Optionals”, since that implies you know there's a value?
...iewDidLoad() you can assume that properties generally exist. Otherwise, in order to satisfy the compiler, you had to be using the
forced unwrapping,
optional binding
or optional chaining
only to obscure the main purpose of the code.
Above part from the Swift book refers also to the Automatic Re...
How to fix java.lang.UnsupportedClassVersionError: Unsupported major.minor version
...er to create code compatible with earlier Java versions.
For example, in order to generate class files compatible with Java 1.4, use the following command line:
javac -target 1.4 HelloWorld.java
With newer versions of the Java compiler you are likely to get a warning about the bootstrap class p...
Why do == comparisons with Integer.valueOf(String) give different results for 127 and 128?
...tring s) throws NumberFormatException
Explanation for comparison:
In order to save memory, two instances of the
wrapper objects , will always be == when their
primitive values are the same:
Boolean
Byte
Character from \u0000 to \u007f (7f is 127 in decimal)
Short and Integer ...
How can I find the length of a number?
...
You have to make the number to string in order to take length
var num = 123;
alert((num + "").length);
or
alert(num.toString().length);
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Selecting and manipulating CSS pseudo-elements such as ::before and ::after using jQuery
...
We can also rely on custom properties (aka CSS variables) in order to manipulate pseudo-element. We can read in the specification that:
Custom properties are ordinary properties, so they can be declared on
any element, are resolved with the normal inheritance and cascade
rules,...
Set opacity of background image without affecting child elements
... I think you need to change the ” quotes in the above code to " in order for it to work when straight copy-pasted.
– nsantorello
Feb 6 '12 at 16:44
6
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In which case do you use the JPA @JoinTable annotation?
...solution in JPA you need to use the @JoinTable annotation. For example, in order to implement a uni-directional one-to-many association, we can define our entities as such:
Project entity:
@Entity
public class Project {
@Id
@GeneratedValue
private Long pid;
private String name;
...
How can I convert a zero-terminated byte array to string?
...
What if your byte array is in the reverse order aka little endian?
– Sir
Nov 22 '17 at 0:39
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