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What does the modifier volatile in Java do?
The volatile modifier is used to let the JVM understand that a thread accessing the variable should always merge its own personal copy of the variable with the original in the memory.
Accessing a volatile variable synchronizes all the cached copy of the variables in the main memory. Volatile can only be applied to instance variables, which are of type object or private. A volatile object reference can be null.
Example
public class MyRunnable implements Runnable {
private volatile boolean active;
public void run() {
active = true;
while (active) {
}
}
public void stop() {
active = false;
}
}
Updated on: 19-Feb-2020
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