Computer Programming 2

Which of the following methods is allowed to be overriden?

• public no_override void setName(){}
• public void setName(){}
• public final void setName(){}
• public static void setName(){}
• None of the above

What is the output of the code snippet below: void main(){test();test();} void test(){System.out.print(“1”);}

• 11

What will be the output if you execute this code?do{System.out.println("Hello World!");}while(true);

• None of the above
• The code will not run because of syntax error
• Do nothing
• print "Hello World" infinitely
• print "Hello World"

Multiple-Choice. Please select the best answer for the question. What will be the result if you execute this expression x=true ? 1 : 0;?

• 1
• 0
• false
• true
• none of the above

What is the output of the code snippet below: void main(){test(“11”);test(“1”);} void test(String x){System.out.print(x + x);}

• 111111

It is used to access the instance variables shadowed by the parameters.

• this

What is the output of the code snippet below: void main(){test(=E2=80=9C11=E2=80=9D);test(=E2=80=9C1=E2=80=9D);} void test(String x){System.out.print(x + x);}

• 222
• 111111
• 6
• None of the choices

What was the initial name for the Java programming language?

• Oak

What will happen if you use JOptionPane. showInputDialog statement in your program?

• The program will display an input dialog box that allows the user to input text and returns String value
• The program will display message dialog box
• None of the above
• The program will display message dialog box returns String value
• The program will display an input dialog box that allows the user to input text and returns the correct type value

Which of the following is not a java keyword?

• goto
• else
• if
• None of the above
• name

Which of the following is a correct declaration of an array?

• Double[ ] dbl= new Double(5);
• StudentRecord sr=new StudentRecord[100];
• PaySlip[ ] ps=new ps;
• None of the choices
• EmployeeRecord[ ][ ] er=new EmployeeRecord[10][10];

What will happen if you use JOptionPane.showMessageDialog statement in your program?

• The program will display an input dialog box that allows the user to input text and returns String value
• The program will display message dialog box
• None of the above
• The program will display message dialog box returns String value
• The program will display an input dialog box that allows the user to input text and returns the correct type value

What will happen if we compile the statement below?~System.out.println(=E2=80=9CHello World!=E2=80=9D)

• There will be a syntax error after compilation
• There will be a logical error after compilation
• There will be a runtime error after compilation
• None of the Above
• There will be no error after compilation

Which of the following is a valid nextInt() return value?

• 1010
• long value
• floating-point literal
• None of the above
• 31416

Why do we need to set the path for javac in command line?

• To resolve runtime error
• It is part of the compilation process
• None of the Above
• To make javac available or accessible in command line
• To resolve syntax error

What is the result if we execute this: “a” instanceof String; ?

• true

What will be the value of x after you execute this statement int z=0; for(int x=0; x

• None of these

What will happen if we compile the statement below? ~System.out.println(“Hello World!”)

• There will be a syntax error after compilation.

What keyword is used to perform class inheritance?

• extends
• derives
• inherits
• implements
• None of the above

What is the correct statement to compile Java program in command line?

• javac HelloWorld
• java HelloWorldjava
• javac HelloWorldjava
• java HelloWorld

What is the output of the code snippet below: int[] intArray = { 1, 2, 3, 5, 6, 7 }; for(int x = intArray.length-1; x>=0; x--){System.out.print(intArray[x]);}

• 765321

Which of the following has the correct form for an if statement?

• if boolean_expression
• boolean_expression
• if (boolean_expression)
• none of the above

What will be the value of x if we execute this: String s = "25"; int x = Integer.parseInt(s); ?

• int 25
• String 25
• The code is not valid
• 0
• None of the above

What is the result if we execute this: =E2=80=9Ca=E2=80=9D.equals(=E2=80=9Ca=E2=80=9D);?

• false
• =E2=80=9Ca=E2=80=9D
• true
• None of the above
• The code is not valid

What is the name of this method: int test(){return 1;} ?

• 7
• None of the choices
• int
• 6
• test

Since Java uses a virtual machine, what does that mean about the versatility of Java?

