What makes a java method code thread-safe?

Answer 1

The cleanest way to make a method thread-safe is add to the method declaration the synchronized keyword, like this:

public class MyClass{
// More code here

public synchronized void safeMethod(){
//Do something here, now is safe
}

}

The above code is the same as:

public class MyClass{
// More code here

public void safeMethod(){
synchronized (this){
//Do something here, now is safe
}
}

}