Which of the following is a correct declaration of a variable and a call to a constructor of an ArrayList of double precision (double) numbers? Assume that the default constructor is defined. ArrayList numbers = new ArrayList; O ArrayList numbers = new ArrayList(); %3D ArrayList numbers new ArrayList(); ArrayList numbers = new ArrayList();

Which of the following is a correct declaration of a variable and a call to a constructor of an ArrayList of double precision (double) numbers? Assume that the default constructor is defined. ArrayList numbers = new ArrayList; O ArrayList numbers = new ArrayList(); %3D ArrayList numbers new ArrayList(); ArrayList numbers = new ArrayList();

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Concept explainers

Array

The simplest way to start thinking about an array is as a collection, or a set of elements. In programming, these elements may be constants, variables, functions and pointers.

Question

Which of the following is a correct declaration of a variable and a call to a
constructor of an ArrayList of double precision (double) numbers? Assume that the
default constructor is defined.
ArrayList<Double> numbers = new ArrayList<Double>;
O ArrayList<double> numbers = new ArrayList<double>();
%3D
ArrayList<Double> numbers
= new ArrayList<Double>();
ArrayList<Double> numbers = new ArrayList<Float>();
What is the UNIX command to copy the directory classes and its entire content that
is located in your home directory into classes_bkp, also in your home directory?
cp -r ~/classes ~/classes_bkp
copydir -/classes ~/classes_bkp
cp ~/classes ~/classes_bkp
cp -r HOME/classes HOME/classes_bkp

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