• None of the Above
• It can run most anywhere without modification
• Code Security
• It is used almost exclusively on Intel platforms
• It will run on Windows, Linux, Unix, but not Apple

Multiple-Choice. Please select the best answer for the question.Which of the following a valid Java identifier?

• $id
• id
• id_1
• all of the above
• _id

Which of the following is true about Interface?

• All of the above
• It defines a standard and public way of specifying the behavior of classes
• It is use to model multiple inheritance which allows a class to have more than one superclass
• It is a special kind of block containing method signatures only
• It defines the signatures of a set of methods without the body

What will be the output if you execute this code? do{System.out.println("Hello World!");}while(false);

• print "Hello World"

Can we directly compile codes from notepad?

• Yes, Because we can call Java compiler from notepad
• It depends, if there is a compiler embedded in Notepad
• Both A and C are correct
• No, We can only write codes in Notepad

Which of the following is a valid identifier?

• true
• static
• name
• None of the above
• public

When was the officially released of Java?

• 1991
• None of the Above
• 1995
• 1992
• 1996

Which of the following is the correct way to define an interface?

• public interface [InterfaceName] {}
• public [InterfaceName] {}
• interface: [InterfaceName]
• public class interface [InterfaceName] {}

Which of the following is the correct way to call the constructor of the parent class?

• thiscall()
• super()
• supercall()
• this()

what will be the output if you execute this code? int x=1; switch(x){ case 1: System.out.print(“1”); case 2: System.out.print(“1”); case 3: System.out.print(“1”); default: System.out.print(“1”); }

• display 1111

Which statement will check if x is equal to y?

• if (x>y)
• if (x<>y)
• none of the above
• if (y>y)
• if (x!<y)

It is the method of hiding certain elements of the implementation of a certain class?

• Encapsulation
• Class
• Object
• None of the above
• Object Oriented

What type of value does the nextLine() returns?

• None of the above
• Line
• double
• String
• long

It used to read values from class variables?

• Accessor

Which of the following array declarations is correct?

• double[ ] grades;grades = new double[2];
• double[10] money=double[ ];
• byte[ ] b=byte[ 20];
• Integer i[ ]=new Integer;
• String names[20]=new String;

What is the output of the code snippet below: int[] intArray = { 1, 2, 3, 5, 6, 7 }; for(int x = intArray.length-1; x>=0; x--){System.out.print(intArray[x]);}

• 765321
• 12356
• 123567
• The given code is not valid
• none of the choices

Which of the following class declaration is not allowed to be inherited?

• public abstract class Person {}
• None of the above
• public class Person {}
• class Person{}
• public final class Person {}

Which of the following is the correct syntax to define a method?

• package ;

Which of the following is not a valid Float value?

• 12345678910F
• 123
• 12345E+3
• none of the above
• 34028235E+38F

What is the output of the code snippet below:void main(){test(1.0);test(1);}void test(double x){System.out.print(x); }void test(int x){System.out.print(x);}

• 1010
• None of the choices
• 11
• 10
• 101

What is the input for Java Compiler?

• Code
• Byte Code
• Native Code
• Source Code
• None of the Above

What is the return value of this method: int test(){return 1;} ?

• test
• All of the choices
• int
• return 1
• 1

Which of the following scenarios where an exception may occur?

• All of the choices

What is the result if we execute this: =E2=80=9Ca=E2=80=9D instanceof String; ?

• The code is not valid
• false
• true
• =E2=80=9Ca=E2=80=9D
• None of the above

True or False. Please select the best answer for the question.Java is a simple, object-oriented, portable and robust computer language.

• True
• False

Which statement will check if x is less than y?

• if (x<y);
• if (x>y)
• if (x>y)?:
• none of the above
• if (x<>y)

What is the length of the array: int[] intArray = { 1, 2, 3, 5, 6, 7 };

• 6

Use the __________ statement when traversing through arrays.

• whilewhile loop
• switch
• do-while loop
• for loop
• none of the choices

JVM is responsible for

• Generating bytecode
• None of the Above
• Compiling source code
• Interpreting bytecode
• Reading bytecode

True or False. Please select the best answer for the question.byte, short, int, and for are one of Java's Primitive data types.

