constrained type parameters

[oll3i]

cd u give me the example of constrained type parameters

[oll3i]

is it something like

import java.util.List;
import java.util.ArrayList;

public class Library<E extends Media> {
    private List<E> resources = new ArrayList<E>();
    public void addMedia(E x) {
        resources.add(x);
    }
    public E retrieveLast() {
        int size = resources.size();
        if (size > 0) {
            return resources.get(size - 1);
        }
        return null;
    }
}

[oll3i]

or sth like this

int myProperty;
    public int getMyProperty() {
        return myProperty;
    }
    public void setMyProperty(int newValue) throws PropertyVetoException {
        try {
            vceListeners.fireVetoableChange(
                "myProperty", new Integer(myProperty), new Integer(newValue));
            myProperty = newValue;
        } catch (PropertyVetoException e) {
            throw e;
        }
    }
    
    // Create the listener list.
    VetoableChangeSupport vceListeners = new VetoableChangeSupport(this);
    
    // The listener list wrapper methods.
    public synchronized void addVetoableChangeListener(VetoableChangeListener listener) {
        vceListeners.addVetoableChangeListener(listener);
    }
    public synchronized void removeVetoableChangeListener(VetoableChangeListener listener) {
        vceListeners.removeVetoableChangeListener(listener);
    }

[oll3i]

how to do it with ArrayList<Strin g>

[r035198x]

cd u give me the example of constrained type parameters

If you want to restrict a collection to store object of type E only then you declare as

 ArrayList<E> list = new ArrayList<E>();