Simulador de preparacion exmen certificacion JAVA 7 developer

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Questão 1 de 53

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

Selecione uma ou mais das seguintes:

package statement
import statements
methods
variables
java compiler
java runtime environment

Explicação

Questão 2 de 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.

Selecione uma ou mais das seguintes:

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

Explicação

Questão 3 de 53

which of the following examples define the correct java class structure

Selecione uma ou mais das seguintes:

Explicação

Questão 4 de 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"

Selecione uma ou mais das seguintes:

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

Explicação

Questão 5 de 53

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

Selecione uma ou mais das seguintes:

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.

Explicação

Questão 6 de 53

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

Selecione uma ou mais das seguintes:

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[])

Explicação

Questão 7 de 53

select the correct options

Selecione uma ou mais das seguintes:

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

Explicação

Questão 8 de 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

Selecione uma ou mais das seguintes:

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

Explicação

Questão 9 de 53

examine the following code:

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

Selecione uma ou mais das seguintes:

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

Explicação

Questão 10 de 53

Given the following definition of the class Course:

what's the output of the following code?

Selecione uma ou mais das seguintes:

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

Explicação

Questão 11 de 53

Given the following code, select the correct options

Selecione uma ou mais das seguintes:

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

Explicação

Questão 12 de 53

Select all incorrect statements

Selecione uma ou mais das seguintes:

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

Explicação

Questão 13 de 53

which of the options are correct for the following code?

Selecione uma ou mais das seguintes:

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

Explicação

Questão 14 de 53

what is the output of the following code?

Selecione uma ou mais das seguintes:

Explicação

Questão 15 de 53

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

Selecione uma ou mais das seguintes:

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

Explicação

Questão 16 de 53

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

Selecione uma ou mais das seguintes:

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

Explicação

Questão 17 de 53

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

Selecione uma ou mais das seguintes:

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

Explicação

Questão 18 de 53

what is the output of the following code

Selecione uma ou mais das seguintes:

218
232
246
compilation error

Explicação

Questão 19 de 53

what is true about the following lines of code

Selecione uma ou mais das seguintes:

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

Explicação

Questão 20 de 53

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

Selecione uma ou mais das seguintes:

Explicação

Questão 21 de 53

how can you include encapsulation in your class design

Selecione uma ou mais das seguintes:

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

Explicação

Questão 22 de 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?

Selecione uma ou mais das seguintes:

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

Explicação

Questão 23 de 53

examine the following code and select the correct options

Selecione uma ou mais das seguintes:

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

Explicação

Questão 24 de 53

examine the following code and select the correct options

Selecione uma ou mais das seguintes:

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

Explicação

Questão 25 de 53

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

Selecione uma ou mais das seguintes:

Explicação

Questão 26 de 53

which of the following statements are true?

Selecione uma ou mais das seguintes:

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

Explicação

Questão 27 de 53

Given the following definition of class Person,

Selecione uma ou mais das seguintes:

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

Explicação

Questão 28 de 53

what is the ouput of the following code?

Selecione uma ou mais das seguintes:

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

Explicação

Questão 29 de 53

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

Selecione uma ou mais das seguintes:

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()

Explicação

Questão 30 de 53

given the following code,

Selecione uma ou mais das seguintes:

Compilation error
Rintime exception
int
String
long
Object

Explicação

Questão 31 de 53

examine the following code and select the correct options:

Selecione uma ou mais das seguintes:

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

Explicação

Questão 32 de 53

Select the incorrect options

Selecione uma ou mais das seguintes:

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() {}
}

Explicação

Questão 33 de 53

What is the output of the following code?

Selecione uma ou mais das seguintes:

4c010
4c10
113
103
Compilation error

Explicação

Questão 34 de 53

What is the output of the following code?

Selecione uma ou mais das seguintes:

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

Explicação

Questão 35 de 53

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

Selecione uma ou mais das seguintes:

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][];

Explicação

Questão 36 de 53

Which of the following statements are correct?

Selecione uma ou mais das seguintes:

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.

Explicação

Questão 37 de 53

Which of the following statements are correct?

Selecione uma ou mais das seguintes:

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.

Explicação

Questão 38 de 53

What is the output of the following code?

