What is a tree in Java? A A tree is a branching mechanism that allows multiple decisions in one statement. B A tree is a collection in which each entry has one parent but may have multiple children. C A tree is a collection in which each entry may have multiple parents but may have only one child. D A tree is a method call pattern where each call may generate multiple additional calls until the process is complete. What arguments does Java need to create a Font object? A One argument: the font's name. B Two arguments: the font's name and its style. C Three arguments: the font's name, its style, and its size. D Four arguments: the font's name, its style, its size, and its color. How do we use an iterator to get the next element in a collection? A We call the iterator's next() method. B We call the collection's iterate() method. C We use the iterator's get() method. D We increase the iterator's index by one. Which of the following is an error condition that can occur when moving through a list using an iterator? A You could try to move past the end of the list. B You could get a file read or write error. C The iterator type may not match the collection type. D An empty class might create a null iterator. How many tabs does a tabbed pane have by default when you first create it? A None. All tabs have to be added by the program. B One. Java assumes you will need at least one tab. C Two. Java assumes you will need at least two tabs or you wouldn't be using a tabbed pane. D Three. That is the most common number used, so Java creates three tabs by default.

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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Question

What is a tree in Java?

A

A tree is a branching mechanism that allows multiple decisions in one statement.
B

A tree is a collection in which each entry has one parent but may have multiple children.
C

A tree is a collection in which each entry may have multiple parents but may have only one child.
D
A tree is a method call pattern where each call may generate multiple additional calls until the process is complete.
What arguments does Java need to create a Font object?

A

One argument: the font's name.

B

Two arguments: the font's name and its style.

C

Three arguments: the font's name, its style, and its size.

D

Four arguments: the font's name, its style, its size, and its color.

How do we use an iterator to get the next element in a collection?

A

We call the iterator's next() method.

B

We call the collection's iterate() method.

C

We use the iterator's get() method.

D

We increase the iterator's index by one.

Which of the following is an error condition that can occur when moving through a list using an iterator?

A

You could try to move past the end of the list.

B

You could get a file read or write error.

C

The iterator type may not match the collection type.

D

An empty class might create a null iterator.

How many tabs does a tabbed pane have by default when you first create it?

A

None. All tabs have to be added by the program.

B

One. Java assumes you will need at least one tab.

C

Two. Java assumes you will need at least two tabs or you wouldn't be using a tabbed pane.

D

Three. That is the most common number used, so Java creates three tabs by default.

What is the Collections class (not Collection)?

A

It is a class that includes several different types of collections.

B

It is an interface defining the methods that any collection must implement.

C

It provides a number of common methods that work with different collections.

D

It is an abstract class providing some of the methods that all collections use, and defining others that must be implemented in any collection.

How is a map different from other Java data structures?

A

Each data element connects to the next element in the map.

B

It's a data structure that stores data pairs: keys and their associated values.

C

Each data element can connect to multiple related elements in a map.

D

It's a data structure that keeps its data sorted.

What is a wrapper class?

A

A class that wraps a border around an image in a window.

B

A class that encloses related classes into a package.

C

A class that puts the finishing touches on a GUI project by adding a "theme" of related colors and style elements.

D

A class that wraps a primitive data type in an object so it can be stored in a collection.

How does a map tell us when an element is not found?

A

The map returns a null reference.

B

The map throws an exception.

C

The map returns an empty data object.

D

The map returns a value of zero.

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