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Different names of JSON property during serialization and deserialization
...s different fields, not as one field.
Here is test code:
Coordinates c = new Coordinates();
c.setRed((byte) 5);
ObjectMapper mapper = new ObjectMapper();
System.out.println("Serialization: " + mapper.writeValueAsString(c));
Coordinates r = mapper.readValue("{\"red\":25}",Coordinates.class);
Syst...
How can I move a tag on a git branch to a different commit?
...have to use forced push, if the tag reference can be fast forwarded to the new place.
– GergelyPolonkai
Nov 25 '14 at 11:12
11
...
Find an item in List by LINQ?
... what you want):
string search = "lookforme";
List<string> myList = new List<string>();
string result = myList.Single(s => s == search);
Note SingleOrDefault() will behave the same, except it will return null for reference types, or the default value for value types, instead of thr...
How can I read a large text file line by line using Java?
...
A common pattern is to use
try (BufferedReader br = new BufferedReader(new FileReader(file))) {
String line;
while ((line = br.readLine()) != null) {
// process the line.
}
}
You can read the data faster if you assume there is no character encoding. e.g. A...
How do I clone a Django model instance object and save it to the database?
...pk>)
obj.pk = None
obj.save()
If you want auto-generated key, set the new key to None.
More on UPDATE/INSERT here.
Official docs on copying model instances: https://docs.djangoproject.com/en/2.2/topics/db/queries/#copying-model-instances
...
Why are my PowerShell scripts not running?
... What's the default ExecutionPolicy value that Windows sets a new installation to?
– Matthew Lock
May 17 '17 at 6:38
5
...
What's the difference between Ruby's dup and clone methods?
...
First, clone copies the singleton class, while dup does not.
o = Object.new
def o.foo
42
end
o.dup.foo # raises NoMethodError
o.clone.foo # returns 42
Second, clone preserves the frozen state, while dup does not.
class Foo
attr_accessor :bar
end
o = Foo.new
o.freeze
o.dup.bar = 10 # ...
ASP.NET MVC Relative Paths
...
While an old post, new readers should know that Razor 2 and later (default in MVC4+) completely resolves this problem.
Old MVC3 with Razor 1:
<a href="@Url.Content("~/Home")">Application home page</a>
New MVC4 with Razor 2 and l...
How to launch an Activity from another Application in Android
...
It starts a new Intent , how about resuming the application which is in background?
– Salil Dua
Jul 29 '13 at 10:02
3...
Returning value from Thread
... CountDownLatch:
public void test()
{
final CountDownLatch latch = new CountDownLatch(1);
final int[] value = new int[1];
Thread uiThread = new HandlerThread("UIHandler"){
@Override
public void run(){
value[0] = 2;
latch.countDown(); // Release...