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How do getters and setters work?
...utorial is not really required for this. Read up on encapsulation
private String myField; //"private" means access to this is restricted
public String getMyField()
{
//include validation, logic, logging or whatever you like here
return this.myField;
}
public void setMyField(String value)
...
What is the 'instanceof' operator used for in Java?
...ific type...
if (objectReference instanceof type)
A quick example:
String s = "Hello World!"
return s instanceof String;
//result --> true
However, applying instanceof on a null reference variable/expression
returns false.
String s = null;
return s instanceof String;
//result --&...
Remove all special characters except space from a string using JavaScript
I want to remove all special characters except space from a string using JavaScript.
11 Answers
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Android: Create spinner programmatically from array
...
ArrayAdapter<String> should work.
i.e.:
Spinner spinner = new Spinner(this);
ArrayAdapter<String> spinnerArrayAdapter = new ArrayAdapter<String>
(this, android.R.layout.simple_spinner_item,
spinnerA...
Why would json_encode return an empty string
...coding problem
mb_detect_encoding returns probably a faulty response, some strings were probably not UTF-8
using utf8_encode() on those string solved my problem, but see note below
Here is a recursive function that can force convert to UTF-8 all the strings contained in an array:
function utf8iz...
C# Regex for Guid
I need to parse through a string and add single quotes around each Guid value. I was thinking I could use a Regex to do this but I'm not exactly a Regex guru.
...
Large Object Heap Fragmentation
... the LOH to preallocate a few objects (such as the array used for interned strings). Some of these are less than 85000 bytes and thus would not normally be allocated on the LOH.
It is an implementation detail, but I assume the reason for this is to avoid unnecessary garbage collection of instances...
How can I combine two HashMap objects containing the same types?
... values, so you'll need to use a loop or Map.forEach. Here we concatenate strings for duplicate keys:
map3 = new HashMap<>(map1);
for (Map.Entry<String, String> e : map2.entrySet())
map3.merge(e.getKey(), e.getValue(), String::concat);
//or instead of the above loop
map2.forEach((k...
A semantics for Bash scripts?
...are the scoping rules? What is the typing discipline, e.g. is everything a string? What is the state of the program -- is it a key-value assignment of strings to variable names; is there more than that, e.g. the stack? Is there a heap? And so on.
...
What is Func, how and when is it used
...pe to reference a method that returns some value of T. E.g.
public static string GetMessage() { return "Hello world"; }
may be referenced like this
Func<string> f = GetMessage;
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