Chapter 1 Review Questions

Question 1

1.Which of the following are true statements? (Choose all that apply.)

A. Java allows operator overloading.
B. Java code compiled on Windows can run on Linux.
C. Java has pointers to specific locations in memory.
D. Java is a procedural language.
E. Java is an object-oriented language.
F. Java is a functional programming language.

Answer 1

B, E.
C++ has operator overloading and pointers. Java made a point of not having either. Java does have references to objects, but these are pointing to an object that can move around in memory. Option B is correct because Java is platform independent. Option E is correct because Java is object-oriented. While it does support some parts of functional programming, these occur within a class.

Question 2

2.Which of the following are true? (Choose all that apply.)

A. javac compiles a .class file into a .java file.
B. javac compiles a .java file into a .bytecode file.
C. javac compiles a .java file into a .class file.
D. java accepts the name of the class as a parameter.
E. java accepts the filename of the .bytecode file as a parameter.
F. java accepts the filename of the .class file as a parameter.

Answer 2

C, D.
Java puts source code in .java files and bytecode in .class files. It does not use a .bytecode file. When running a Java program, you pass just the name of the class without the .class extension.

Question 3

3.Which of the following are true if this command completes successfully assuming the CLASSPATH is not set? (Choose all that apply.)

java MyProgram.java

A .class file is created.
B. MyProgram can reference classes in the package com.sybex.book.
C. MyProgram can reference classes in the package java.lang.
D. MyProgram can reference classes in the package java.util.
E. None of the above. The program needs to be run as java MyProgram.

Answer 3

C, D.
This example is using the single-file source-code launcher. It compiles in memory rather than creating a .class file, making option A incorrect. To use this launcher, programs can only reference classes built into the JDK. Therefore, option B is incorrect, and options C and D are correct.

Question 4

4.Given the following classes, which of the following can independently replace INSERT IMPORTS HERE to make the code compile? (Choose all that apply.)

package aquarium;
public class Tank { }
package aquarium.jellies;
public class Jelly { }
package visitor;
INSERT IMPORTS HERE
public class AquariumVisitor {
  public void admire(Jelly jelly) { } }

A. import aquarium.;
B. import aquarium..Jelly;
C. import aquarium.jellies.Jelly;
D. import aquarium.jellies.;
E. import aquarium.jellies.Jelly.;
F. None of these can make the code compile.

Answer 4

C, D

Question 5

5.Which are included in the JDK? (Choose all that apply.)

A.javac
B.Eclipse
C.JVM
D.javadoc
E.jar
F.None of the above

Answer 5

A, C, D, E

Question 6

6.Given the following classes, what is the maximum number of imports that can be removed and have the code still compile?

package aquarium;
public class Water { }
package aquarium;
import java.lang.*;
import java.lang.System;
import aquarium.Water;
import aquarium.*;
public class Tank {
  public void print(Water water) {
     System.out.println(water); } }

A. 0
B. 1
C. 2
D. 3
E. 4
F. Does not compile

Answer 6

E

Question 7

7.Given the following classes, which of the following snippets can independently be inserted in place of INSERT IMPORTS HERE and have the code compile? (Choose all that apply.)

package aquarium;
public class Water {
   boolean salty = false;
}
 
package aquarium.jellies;
public class Water {
   boolean salty = true;
}
 
package employee;
INSERT IMPORTS HERE
public class WaterFiller {
   Water water;
}

A. import aquarium.;
B. import aquarium.Water;
import aquarium.jellies.;
C. import aquarium.;
import aquarium.jellies.Water;
D. import aquarium.;
import aquarium.jellies.*;
E. import aquarium.Water;
import aquarium.jellies.Water;
F.None of these imports can make the code compile.