Selecione uma ou mais das seguintes:

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

Explicação

Questão 39 de 53

What is the output of the following code?

Selecione uma ou mais das seguintes:

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

Explicação

Questão 40 de 53

What is the output of the following code?

Selecione uma ou mais das seguintes:

gZmeAZ
gZmeAa
gZm
gZ
game

Explicação

Questão 41 de 53

What is the output of the following code?

Selecione uma ou mais das seguintes:

gZmeAZ
gZmeAa
gZm
gZ
game

Explicação

Questão 42 de 53

What is the output of the following code?

Selecione uma ou mais das seguintes:

12S512S5
12S12S
1025102S
dRuntime exception

Explicação

Questão 43 de 53

What is the output of the following code?

Selecione uma ou mais das seguintes:

521
Runtime exception
65321
65431

Explicação

Questão 44 de 53

What’s the output of the following code?

Selecione uma ou mais das seguintes:

Explicação

Questão 45 de 53

What’s the output of the following code?

Selecione uma ou mais das seguintes:

Explicação

Questão 46 de 53

Which of the following statements is true?

Selecione uma ou mais das seguintes:

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.

Explicação

Questão 47 de 53

What’s the output of the following code?

Selecione uma ou mais das seguintes:

true
false
ABC
false
ABC
true
ABC
Compilation error

Explicação

Questão 48 de 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?

Selecione uma ou mais das seguintes:

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);

Explicação

Questão 49 de 53

What’s the output of the following code?

Selecione uma ou mais das seguintes:

default
default
4
4
Compilation error

Explicação

Questão 50 de 53

What’s the output of the following code?

Selecione uma ou mais das seguintes:

default
case1
case2
case1
case2
case2
Compilation error
Runtime exception

Explicação

Questão 51 de 53

What’s the output of the following code?

Selecione uma ou mais das seguintes:

ejava
enum
guru
ejava
ejavaguru
e
ejava
enum
guru
ejavaguru

Explicação

Questão 52 de 53

What’s the output of the following code?

Selecione uma ou mais das seguintes:

else
0
1
2
0
1
Compilation error

Explicação

Questão 53 de 53

What’s the output of the following code?

Selecione uma ou mais das seguintes:

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

Explicação

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	Criado por JUAN JOSÈ ORJUEL aproximadamente 9 anos atrás

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

Simulador de preparacion exmen certificacion JAVA 7 developer

Questão 1 de 53

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

Selecione uma ou mais das seguintes:

Explicação

Questão 2 de 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.

Selecione uma ou mais das seguintes:

Explicação

Questão 3 de 53

which of the following examples define the correct java class structure

Selecione uma ou mais das seguintes:

Explicação

Questão 4 de 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"

Selecione uma ou mais das seguintes:

Explicação

Questão 5 de 53

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

Selecione uma ou mais das seguintes:

Explicação

Questão 6 de 53

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

Selecione uma ou mais das seguintes:

Explicação

Questão 7 de 53

select the correct options

Selecione uma ou mais das seguintes:

Explicação

Questão 8 de 53

Selecione uma ou mais das seguintes:

Explicação

Questão 9 de 53

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

Selecione uma ou mais das seguintes:

Explicação

Questão 10 de 53

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

Selecione uma ou mais das seguintes:

Explicação

Questão 11 de 53

Given the following code, select the correct options

Selecione uma ou mais das seguintes:

Explicação

Questão 12 de 53

Select all incorrect statements

Selecione uma ou mais das seguintes:

Explicação

Questão 13 de 53

which of the options are correct for the following code?

Selecione uma ou mais das seguintes:

Explicação

Questão 14 de 53

what is the output of the following code?

Selecione uma ou mais das seguintes:

Explicação

Questão 15 de 53

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

Selecione uma ou mais das seguintes:

Explicação

Questão 16 de 53

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

Selecione uma ou mais das seguintes:

Explicação

Questão 17 de 53

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

Selecione uma ou mais das seguintes:

Explicação

Questão 18 de 53

what is the output of the following code

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Explicação

Questão 19 de 53

what is true about the following lines of code

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Explicação

Questão 20 de 53

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

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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?