Simulador de preparacion exmen certificacion JAVA 7 developer

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Question 1 of 53

what are the valid components of a java source file (choose all that apply)

Select one or more of the following:

package statement
import statements
methods
variables
java compiler
java runtime environment

Explanation

Question 2 of 53

the following munbered list of java class components is not in any particular order. select the correct order of their occurrence in a java class (choose all that apply):

1. comments
2. import statements
3. package statement
4. methods
5. class declaration
6. variables.

Select one or more of the following:

1,3,2,5,6,4
3,1,2,5,4,6
3,2,1,4,5,6
3,2,1,5,6,4

Explanation

Question 3 of 53

which of the following examples define the correct java class structure

Select one or more of the following:

Explanation

Question 4 of 53

given the following definition of the class EjavaGuru,

what is the output of the previous class, if it is executed using the command:

"java EjavaGuru one two three four"

Select one or more of the following:

one:two:three
EJavaGuru:one:tow
java:EJavaGuru:one
tow:three:four

Explanation

Question 5 of 53

given the following contents of the java source code file MyClass.java select the correct options

Select one or more of the following:

the imported class, java.util.Date, can be accessed only in the class Student.
the imported class, java.util.Date, can be accessed by both the Student and Course classes
Both of the classes Student and Course are defined in the package com.ejavaguru.
Course is defined in the default java package.

Explanation

Question 6 of 53

which of the following options, when inserted at //INSERT CODE HERE will print out EJavaGuru

Select one or more of the following:

public void main (String [] args)
public void main (String args [] )
static public void main (String[] array)
public static void main (String args)
static public main (String args[])

Explanation

Question 7 of 53

select the correct options

Select one or more of the following:

you can start the execution of a java application through the main method
the java compiler calls and executes the main method
the java virtual machine calls and executes the main method
a class calls and executes the main method

Explanation

Question 8 of 53

A class Course is definided in a package com.ejavaguru. Given that the physical location of the corresponding class file is /mycode/com/ejavaguru/Course.class and execution takes place within the mycode directory, which of the following lines of code, when inserted //INSERT CODE HERE, will import the Course class into the class MyCourse

Select one or more of the following:

import mycode.com.ejavaguru.Course;
import com.ejavaguru.Course;
import mycode.com.ejavaguru;
import com.ejavaguru;
import mycode.com.ejavaguru.*;
import com.ejavaguru.*;

Explanation

Question 9 of 53

examine the following code:

which of the following statements will be true if the variable courseName is defined as a private variable?

Select one or more of the following:

class EJavaGuru will print Java
class EJavaGuru will print null
class EJavaGuru will won't compile
class EJavaGuru will throw an exception at runtime

Explanation

Question 10 of 53

Given the following definition of the class Course:

what's the output of the following code?

Select one or more of the following:

the class EJavaGuru will print java
the class EJavaGuru will print null
the class EJavaGuru will not compile
the class EJavaGuru will throw an exception at runtime

Explanation

Question 11 of 53

Given the following code, select the correct options

Select one or more of the following:

you can't define a method argument as a private variable
a method argument should be defined with either public or default accessibility
for overridden methods, method arguments should be defined with protected accessibility.
none of the above

Explanation

Question 12 of 53

Select all incorrect statements

Select one or more of the following:

a programmer can't define a new primitive data type
a programmer can define a new primitive data type
once assigned, the value of a primitive can't be modified
a value can't be assigned to a primitive variable

Explanation

Question 13 of 53

which of the options are correct for the following code?

Select one or more of the following:

code at line 4 fails to compile
code at line 5 fails to compile
code at line 6 fails to compile
code at line 7 fails to compile

Explanation

Question 14 of 53

what is the output of the following code?

Select one or more of the following:

Explanation

Question 15 of 53

Select the options that is / are the best choice for de following

Select one or more of the following:

long, boolean, double
long, int, float
char, int, double
long, boolean, float

Explanation

Question 16 of 53

which of the following options contain correct code to declare and initialize variables to store numbers?

