How can I override addAll method in LineChart ?

Question

Hi,
I need to add some statement when the methods add or addAll are invoked in linechart. How can I do ?
I thought to do an override of the method, like this
public boolean addAll(Collection<? extends E> es) {   
        return super.addAll(es);
        <  ..some new statement... >
but something is wrong.

Answer 1

'return' returns immediately from your method, so the remaining statements can't be reached. Do
public boolean addAll(Collection<? extends E> es) {  
        //<  ..some new statement... >
        return super.addAll(es);
or
public boolean addAll(Collection<? extends E> es) {  
        boolean result =  super.addAll(es);
        // <  ..some new statement... >
        return result ;