• True
• False

True or False. Please select the best answer for the question.Repetition is one of Java's control structures

• True
• False

The Java feature, &quot;write once, run anywhere&quot;, is termed as

• Object Oriented
• None of the Above
• Platform independent
• High Performance
• Robust

What does Java generate after compiling the java source code?

• Class Code
• Image file
• Executable file
• None of the Above
• Byte Code

Which of the following is a valid editor for java source code?

• All of the choices

Which of the following creates an instance of a class?

• Test t = new Test();
• All of the choices
• String str = new String();
• Object obj = new Object();

True or False. Please select the best answer for the question.Java's control structures are branching, decision, and multithreaded.

• True
• False

What do you call a blueprint of an object?

• Object
• None of the above
• Class
• Constructor
• Method

Multiple-Choice. Please select the best answer for the question.Which is not a repetition control structure?

• loop
• None of the above
• do-while
• for
• while

Which is not a repetition control structure?

• None of the choices
• switch
• do while
• for
• while

What is the return value of this method: public void sum(){int x=1;} ?

• 1
• sum
• none of the choices
• void
• x

What is the index number of the last element of an array with 30 elements?

• 29

Which of the following is the correct way to use an interface?

• public class Person use [InterfaceName] {}
• public class Person extends [InterfaceName] {}
• public class Person implements [InterfaceName] {}
• None of the above
• public class Person apply [InterfaceName] {}

What do you call a variable that belong to the whole class?

• None of the above
• Class Variable
• Class Method
• Static Variable
• Object Variable

What will be the value of x after you execute this statement int z=0; for(int x=0; x<10; x++) for(int y=0; y<x; y++) z*=(x*y);

• None of the Choice

The __________ keyword allocates memory for the array being declared.

• new
• array
• int
• intArray
• None of the above

What will be the value of x after executing this code for(int x=0; x<=11; x++) {} is run?

• 12

What will be the output if you execute this code: int a[] = new int[1]; System.out.println(a[1]);

• It will produce an exception.

Which of the following is true about Runtime errors:

• Runtime errors occur after compilation
• Runtime errors occur during run-time
• Runtime errors occur when there is a design flaw in your program
• All of the above
• None of the Above

what will be the output if you execute this code? int x=2; switch(x){ case 1: System.out.print(“1”); case 2: System.out.print(“1”); case 3: System.out.print(“1”); default: System.out.print(“1”); }

• display 111

Multiple-Choice. Please select the best answer for the question.Which statement will check if x is less than y?

• if (x>y)?:
• if (x<=y)
• if (x<y);
• none of the above
• if (x>y)

Which of the following is not a Java comment?

• None of the above
• Multi-Line Comments
• Single Line Comments
• Declaration Comments
• Documentation Comments

Declare a two-dimensional integer array named values of size 6 columns and 4 rows.

• int[ ][ ] values=new int[4][6];
• int[ 6][4 ] values=new int;
• int values=new int[6][4];
• int[ ][ ] values=new int[6][4];
• None of the above

Which of the following correctly accesses the sixth element stored in an array of 10 elements?

• stringArray[5];

Which of the following is true about constructor?

• All of the choices

Which of the following is not an escape sequence?

• t
• b
• none of the above
• f

Which of the following we are not allowed to write java source code?

• Notepad
• eclipse
• BlueJ
• None of the Above
• NetBeans

True or False. Please select the best answer for the question.Portable is one of Java's control structures

• True
• False

What is the result if we execute this: “a”.equals(“a”);?

• true

It is a template for creating an object?

• None of the above
• Object Oriented
• Method
• Class
• Encapsulation

Which of the following declares an array of int named intArray?

• All of these

Which of the following method reads input from the user and return String value?

• nextLine()
• nextString()
• All of the above
• nextText()
• nextValue()

Which of the following does not return numeric value?

• None of these

What will be the output if you execute this code? do{System.out.println(&quot;Hello World!&quot;);}while(true);

• print &quot;Hello World&quot; infinitely

Which of the following method is allowed to be overriden?

• public final void setName(){}

True or False. Please select the best answer for the question.Java is architecture neutral

• True
• False

Which of the following shows a valid Overloading method?

