Does adding "synchronized" affect method overriding?

Question

my problem is that:

search_text.addModifyListener(new ModifyListener() {
        @Override
        public void modifyText(ModifyEvent e) {
            ArrayList<Object> GPDMvalue = (ArrayList<Object>) multiSortList.getValue();
            ArrayList<Map<String, Object>> valueList = getDefaultValue(GPDMvalue);
            multiSortList.clear();
            if(getGPDMList().size()==0)return;
            multiSortList.setDataSource(getGPDMList());//new thread 1
            multiSortList.setDefaultOrAddValue(valueList);//new thread 2
        }
    });

when the text changing too fast ,and the thread 1 or thread 2 does't excute completely,and the maybe some problem,so i want add the synchronized like this public synchronized void modifyText(ModifyEvent e), is this still a override method and will it work?

Answer 1

"Whether or not a method is synchronized is an implementation detail of the method. Synchronization isn't specified anywhere as a declarative contract - it's not like you can synchronize in interfaces, either.

How a class implements whatever thread safety guarantees it provides is up to it."

Taken from here

Answer 2

Adding the synchronized keyword does not get in the way of overriding a method (it is still overridden) because the method's signature remains the same.

For more details see JLS-§9.4.1.3

Answer 3

You can override a synchronized method and you can also remove synchronized keyword.

abstract class SynchronizedClass {
    public synchronized String myIterfaceMethod(String str){
        return str;
    }

}

public class OverrideSynchronozied extends SynchronizedClass{

    @Override
    public String myIterfaceMethod(String str){
        return str;
    }

    public static void main(String[] args) {
        SynchronizedClass ss = new OverrideSynchronozied();
        System.out.println(ss.myIterfaceMethod("Class Instance"));
    }

}