Can new an Interface or Abstract class?

Both interface and abstract class cannot not be instantiated, for they are pre-defined abstractions.
However in one situation, you may use 'new' followed by the interface type or abstraction class type.

When declaring an array, you may declare an interface type and abstract class type array.

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

/**
 *
 * @author YNZ
 */

interface myInterface{
    void doSth();
}

class myDevice extends myAbstract implements myInterface{

    @Override
    public void doSth() {
        System.out.println("my device do something!");
    }
}

abstract class myAbstract{
    abstract public void doSth();
}

public class InterfaceArray {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
       myInterface[] is = new myInterface[3];
       is[0] = new myDevice();
       is[1] = new myDevice();
       is[2] = new myDevice();
       
       List[] ls = new List[4];
       ls[1] = new ArrayList();
       ls[4] = new ArrayList();
       
       myAbstract[] as = new myAbstract[2];
       as[0] = new myDevice();
       as[1] = new myDevice();
    }
    
}