Select one or more of the following:

bit a = 0;
integer a2 = 7;
long a3 =0X10C;
short a4 = 0512;
double a5 = 10;
byte a7 = -0;
long a8 = 123456789;

Explanation

Question 17 of 53

Select the options that, when inserted at //INSERTE CODE HERE, will make the following code output code a value of 11

Select one or more of the following:

ctr +=1;
ctr =+1;
++ctr;
ctr = 1;

Explanation

Question 18 of 53

what is the output of the following code

Select one or more of the following:

218
232
246
compilation error

Explanation

Question 19 of 53

what is true about the following lines of code

Select one or more of the following:

code prints true
code prints false
code prints >= false
compilation error

Explanation

Question 20 of 53

which of the following methods correctly accepts three whole numbers as methods arguments and returns their sum as a decimal number?

Select one or more of the following:

Explanation

Question 21 of 53

how can you include encapsulation in your class design

Select one or more of the following:

define instance variables as private members
define public methods to access and modify the instance variables
define some of the instance variables as public members
all of the previous

Explanation

Question 22 of 53

if the functionality of the operators = and > were to be swapped in java (for the code on line number 4, 5, and 6), what would be the result of the following code?

Select one or more of the following:

true, true, false
10.0, false, false
false, false, false
compilation error

Explanation

Question 23 of 53

examine the following code and select the correct options

Select one or more of the following:

code prints false
code prints true
a code will print true if code on line 6 is modified to the following
code will print true if code on line 6 is modified to the following

Explanation

Question 24 of 53

examine the following code and select the correct options

Select one or more of the following:

the heigth de a Person can never be set to more than 300.
the previous code is an example of a well-encapsulated class
the class would be better encapsulated if the heigth validation weren't set to 300.
even though the class isn't well encapsulated, it can be inherited by other classes

Explanation

Question 25 of 53

which of the following correctly accepts three whole numbers as method arguments and returns their sum as a decimal number?

Select one or more of the following:

Explanation

Question 26 of 53

which of the following statements are true?

Select one or more of the following:

if the return type of a method is int, the method can return a value od type byte
a method may or may not return a value
if the return type of a method is void, it can define a return statement without a value, as follows: "return;"
a method may or may not accept any method arguments.
a method should accept at least one method argument or define its return type.
a method whose return type is String can't return null

Explanation

Question 27 of 53

Given the following definition of class Person,

Select one or more of the following:

anotherMethod, anotherMethod, someMethod, someMethod
anotherMethod, EJava, someMethod, someMethod
anotherMethod, EJava, someMethod, EJava
Compilation error.

Explanation

Question 28 of 53

what is the ouput of the following code?

Select one or more of the following:

20
10
11
11
20
20
11
10
20
10
11
10
compilation error

Explanation

Question 29 of 53

Given the following signature of method eJava, choose the options that correctly overload this method

Select one or more of the following:

private String eJava(int val, String firstName, double dur)
public void eJava(int val1, String val2, double val3)
String eJava(int name , String age, double duration)
float eJava(double name, String age, byte duration)
ArrayList<String> eJava()
char[] eJava(double numbers)
String eJava()

Explanation

Question 30 of 53

given the following code,

Select one or more of the following:

Compilation error
Rintime exception
int
String
long
Object

Explanation

Question 31 of 53

examine the following code and select the correct options:

Select one or more of the following:

The class EJava defines three overloaded contructors
The class Ejava define two overloaded contructors. The private constructor isn't counted as an overloaded constructor.
Constructors with different access modifiers can't call each other
the code prints the following:

protected
private
public
the code prints the following:

public
private
protected

Explanation

Question 32 of 53

Select the incorrect options

Select one or more of the following:

If a user defines a private constructor for a public class, Java creates a public default constructor for the class.
A class that gets a default constructor doesn’t have overloaded constructors.
A user can overload the default constructor of a class.
The following class is eligible for default constructor:

class EJava {}
The following class is also eligible for a default constructor:

class EJava {
void EJava() {}
}

Explanation

Question 33 of 53

What is the output of the following code?