Answer 7

A, B, C

Question 8

8.Given the following command, which of the following classes would be included for compilation? (Choose all that apply.)

javac *.java

A. Hyena.java
B. Warthog.java
C. land/Hyena.java
D. land/Warthog.java
E. Hyena.groovy
F. Warthog.groovy

Answer 8

A, B

Question 9

9.Given the following class, which of the following calls print out Blue Jay? (Choose all that apply.)

public class BirdDisplay {
   public static void main(String[] name) {
      System.out.println(name[1]);
} }

A. java BirdDisplay Sparrow Blue Jay
B. java BirdDisplay Sparrow “Blue Jay”
C. java BirdDisplay Blue Jay Sparrow
D. java BirdDisplay “Blue Jay” Sparrow
E. java BirdDisplay.class Sparrow “Blue Jay”
F. java BirdDisplay.class “Blue Jay” Sparrow

Answer 9

B

Question 10

10.Which of the following are legal entry point methods that can be run from the command line? (Choose all that apply.)

A. private static void main(String[] args)
B. public static final main(String[] args)
C. public void main(String[] args)
D. public static void test(String[] args)
E. public static void main(String[] args)
F. public static main(String[] args)

Answer 10

E

Question 11

11.Which of the following are true statements about Java? (Choose all that apply.)

A. Bug-free code is guaranteed.
B. Deprecated features are never removed.
C. Multithreaded code is allowed.
D. Security is a design goal.
E. Sideways compatibility is a design goal.

Answer 11

C, D

Question 12

12.Which options are valid on the javac command without considering module options? (Choose all that apply.)

A. -c
B. -C
C. -cp
D. -CP
E. -d
F. -f
G. -p

Answer 12

C, E

Question 13

13.Which options are valid on the java command without considering module options? (Choose all that apply.)

A. -c
B. -C
C. -cp
D. -d
E. -f
F. -p

Answer 13

C

Question 14

14.Which options are valid on the jar command without considering module options? (Choose all that apply.)

A. -c
B. -C
C. -cp
D. -d
E. -f
F. -p

Answer 14

A, B, C, E

Question 15

15.What does the following code output when run as java Duck Duck Goose?

public class Duck {
   public void main(String[] args) {
      for (int i = 1; i <= args.length; i++)
         System.out.println(args[i]);
} }

A. Duck Goose
B. Duck ArrayIndexOutOfBoundsException
C. Goose
D. Goose ArrayIndexOutOfBoundsException
E. None of the above

Answer 15

D

Question 16

16.Suppose we have the following class in the file /my/directory/named/A/Bird.java. Which of the answer options replaces INSERT CODE HERE when added independently if we compile from /my/directory? (Choose all that apply.)

INSERT CODE HERE
public class Bird { }

A. package my.directory.named.a;
B. package my.directory.named.A;
C. package named.a;
D. package named.A;
E. package a;
F. package A;

Answer 16

D

Question 17

17.Which of the following are true? (Choose all that apply.)

public class Bunny {
   public static void main(String[] x) {
      Bunny bun = new Bunny();
} }

A. Bunny is a class.
B. bun is a class.
C. main is a class.
D. Bunny is a reference to an object.
E. bun is a reference to an object.
F. main is a reference to an object.
G. The main() method doesn’t run because the parameter name is incorrect.

Answer 17

A, E

Question 18

18.Which answer options represent the order in which the following statements can be assembled into a program that will compile successfully? (Choose all that apply.)

X: class Rabbit {}
Y: import java.util.*;
Z: package animals;

A. X, Y, Z
B. Y, Z, X
C. Z, Y, X
D. Y, X
E. Z, X
F. X, Z

Answer 18

C, D, E

Question 19

19.Which are not available for download from Oracle for Java 11? (Choose all that apply.)

A. JDK
B. JRE
C. Eclipse
D. All of these are available from Oracle.

Answer 19

B, C

Question 20

20.Which are valid ways to specify the classpath when compiling? (Choose all that apply.)

A. -cp
B. -classpath
C. –classpath
D. -class-path
E. –class-path

Answer 20

A, B, E