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How do I generate random integers within a specific range in Java?
... to your range parameter (Max - Min) and then truncate the decimal part by casting to an int. This is accomplished via:
Min + (int)(Math.random() * ((Max - Min) + 1))
And there you have it. A random integer value in the range [Min,Max], or per the example [5,10]:
5 + (int)(Math.random() * ((10 -...
Check for null in foreach loop
...r and ForEach() which works faster than standard foreach loop.
You have to cast the collection to List though.
listOfItems?.ForEach(item => // ... );
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Can overridden methods differ in return type?
...er generates/uses plain classes for nested/inner classes, type erasure and casts for generics, synthetic accessors for nested/inner class private "friendship", synthetic instance fields for outer 'this' pointers, synthetic static fields for '.class' literals, etc, etc.
and covariant return types is...
Scala equivalent of Java java.lang.Class Object
... prevents me from passing in a Foo class by using Foo.getClass() without a cast.
Note: regarding getClass, a possible workaround would be:
class NiceObject[T <: AnyRef](x : T) {
def niceClass : Class[_ <: T] = x.getClass.asInstanceOf[Class[T]]
}
implicit def toNiceObject[T <: AnyRef](x ...
Java optional parameters
...You are type-checking for an Integer although your a variable is a String (cast is correct).
– Unknown Id
Feb 10 '16 at 10:59
5
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How can I initialise a static Map?
...t allow me to have a String key so I can't use unmodifiableMap(). I guess casting to a HashMap would defeat the purpose as well. Any ideas?
– Luke
May 4 '11 at 14:36
30
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Type converting slices of interfaces
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Try interface{} instead. To cast back as slice, try
func foo(bar interface{}) {
s := bar.([]string)
// ...
}
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Python - List of unique dictionaries
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@JorgeVidinha assuming each could be cast to str (or unicode), try this: {str(v['flight'])+':'+str(v['lon'])+','+str(v['lat']): v for v in stream}.values() This just creates a unique key based on your values. Like 'MH370:-21.474370,86.325589'
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How to wait for a number of threads to complete?
...tions. Depending on how you modify the provided example, you might need to cast the object turned by f.get() to your expected type.
– jt.
Jun 29 '16 at 4:41
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typeof !== “undefined” vs. != null
...rt of the window object, you can simply check against undefined instead of casting to a string and comparing strings.
On top of that, why are your variables not defined? I've seen a lot of code where they check a variables existence and perform some action based on that. Not once have I seen where...