While reading about Java Programming I couldn't get why it states Java static main necessity reason is because " before you're program starts, there aren't any objects to send messages to " as said in slide 8 of static variables.
32.
Does static allow a variable to be referenced through " all " instances of a class ( so say variable is a static variable in a class TestClass, to reference the " global " variable will be TestClass . variable, but for an instance, test . variable ? ).
33.
These do not have analogous language-level concepts for variables : variable lifetime ends implicitly ( for automatic variables, on stack unwind; for static variables, on program termination ), and at this time ( or later, depending on implementation ) memory is deallocated, but no finalization is done in general.
34.
Except for having a wrapper function with a static variable to test that the " real " function I wanted called is only run the second time the browser calls it, is there any other, more graceful way to deal with this ?-RedWordSmith 04 : 05, 28 May 2006 ( UTC)
35.
The main difference between climate and everyday weather is best summarized by the popular phrase " Climate is what you expect, weather is what you get . " Over historic time spans there are a number of static variables that determine climate, including : latitude, altitude, proportion of land to water, and proximity to oceans and mountains.
36.
Another subtlety is " when " creation and destruction happen for static variables, whose lifespan coincides with the run time of the program do creation and destruction happen " during " regular program execution, or in special phases before and after regular execution and how objects are destroyed at program termination, when the program may not be in a usual or consistent state.
37.
Objects with static memory allocation, notably objects stored in static variables, and classes modules ( if classes or modules are themselves objects, and statically allocated ), have a subtle non-determinism in many languages : while their lifetime appears to coincide with the run time of the program, the " order " of creation and destruction-which static object is created first, which second, etc .-is generally nondeterministic.
38.
In other cases " lifetime " is irrelevant a label ( named position in the source code ) has lifetime identical with the program ( for statically compiled languages ), but may be in or out of context at a given point in the program, and likewise for static variables a static global variable is in context for the entire program, while a static local variable is only in context within a function or other local context, but both have lifetime of the entire run of the program.
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