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How can I convert immutable.Map to mutable.Map in Scala?
...> "one", 2 -> "two")
//iMap: scala.collection.immutable.Map[Int,java.lang.String] = Map((1,one), (2,two))
scala> val mMap = new HashMap[Int,String] {
| override def default(key: Int): String = iMap(key)
| }
//mMap: scala.collection.mutable.HashMap[Int,String] = Map()
scala...
Why does int num = Integer.getInteger(“123”) throw NullPointerException?
...nt) 123, you can use e.g. int Integer.parseInt(String).
References
Java Language Guide/Autoboxing
Integer API references
static int parseInt(String)
static Integer getInteger(String)
On Integer.getInteger
Here's what the documentation have to say about what this method does:
public s...
How many constructor arguments is too many?
...gal or inappropriate argument." see docs.oracle.com/javase/7/docs/api/java/lang/…)
– Grmpfhmbl
May 4 '17 at 13:27
...
Duplicate ID, tag null, or parent id with another fragment for com.google.android.gms.maps.MapFragme
...r view resolved the issue. See this SO answer.
– theblang
Apr 30 '14 at 16:24
Very useful answer. How can we do a call...
Coding in Other (Spoken) Languages
...from, say Japan, writes code, would I be able to read it in English? Or do languages, like C, PHP, anything, have Japanese translations that they write?
...
What integer hash function are good that accepts an integer hash key?
...That's actually the implementation by Sun of the method hashCode() in java.lang.Integer grepcode.com/file/repository.grepcode.com/java/root/jdk/openjdk/…
– Juande Carrion
Oct 4 '12 at 16:56
...
What is the difference between NULL, '\0' and 0?
...
Note: This answer applies to the C language, not C++.
Null Pointers
The integer constant literal 0 has different meanings depending upon the context in which it's used. In all cases, it is still an integer constant with the value 0, it is just described in...
Why don't Java Generics support primitive types?
...e way that they do ... at least in part ... because they were added to the language a number of years after the language was designed1. The language designers were constrained in their options for generics by having to come up with a design that was backwards compatible with the existing language a...
Using a strategy pattern and a command pattern
...mplement undo and redo functionality
Maintain a history of commands
java.lang.Thread is one good implementation of Command pattern. You can treat Thread as invoker & class implementing Runnable as ConcreteCommonad/Receiver and run() method as Command.
Undo/Redo version of command pattern can ...
Why does this code segfault on 64-bit architecture but work fine on 32-bit?
...n used different registers for returning pointers than integers)
The comp.lang.c FAQ has an entry discussing why casting the return from malloc is never needed and potentially bad.
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