Computer Programming 2

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

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

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 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

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();

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

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

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

• 29

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

• print "Hello World"

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 {}

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

• True
• False

Which of the following method is allowed to be overriden?

• public final void setName(){}

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

• 5

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

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

What type of value does the nextLine() returns?

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

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

• True
• False

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

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 {}

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

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 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 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

Which of the following is not Java Literal?

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

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 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;

Which of the following is not a valid Float value?

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

Which of the following is true about constructor?

• All of the choices

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

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

• 11

JVM is responsible for

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

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

• All of these

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

• True
• False

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

What is the extension name of a Java Source code?

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

Which of the following is a valid method name:

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

The __________ keyword allocates memory for the array being declared.

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

What was the initial name for the Java programming language?

• Oak

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

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

Which of the following a valid Java identifier?

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

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

What do you call a class that inherits a class?

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

Which of the following does not return numeric value?

• None of these

It is a template for creating an object?

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

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

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

When was the officially released of Java?

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

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

• All of the choices

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

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

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

Which is not a repetition control structure?

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

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

What is the input for Java Compiler?

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

What does Java generate after compiling the java source code?

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

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

• True
• False

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

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

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

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

Which of the following is a jump statement in java?

• break
• jump
• continue
• else
• default

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

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 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 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)

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)

Which of the following is a valid identifier?

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

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

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

• 11

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

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

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

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

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

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(){}

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

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

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

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

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

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

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

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

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

• this

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};

Use the __________ statement when traversing through arrays.

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

It used to read values from class variables?

• Accessor

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();

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

• None of these

Which of the following scenarios where an exception may occur?

• All of the choices

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 creates an instance of a class?

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

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

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 syntax to define a method?

• package ;

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){}

Which of the following is not a primitive data type?

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

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

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 correct statement to run Java program in command line?

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

What did java generates after compiling the java source code?

• Byte Code

Which of the following is not an escape sequence?

• t
• b
• none of the above
• f

Which of the following is not a java keyword?

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

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

• True
• False

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

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

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

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

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

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

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

• True
• False

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

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

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

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

• true

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

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

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

• There will be a syntax error after compilation.

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 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 after executing this code for(int x=0; x<=11; x++) {} is run?

• 12

What keyword is used to perform class inheritance?

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

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

• 5

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.byte, short, int, and for are one of Java's Primitive data types.

• True
• False

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)

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

• 6

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

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 of the following is not the feature of java?

• Static

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

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

• True
• False

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

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

Which is not a decision control structure?

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

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 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

Which of the following is not a Java comment?

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

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

Which of the following is a valid multidimensional array?

• All of these

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

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

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

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

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

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

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

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

• true

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

• Multithreaded

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];

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

• 19

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

• stringArray[5];

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.

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.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