Select one or more of the following:

4c010
4c10
113
103
Compilation error

Explanation

Question 34 of 53

What is the output of the following code?

Select one or more of the following:

0:0
a:b
0:b
a:0
compilation error

Explanation

Question 35 of 53

Which of the following are valid lines of code to define a multidimensional
int array?

Select one or more of the following:

int[][] array1 = {{1, 2, 3}, {}, {1, 2,3, 4, 5}};
int[][] array2 = new array() {{1, 2, 3}, {}, {1, 2,3, 4, 5}};
int[][] array3 = {1, 2, 3}, {0}, {1, 2,3, 4, 5};
int[][] array5 = new int[2][];

Explanation

Question 36 of 53

Which of the following statements are correct?

Select one or more of the following:

By default, an ArrayList creates an array with an initial size of 16 to store its elements.
Because ArrayList stores only objects, you can’t pass element of an ArrayList to a switch construct.
Calling clear() or remove() on an ArrayList, will remove all its elements.
If you frequently add elements to an ArrayList, specifying a larger capacity will improve the code efficiency.
Calling the method clone() on an ArrayList creates its shallow copy; that is, it doesn’t clone the individual list elements.

Explanation

Question 37 of 53

Which of the following statements are correct?

Select one or more of the following:

An ArrayList offers a resizable array, which is easily managed using the methods it provides. You can add and remove elements from an ArrayList.
Values stored by an ArrayList can be modified.
You can iterate through elements of an ArrayList using a for loop, Iterator, or ListIterator.
An ArrayList requires you to specify the total elements before you can store any elements in it.
An ArrayList can store any type of object.

Explanation

Question 38 of 53

What is the output of the following code?

Select one or more of the following:

Line 7 prints true
Line 7 prints false
Line 8 prints -1
Line 8 prints 1
Line 9 removes all elements of the list ejg
Line 9 sets ejg to null
Line 10 prints null
Line 10 prints []
Line 10 prints a value similar to ArrayList@16356
Line 11 throws an exception

Explanation

Question 39 of 53

What is the output of the following code?

Select one or more of the following:

true printed once
false printed once
true printed in an infinite loop
false printed in an infinite loop

Explanation

Question 40 of 53

What is the output of the following code?

Select one or more of the following:

gZmeAZ
gZmeAa
gZm
gZ
game

Explanation

Question 41 of 53

What is the output of the following code?

Select one or more of the following:

gZmeAZ
gZmeAa
gZm
gZ
game

Explanation

Question 42 of 53

What is the output of the following code?

Select one or more of the following:

12S512S5
12S12S
1025102S
dRuntime exception

Explanation

Question 43 of 53

What is the output of the following code?

Select one or more of the following:

521
Runtime exception
65321
65431

Explanation

Question 44 of 53

What’s the output of the following code?

Select one or more of the following:

Explanation

Question 45 of 53

What’s the output of the following code?

Select one or more of the following:

Explanation

Question 46 of 53

Which of the following statements is true?

Select one or more of the following:

The enhanced for loop can’t be used within a regular for loop.
The enhanced for loop can’t be used within a while loop.
The enhanced for loop can be used within a do-while loop.
The enhanced for loop can’t be used within a switch construct.
All of the above statements are false.

Explanation

Question 47 of 53

What’s the output of the following code?

Select one or more of the following:

true
false
ABC
false
ABC
true
ABC
Compilation error

Explanation

Question 48 of 53

Given the following code, which of the following lines of code can individually replace the //INSERT CODE HERE line so that the code compiles successfully?

Select one or more of the following:

case 10*3: System.out.println(2);
case num: System.out.println(3);
case 10/3: System.out.println(4);
case num2: System.out.println(5);

Explanation

Question 49 of 53

What’s the output of the following code?

