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Where does the Java virtual machine keep space for local method variables?
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When variables are declared in the body of a method they are know as what?
Local Variables There are two types of variables based on the location of declaration 1. Instance Variables- Declared inside a class, but outside of any method's body. 2. Local Variables- Declared inside a method's body inside a class.
What is Variable Shadowing in Java?
In Java, there are three kinds of variables: local variables, instance variables, and class variables. Variables have their scopes. Different kinds of variables have different scopes. A variable is shadowed if there is another variable with the same name that is closer in scope. In other words, referring to the variable by name will use the one closest in scope, the one in the outer scope is shadowed.A Local Variable Shadows An Instance VariableInside a class method, when a local variable have the same name as one of the instance variable, the local variable shadows the instance variable inside the method block.
What is the default initial value for all numeric types?
If they are instance variables the default initial value is 0. If they are method local variables, they are null and must be initialized to some value before they are used
Should you avoid local variable scope?
No. In most designs, local variables are considered a good thing thanks to the isolation that they provide (no other code can "abuse" your variable). However, it is important to distinguish between local static variables, local automatic variables, and locally made references to the heap. Local static variables are initialized only once at application initialization time, and retain their most recently assigned value over multiple invocations of the function which contains them. Local static variables must be used with care and can lead to non-reentrant code (the famous example being the strtok() CRT function). However, these variables are usually great to track the total number of something, or the minimum or maximum value of a particular item, etc. In C, local automatic variables are the most common form of local variables. These are typically allocated on the stack, so care must be taken when declaring large automatic variables, or when using recursion. When the size of a local automatic variable is a concern, dynamic memory management method should be considered those maintain a local auto pointer on the stack but place the data in the heap. This method allows to allocate large amounts of data without burden on the stack, and the lifetime of such data is no longer limited by the lifetime of the scope in which it was allocated. Very rare cases exist where local variables are generally avoided; these are mostly in the area of very resource limited embedded programming.
Can a static method access instance variables?
Variables cannot access variables; only methods can access variables. Non-static methods (also known as instance methods) are local to an object of the class and therefore have access to a "this" reference (referring to the current instance of the class, the object upon which the method was invoked), but static variables are local to the class itself. These variables are shared by all objects of the class and are therefore accessible to non-static methods. Static variable are also accessible to static methods and are therefore accessible even when no objects of the class exist.
When variables are declared in the body of a method they are know as what?
Local Variables There are two types of variables based on the location of declaration 1. Instance Variables- Declared inside a class, but outside of any method's body. 2. Local Variables- Declared inside a method's body inside a class.
Can variable declared in one scriplet access in another scriplet?
No. Variables declared inside a scriptlet are like method local variables which are not accessible outside the scriptlet/method.
What is Variable Shadowing in Java?
In Java, there are three kinds of variables: local variables, instance variables, and class variables. Variables have their scopes. Different kinds of variables have different scopes. A variable is shadowed if there is another variable with the same name that is closer in scope. In other words, referring to the variable by name will use the one closest in scope, the one in the outer scope is shadowed.A Local Variable Shadows An Instance VariableInside a class method, when a local variable have the same name as one of the instance variable, the local variable shadows the instance variable inside the method block.
Is it possible to write in static variables in main method in java?
Short answer: No. Only class member variables may be declared static. Local variables with a static declaration will throw an error (usually "illegal start of expression").
What is the default initial value for all numeric types?
If they are instance variables the default initial value is 0. If they are method local variables, they are null and must be initialized to some value before they are used
In what directory is the XP virtual machine installed in?
You can find it in c:\Users\Root\AppData\Local\Microsoft\Windows Virtual PC\. If you want to see the directory you need to enable "Show system (hidden) files and folders".
Why can't java compiler initialize local variables?
Its not that the compiler can't initialize local variables; its that the compiler does not initialize local variables.This is by design and language specification. If you want to initialize local variables, you must explicitly do so.
What is meant by a class in java programming?
Class - A class can be defined as a template/ blue print that describe the behaviors/states that object of its type support.Classes in Java:A class is a blue print from which individual objects are created.A sample of a class is given below: public class Dog{ String breed; int age; String color; void barking(){ } void hungry(){ } void sleeping(){ } }A class can contain any of the following variable types.Local variables . variables defined inside methods, constructors or blocks are called local variables. The variable will be declared and initialized within the method and the variable will be destroyed when the method has completed.Instance variables . Instance variables are variables within a class but outside any method. These variables are instantiated when the class is loaded. Instance variables can be accessed from inside any method, constructor or blocks of that particular class.Class variables . Class variables are variables declared with in a class, outside any method, with the static keyword.A class can have any number of methods to access the value of various kind of methods. In the above example, barking(), hungry() and sleeping() are variables.
Should you avoid local variable scope?
No. In most designs, local variables are considered a good thing thanks to the isolation that they provide (no other code can "abuse" your variable). However, it is important to distinguish between local static variables, local automatic variables, and locally made references to the heap. Local static variables are initialized only once at application initialization time, and retain their most recently assigned value over multiple invocations of the function which contains them. Local static variables must be used with care and can lead to non-reentrant code (the famous example being the strtok() CRT function). However, these variables are usually great to track the total number of something, or the minimum or maximum value of a particular item, etc. In C, local automatic variables are the most common form of local variables. These are typically allocated on the stack, so care must be taken when declaring large automatic variables, or when using recursion. When the size of a local automatic variable is a concern, dynamic memory management method should be considered those maintain a local auto pointer on the stack but place the data in the heap. This method allows to allocate large amounts of data without burden on the stack, and the lifetime of such data is no longer limited by the lifetime of the scope in which it was allocated. Very rare cases exist where local variables are generally avoided; these are mostly in the area of very resource limited embedded programming.
Can a static method access instance variables?
Variables cannot access variables; only methods can access variables. Non-static methods (also known as instance methods) are local to an object of the class and therefore have access to a "this" reference (referring to the current instance of the class, the object upon which the method was invoked), but static variables are local to the class itself. These variables are shared by all objects of the class and are therefore accessible to non-static methods. Static variable are also accessible to static methods and are therefore accessible even when no objects of the class exist.
What are the differences between global variables and local variables in C plus plus?
Global variables can be seen in all blocks of your program, when local variables are visible only within the block where it's declared.
Where auto variables are stored?
Auto variables are stored on the stack alongside all other local variables.