• none of the choices
• void test(int x){} void test(int y){}
• All of the choices
• void test(char x, int y){} void test(int x, char y){}
• void test(){} void test(){}

Multiple-Choice. Please select the best answer for the question.Which is not a decision control structure?

• switch
• if else-if else
• if else
• None of the above
• if

From the array int[] intArray = { 1, 2, 3, 5, 6, 7 };, what is the value of intArray[2]?

• 3

Multiple-Choice. Please select the best answer for the question.Which of the following has the correct form for an if statement?

• none of the above
• if boolean_expression
• if { boolean_expression }
• boolean_expression
• if (boolean_expression)

What is floating-point literal?

• Can be express in scientific notation
• All of the above
• An integer literal with decimal point
• By default it is double type
• It could be double or float value

What is the correct statement to run Java program in command line?

• None of the Above
• java HelloWorld
• javac HelloWorldjava
• java HelloWorldjava
• javac HelloWorld

Which of the following is a valid multidimensional array?

• All of these

__________ is implemented in at least two classes with inheritance relationship.

• Inheritance
• None of the options
• Overriding
• Polymorphism
• Overloading

Which of the following class declaration is not allowed to be instantiated?

• public abstract class Person {}
• class Person{}
• public class Person {}
• None of the above
• public final class Person {}

What will be the output if you execute this code?do{System.out.println(&quot;Hello World!&quot;);}while(false);

• None of the above
• Do nothing
• The code will not run because of syntax error
• print &quot;Hello World&quot;
• print &quot;Hello World&quot; infinitely

What is the output of the code snippet below: int[] intArray = new int[10]; for(int x = 0; x <intArray.length; x++) {System.out.print(intArray[x]);}

• 0000000000

What will be the value of x after executing this codefor(int x=0; x<=10; x++) {} is run?

• none of the above
• 11
• 10
• 1
• 0

What did java generates after compiling the java source code?

• Byte Code

The length of an array is established when the array is created at __________.

• None of the above
• runtime
• initialization
• compile time
• declaration

Which of the following a valid Java identifier?

• all of the above
• id
• id_1
• $id
• _id

Which of the following show casting object?

• (className) object;
• Employee emp = new Employee(); VicePresident veep = new VicePresident(); veep = (VicePresident)emp;
• SuperClass sc = new SuperClass(); SubClass sbc = new SubClass(); sbc = (SubClass) sc;
• All of the choices

True or False. Please select the best answer for the question.for, while and do-while is part of Java's Repetition Control Structures

• True
• False

Multiple-Choice. Please select the best answer for the question.Which of the following is not a primitive data type?

• none of the above
• int
• byte
• String
• double

Multiple-Choice. Please select the best answer for the question.Which of the following is not a Java Literal?

• Boolean value
• Integer value
• None of the above
• Float value
• Character value

The feature of Java which makes it possible to execute several tasks simultaneously.

• Multithreaded

What is the extension name of a Java Source code?

• j
• None of the Above
• java
• class
• javac

What is the return type of this method: int test(){return 1;} ?

• test()
• 1
• None of the above
• void
• int

True or False. Please select the best answer for the question.float is one of Java's Primitive data types

• True
• False

Which of the following is not the feature of java?

• Static

Which of the following is a valid nexDouble() return value?

• 31416
• double value
• floating-point literal
• 120
• All of the above

It is the ability of an object to have many forms?

• Abstraction
• Polymorphism
• Inheritance
• Interface
• None of the above

Which of the following is a valid statement to accept String input?

• String num = scannextText();
• None of the above
• string str = scannextShort();
• String str = JOptionPaneshowInputDialog(&quot;&quot;);
• String str = scannextString();

From the array int[] intArray = { 1, 2, 3, 5, 6, 7 };, what is the value of intArray[3]?

• 5

Which of the following is true about syntax errors:

• Incorrect capitalization leads to syntax error
• Syntax errors are usually typing errors
• All of the above
• You will have syntax errors if you misspell the Java command
• None of the Above

Which is not a decision control structure?

