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Convert JSON to Map
...r. :-)
For such a simple mapping, most tools from http://json.org (section java) would work.
For one of them (Jackson https://github.com/FasterXML/jackson-databind/#5-minute-tutorial-streaming-parser-generator), you'd do:
Map<String,Object> result =
new ObjectMapper().readValue(JSON_SO...
What are enums and why are they useful?
...ulation above does not give you is nice switch cases. For enum types, the Java switch uses the type of its variable to infer the scope of enum cases, so for the enum Color above you merely need to say:
Color color = ... ;
switch (color) {
case RED:
...
break;
}
Note it's not ...
How can I create tests in Android Studio?
...sts that you will do.
Local unit tests. These are run locally on the JVM (Java Virtual Machine). Since they are local, they are fast. You can use them to test the parts of your code that just need Java and not the Android APIs. (Sometimes you can make a fake API object to test more things locally. ...
What is the significance of load factor in HashMap?
...has two important properties: size and load factor . I went through the Java documentation and it says 0.75f is the initial load factor. But I can't find the actual use of it.
...
Load image from url
...[0];
Bitmap mIcon11 = null;
try {
InputStream in = new java.net.URL(urldisplay).openStream();
mIcon11 = BitmapFactory.decodeStream(in);
} catch (Exception e) {
Log.e("Error", e.getMessage());
e.printStackTrace();
}
return mIcon11;
}...
What is meant by immutable?
...be the dumbest question ever asked but I think it is quite confusing for a Java newbie.
17 Answers
...
What causes a java.lang.ArrayIndexOutOfBoundsException and how do I prevent it?
...add that for multidimensional arrays that might have an arbitrary shape in Java, the nested loops should check for the relevant subarray length: for (int nestedIndex = 0; nestedIndex < array[outerIndex].length; nestedIndex++) { ... array[outerIndex][nestedIndex] ... }.
– And...
Why is C so fast, and why aren't other languages as fast or faster? [closed]
...tic typing of variables.
That said, many languages and platforms, such as Java (with its Java Virtual Machine) and .NET (with its Common Language Runtime) have improved performance over the years with advents such as just-in-time compilation which produces native machine code from bytecode to achie...
STL or Qt containers?
...when using meta-types or signals and slots.
can use STL-style iterators or Java-style iterators
are streamable with QDataStream
are used extensively in Qt's API
have a stable implementation across operating systems. A STL implementation must obey the C++ standard, but
is otherwise free to do as it p...
How can I convert byte size into a human-readable format in Java?
How can I convert byte size into a human-readable format in Java?
25 Answers
25
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