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In Java, is a global variable always put on the heap?


In Java, is a global variable always put on the heap?

By : John Crank
Date : November 22 2020, 11:17 AM
around this issue Java has a concept of PermGen space - this is the space used to store all class definitions, static variables, interned strings, etc. here is link
code :


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C - Assigning heap memory to Global variable

C - Assigning heap memory to Global variable


By : Anil Kushwaha
Date : March 29 2020, 07:55 AM
help you fix your problem On Linux, the library global variable sits in some data segment of the shared object, and that segment would have been munmap-ed when dlclose-ing the libtemp.so and would have been mmap-ed again at the next dlopen so the global would have been reinitialized.
(I am assuming you are doing only one single dlopen i.e. that the libtemp.so is not dlopen-ed twice)
How can I increase the global heap size for java on Mac OSX

How can I increase the global heap size for java on Mac OSX


By : Daniel H
Date : March 29 2020, 07:55 AM
hop of those help? From this article on the missing Java Preferences after the recent update it looks like you can download Java 1.7 and will then have access to Oracle's Java Preferences under System Preferences.
Note that your apps may or may not run under Java 1.7 - upgrading can always be risky.
Why Global variable does not update with global function within the same Global variable? Android/Java

Why Global variable does not update with global function within the same Global variable? Android/Java


By : 黄雨生
Date : March 29 2020, 07:55 AM
it helps some times In your code, the constant GET_CART_ALL_ITEM is created and initialize only one time, and it takes the current value of ReturnUserRrQuote(). Later It will not trigger the function as the constant already has its value and does not require a new initialization.
If at the beginning of code ReturnUserRrQuote() => "100". Then GET_CART_ALL_ITEM is created and initialize with this value, it will be "store/3/cart/100/type/customer" and not "store/3/cart/" + ReturnUserRrQuote() + "/type/customer". It's due cause at initialization the expression "store/3/cart/" + ReturnUserRrQuote() + "/type/customer" is evaluated and the result is affected to the constant (the expression is not affected to the constant).
code :
public static final const1 = "store/3/cart/";
public static final const2 = "/type/customer";

//whenever you have to obtain your value
String value = const1 + ReturnUserRrQuote() + const2;
//Static function that return the number of times it has been called
public static returnNumber() {
    final int i=1;
    return i++;
 }

public static void main() {
    int a = returnNumber(); //Initialize a
    for (j=0; j<10; j++) {
        System.out.println(a); //print the current value of a
    }
}
Where does class, object, reference variable get stored in Java. In heap or in stack? Where is heap or stack located?

Where does class, object, reference variable get stored in Java. In heap or in stack? Where is heap or stack located?


By : Shahroz Ahmed
Date : March 29 2020, 07:55 AM
seems to work fine I understand that variables of a method are stored in stack and class variables are stored in heap. Then where does the classes and objects we create get stored in Java? , Runtime data area in JVM can be divided as below,
How to declare a global 2d 3d 4d ... array (heap version) variable that could be used in the entire program?

How to declare a global 2d 3d 4d ... array (heap version) variable that could be used in the entire program?


By : Zamarrud
Date : March 29 2020, 07:55 AM
wish of those help Instead of manually allocating an array you should at least use a std::vector. What you would do is have a header file that contains
code :
extern std::vector<std::vector<std::vector<int>>> data;
std::vector<std::vector<std::vector<int>>> data = std::vector<std::vector<std::vector<int>(a, std::vector<std::vector<int>>(b, std::vector<int>(c)));
class matrix
{
    std::vector<int> data;
    int row; // this really isn't needed as data.size() will give you rows
    int col;
    int depth;
public:
    matrix(int x, int y, int z) : data(x * y * z), row(x), col(y), depth(z) {}
    int& operator()(int x, int y, int z) { return data[x + (y * col) + (z * col * depth)]; }
};
extern matrix data;
matrix data(a, b, c);
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