Select one or more of the following:

default
default
4
4
Compilation error

Explanation

Question 50 of 53

What’s the output of the following code?

Select one or more of the following:

default
case1
case2
case1
case2
case2
Compilation error
Runtime exception

Explanation

Question 51 of 53

What’s the output of the following code?

Select one or more of the following:

ejava
enum
guru
ejava
ejavaguru
e
ejava
enum
guru
ejavaguru

Explanation

Question 52 of 53

What’s the output of the following code?

Select one or more of the following:

else
0
1
2
0
1
Compilation error

Explanation

Question 53 of 53

What’s the output of the following code?

Select one or more of the following:

Compilation error
0
5
0
5
10
10
0
1
5
5

Explanation

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	Created by JUAN JOSÈ ORJUEL about 9 years ago

se trata de hacer un examen para prepararse para el examen de certificacion de java

Simulador de preparacion exmen certificacion JAVA 7 developer

Question 1 of 53

what are the valid components of a java source file (choose all that apply)

Select one or more of the following:

Explanation

Question 2 of 53

the following munbered list of java class components is not in any particular order. select the correct order of their occurrence in a java class (choose all that apply): 1. comments 2. import statements 3. package statement 4. methods 5. class declaration 6. variables.

Select one or more of the following:

Explanation

Question 3 of 53

which of the following examples define the correct java class structure

Select one or more of the following:

Explanation

Question 4 of 53

given the following definition of the class EjavaGuru, what is the output of the previous class, if it is executed using the command: "java EjavaGuru one two three four"

Select one or more of the following:

Explanation

Question 5 of 53

given the following contents of the java source code file MyClass.java select the correct options

Select one or more of the following:

Explanation

Question 6 of 53

which of the following options, when inserted at //INSERT CODE HERE will print out EJavaGuru

Select one or more of the following:

Explanation

Question 7 of 53

select the correct options

Select one or more of the following:

Explanation

Question 8 of 53

Select one or more of the following:

Explanation

Question 9 of 53

examine the following code: which of the following statements will be true if the variable courseName is defined as a private variable?

Select one or more of the following:

Explanation

Question 10 of 53

Given the following definition of the class Course: what's the output of the following code?

Select one or more of the following:

Explanation

Question 11 of 53

Given the following code, select the correct options

Select one or more of the following:

Explanation

Question 12 of 53

Select all incorrect statements

Select one or more of the following:

Explanation

Question 13 of 53

which of the options are correct for the following code?

Select one or more of the following:

Explanation

Question 14 of 53

what is the output of the following code?

Select one or more of the following:

Explanation

Question 15 of 53

Select the options that is / are the best choice for de following

Select one or more of the following:

Explanation

Question 16 of 53

which of the following options contain correct code to declare and initialize variables to store numbers?

Select one or more of the following:

Explanation

Question 17 of 53

Select the options that, when inserted at //INSERTE CODE HERE, will make the following code output code a value of 11

Select one or more of the following:

Explanation

Question 18 of 53

what is the output of the following code

Select one or more of the following:

Explanation

Question 19 of 53

what is true about the following lines of code

Select one or more of the following:

Explanation

Question 20 of 53

which of the following methods correctly accepts three whole numbers as methods arguments and returns their sum as a decimal number?

Select one or more of the following:

the following munbered list of java class components is not in any particular order. select the correct order of their occurrence in a java class (choose all that apply):

1. comments
2. import statements
3. package statement
4. methods
5. class declaration
6. variables.

given the following definition of the class EjavaGuru,

what is the output of the previous class, if it is executed using the command:

"java EjavaGuru one two three four"

examine the following code:

which of the following statements will be true if the variable courseName is defined as a private variable?

Given the following definition of the class Course:

what's the output of the following code?

Which of the following are valid lines of code to define a multidimensional
int array?