Foam Cover Gifts Women House Slippers Slippers Girls Animal Heel Novelty Memory Plush Unicorn q06nRTZPT
Plush Animal Foam Heel Girls Slippers Women Gifts Novelty Unicorn House Memory Slippers Cover
It's probably fair to say that on the whole, the volatile keyword in Java is poorly documented, poorly understood, and rarely used. To make matters worse, its formal definition actually changed as of Java 5. On this and the following pages, we will cut through this mess and look at what the Java volatile keyword does and when it is used. We will also compare it to other mechanisms available in Java which perform similar functions but under subtly different other circumstances.
What is the Java volatile keyword?
Essentially, volatile is used to indicate that a variable's value will be modified by different threads.
Declaring a volatile Java variable means:
The value of this variable will Women Plush Slippers Slippers Memory Heel Unicorn Cover Novelty Girls Gifts Animal House Foam never be cached thread-locally: all reads and writes will go straight to "main memory";
Access to the variable acts as though it is enclosed in a synchronized block, synchronized on itself.
We say "acts as though" in the second point, because to the programmer at least (and probably in most JVM implementations) there is no actual lock object involved. Here is how synchronized and Novelty Slippers Foam Gifts Heel Plush Slippers Women Cover Memory Unicorn Girls Animal House volatile compare:
Type of variable
Object or primitive
Foam Women Unicorn Heel Cover Plush Memory Slippers Slippers Gifts House Novelty Animal Girls No
In other words, the main differences between synchronized and volatile are:
a primitive variable may be declared volatile (whereas you can't synchronize on a primitive with synchronized);
an access to a volatile variable never has the potential to block: we're only ever doing a simple read or write, so unlike a synchronized block we will never hold on to any lock;
because accessing a volatile variable never holds a lock, it is not suitable for cases where we want to read-update-write as an atomic operation (unless we're prepared to "miss an update");
a volatile variable that is an object reference may be null (because you're effectively synchronizing on the reference, not the actual object).
Attempting to synchronize on a null object will throw a NullPointerException.
Volatile variables in Java 5
We mentioned that in Java 5, the meaning of volatile has been tightened up. We'll come back to this issue in a moment. First, we'll look at a typical example of using volatile. Later, we'll look at topics such as:
Magic Unicorn Slipper: Each adorable slipper is absolutely magical, and features a glittering golden horn and bright pink mane. It will bring lucky to you which making you blessed everyday keeping happy, You'll be so in love, you'll never want to take them off!
Comfort Soft - An ultra comfortable memory foam footbed surrounds your feet, keeping them supported and cushioned.ultra skin-friendly and comfy. Your feet will be surrounded by extremely cozy lining, like walking on a mushmallow.
Perfect for lounging - These soft sole house slippers feature a convenient slip on design, making them easy to put on when it's time to relax.
Warm keeping : Our home slipper crafted from soft fleece as upper material, breathable and skin friendly, lock the warm temperature and protect your health. Lining and sole padded with the plush and fleece, soft feeling make you relax
These slippers are a great choice for home, bedroom, living room, study, bathroom in cold weather ,Perfect as a gift for Thanksgiving Christmas New years Birthday Mother¡¯s Day, Valentine's Day for your family and friend to give them best wishes