CODEWITHSUNDEEP
javastaticfinal
Patrick Lorio
Patrick Lorio

Reputation: 5668

java static class / variables

Unsure about static variables.

import java.io.File;

public class Logger {
    public static final File log = new File(File.listRoots()[0], "log.log");
    public static void log (String message) {
        /* ... */
    }
}

Is the variable log pointing to the same memory throughout the life of the program? Basically is the log definition new File(File.listRoots()[0], "log.log") calculated multiple times or just one, and when?

Thanks in advance.

Upvotes: 5

Views: 1132

Answers (2)

mdakin
mdakin

Reputation: 1370

Just once. AFAIK, when class is loaded.

Upvotes: 0

Bozho
Bozho

Reputation: 597016

It is invoked once per classloader. Which, normally, means once.

A static variable is initialized as soon as the class declaring it is loaded by the classloader, and stays there until the classloader is destroyed, which in most cases means - at the end of the program execution / application lifecycle.

Upvotes: 11

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