1006397
Descripción
Test por webmasterMyJavaZone, actualizado hace más de 1 año
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Creado por webmasterMyJavaZone
hace alrededor de 10 años
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Pregunta 1
Pregunta
Which statement is not true about package statements?
Respuesta
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Package statements are optional.
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Package statements are limited to one per source file.
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Standard Java coding convention for package names reverses the domain name of the organization or group creating the package.
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The package names beginning with javas.* and javaw.* are reserved.
Pregunta 2
Pregunta
Which statement represents a valid statement that will allow for the inclusion of classes from the java.util package?
Respuesta
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import java.util;
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import java.util.*;
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#include java.util;
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#include java.util.*;
Pregunta 3
Pregunta
List four interfaces of the Collections API.
Respuesta
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ArrayList, Map, Set, Queue
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List, Map, Set, Queue
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List, Map, HashSet, PriorityQueue
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List, HashMap, HashSet, PriorityQueue
Pregunta 4
Pregunta
Which class in the java.io package allows for the reading and writing of files to specified locations within a file?
Respuesta
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File
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FileDescriptor
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FilenameFilter
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RandomAccessFile
Pregunta 5
Pregunta
Which MS Windows–based command-line utility will allow you to run the Java interpreter without launching the console window?
Respuesta
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javaw
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interpw
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java -wo
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jconsole
Pregunta 6
Pregunta
What is the correct import package needed to use the ArrayList class?
Respuesta
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import java.awt.*;
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import java.io.*;
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import java.net.*;
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import javax.swing.*;
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import java.util.*;
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This is a trick question, because it is part of the java.lang package that is imported automatically.
Pregunta 7
Pregunta
Of the following packages, which contain classes for building a graphical interface? (Choose all that apply.)
Respuesta
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java.awt
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java.io
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java.net
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javax.swing
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java.util
Pregunta 8
Pregunta
Which of the following statements is correct?
Respuesta
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A Java class can extend only one superclass.
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A Java class can extend multiple superclasses.
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A Java class cannot extend any superclasses.
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A Java class does not extend superclasses; it implements them.
Pregunta 9
Pregunta
You have created a set of classes for your company and would like to include them in a package. Which one of the following would be a valid package name?
Respuesta
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your company name
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com.your company name
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java.your company name
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java.your_company_name
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com.your_company_name
Pregunta 10
Pregunta
What is the result of running the following command:
javac Simulator.java
Respuesta
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The simulator program would be executed.
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A bytecode file Simulator.class would be created.
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A bytecode file Simulator.java would be created.
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An error would be displayed because this is the wrong syntax.
Pregunta 11
Pregunta
Of the following, which types of statements must be used to count the number of nickels in a String array of various coins?
Respuesta
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Assignment
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Assertion
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Iteration
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Conditional
Pregunta 12
Pregunta
The following short code segment contains two errors. What are they?
int a = 1;
does
a = 2;
while (a == 1)
Respuesta
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The declaration for the variable a must occur within the dowhile statement.
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Braces must be included for do-while statements even when only one statement is enclosed.
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There is no does keyword; only the do keyword is allowed as part of a conditional statement.
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The do-while statement must end with a semicolon.
Pregunta 13
Pregunta
The continue and break statements are allowed within what types of statements?
Respuesta
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Loop statements
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All conditional statements
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The switch statement
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Expression statements
Pregunta 14
Pregunta
Select the commenting style that uses symbols designed to work with Javadoc.
Respuesta
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// @author Robert
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/* @author Robert */
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/** @author Robert */
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/** @author Robert ;
Pregunta 15
Pregunta
Given the following code segments, which answer is NOT a valid Javaimplementation because it won’t compile?
Respuesta
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int variableA = 10; float variableB = 10.5f; int variableC = variableA + variableB;
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int variableA = 10; float variableB = 10.5f; float variableC = variableA + variableB;
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byte variableA = 10; float variableB = 10.5f; float variableC = variableA + variableB;
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byte variableA = 10; double variableB = 10.5f; double variableC = variableA + variableB;
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