• if else
• if
• if else-if else
• switch
• None of the above

Which of the following is a valid statement to accept int input? Let us assume that we have declared scan as Scanner.

• int num = scannextLong();
• short num = scannextInt();
• short num = scannextShort();
• int num = scangetInt();
• None of the above

Declare and initialize a double data type array named numbers with the following values: 23.35, 34.45, 56.77.

• double[ ] numbers={2335, 3445, 5677};
• double[ ] numbers={&quot;2335, 3445, 5677&quot;};
• None of the choices
• double[3] numbers={2335, 3445, 5677};
• Double[ ] number={2335, 3445, 5677};

True or False. Please select the best answer for the question.Java SE is a Java Platform

• True
• False

Can we directly compile codes from NetBeans?

• It depends, if there is a compiler embedded in NetBeans
• No, we can only write codes in NetBeans
• Yes, because we can call Java compiler from NetBeans
• Both A and C are correct

What is the output of the code snippet below: void main(){test(1.0); test(1);} void test(double x){ System.out.print(x); } void test(int x){ System.out.print(x);}

• 1.01

What is the maximum index of the array: int[] intArray = { 1, 2, 3, 5, 6, 7 };

• 5

Which of the following is a valid method name:

• compute
• final
• int
• compute grade
• none of the choices

Which of the following is not Java Literal?

• Character value
• Boolean value
• None of the above
• Integer value
• Float value

Which of the following shows Overloading method?

• void test(int x){} void test(double x){}
• None of the above
• void test(){} void test(){}
• All of the above
• void test(int x){} void test(int y){}

What will be the value of x after executing this code for(int x=0; x<=10; x++) {} is run?

• 11

Which of the following is a valid nextByte() return value?

• 3
• short value
• None of the above
• 128
• int value

Which of the following is not a valid variable declaration in Java?

• int x = 1;
• int x;
• float x = 20D;
• short x;
• None of the above

What will be the value of x after you execute this statementint z=0; for(int x=0; x<10; x++) for(int y=0; y<x; y++) z*=(x*y);

• 128
• None of the above
• 236
• 512
• 1

Which of the following is not a primitive data type?

• byte
• short
• none of the above
• long
• String

Which of the following is a jump statement in java?

• break
• jump
• continue
• else
• default

True or False. Please select the best answer for the question.Java is secured

• True
• False

What do you call a class that inherits a class?

• Parent class
• Class
• Superclass
• Subclass
• None of the above

Multiple-Choice. Please select the best answer for the question.What will be the value of x after you execute this statement int z=0; for(int x=0; x<10; x++) for(int y=0; y<x; y++) z*=(x*y);?

• 236
• 128
• 512
• None of the above
• 1

What is the index number of the last element of an array with 20 elements?

• 19

What is the correct statement to set javac path in command line?

• None of the Above
• set path=C:Program FilesJava
• All of the above
• javac
• set path
• C:Program FilesJavajdk160_23bin
• path=C:Program FilesJavajdk160_23bin

Which of the following will do implicit cast?

• None of the above
• String x = =E2=80=9C0=E2=80=9D; int y = x;
• All of the above
• short x=1; int y = x;
• Object obj = new Object();

What is the output of the code snippet below: void main(){test();test();} void test(){System.out.print(=E2=80=9C1=E2=80=9D);}

• 2
• 11
• 3
• 1
• None of the choices

How many elements could be assigned to an array location with 5 columns and 3 rows?

• 5
• 15
• 8
• 3
• None of the choices

what will be the output if you execute this code?int x=1;switch(x){case 1: System.out.print(=E2=80=9C1=E2=80=9D);case 2: System.out.print(=E2=80=9C1=E2=80=9D);case 3: System.out.print(=E2=80=9C1=E2=80=9D);default: System.out.print(=E2=80=9C1=E2=80=9D);}

• None of the above}
• display 1234
• display nothing
• display 1111
• display 1

What is the output of the code snippet below: int[] intArray = new int[10];for(int x = 0; x<intArray.length; x++){System.out.print(intArray[x]);}

• 0000000000
• 012356789
• The given code is not valid
• 1235678910
• none of the choices