Explore topic-wise MCQs in Testing Subject.

This section includes 657 Mcqs, each offering curated multiple-choice questions to sharpen your Testing Subject knowledge and support exam preparation. Choose a topic below to get started.

1.

What is the replacement of joda time library in java 8?

A. Java.time (JSR-310)
B. java.date (JSR-310)
C. java.joda
D. java.jodaTime
Answer» B. java.date (JSR-310)
Discussion
2.

How to identify if a timezone is eligible for DayLight Saving?

A. useDaylightTime() of Time class
B. useDaylightTime() of Date class
C. useDaylightTime() of TimeZone class
D. useDaylightTime() of DateTime class
Answer» D. useDaylightTime() of DateTime class
Discussion
3.

Is SimpleDateFormat thread safe?

A. True
B. False
Answer» C.
Discussion
4.

How to convert a String to a Date object?

A. SimpleDateFormat sdf = new SimpleDateFormat(“yyyy-mm-dd”); sdf.parse(new Date());
B. SimpleDateFormat sdf = new SimpleDateFormat(“yyyy-mm-dd”); sdf.format(new Date());
C. SimpleDateFormat sdf = new SimpleDateFormat(“yyyy-mm-dd”); new Date().parse();
D. SimpleDateFormat sdf = new SimpleDateFormat(“yyyy-mm-dd”); new Date().format();
Answer» B. SimpleDateFormat sdf = new SimpleDateFormat(“yyyy-mm-dd”); sdf.format(new Date());
Discussion
5.

How to convert Date object to String?

A. SimpleDateFormat sdf = new SimpleDateFormat(“yyyy-mm-dd”); sdf.parse(new Date());
B. SimpleDateFormat sdf = new SimpleDateFormat(“yyyy-mm-dd”); sdf.format(new Date());
C. SimpleDateFormat sdf = new SimpleDateFormat(“yyyy-mm-dd”); new Date().parse();
D. SimpleDateFormat sdf = new SimpleDateFormat(“yyyy-mm-dd”); new Date().format();
Answer» C. SimpleDateFormat sdf = new SimpleDateFormat(“yyyy-mm-dd”); new Date().parse();
Discussion
6.

How to format date from one form to another?

A. SimpleDateFormat
B. DateFormat
C. SimpleFormat
D. DateConverter
Answer» B. DateFormat
Discussion
7.

public class AddDemo { public static void main(String args[]) { BigDecimal b = new BigDecimal("23.43"); BigDecimal br = new BigDecimal("24"); BigDecimal bres = b.add(new BigDecimal("450.23")); System.out.println("Add: "+bres); MathContext mc = new MathContext(2, RoundingMode.DOWN); BigDecimal bdecMath = b.add(new BigDecimal("450.23"), mc); System.out.println("Add using MathContext: "+bdecMath); } }

A. Compilation failure
B. Add: 684.66 Add using MathContext: 6.8E+2
C. Runtime exception
D. Add 6.8E+2 Add using MathContext: 684.66
Answer» C. Runtime exception
Discussion
8.

Which class is a library of functions to perform arithmetic operations of BigInteger and BigDecimal?

A. MathContext
B. MathLib
C. BigLib
D. BigContext
Answer» B. MathLib
Discussion
9.

What is BigDecimal.ONE?

A. wrong statement
B. custom defined statement
C. static variable with value 1 on scale 10
D. static variable with value 1 on scale 0
Answer» E.
Discussion
10.

BigDecimal is a part of which package?

A. java.lang
B. java.math
C. java.util
D. java.io
Answer» C. java.util
Discussion
11.

Which of the following is not provided by BigDecimal?

A. scale manipulation
B. + operator
C. rounding
D. hashing
Answer» C. rounding
Discussion
12.

What is the limitation of toString() method of BigDecimal?

A. There is no limitation
B. toString returns null
C. toString returns the number in expanded form
D. toString uses scientific notation
Answer» E.
Discussion
13.

What is the base of BigDecimal data type?

A. Base 2
B. Base 8
C. Base 10
D. Base e
Answer» D. Base e
Discussion
14.

What is the output of below code snippet? double a = 0.02; double b = 0.03; double c = b - a; System.out.println(c); BigDecimal _a = new BigDecimal("0.02"); BigDecimal _b = new BigDecimal("0.03"); BigDecimal _c = b.subtract(_a); System.out.println(_c);

A. 0.009999999999999998 0.01
B. 0.01 0.009999999999999998
C. 0.01 0.01
D. 0.009999999999999998
Answer» B. 0.01 0.009999999999999998
Discussion
15.

Which of the below data type doesn’t support overloaded methods for +,-,* and /?

A. int
B. float
C. double
D. BigDecimal
Answer» E.
Discussion
16.

Which of the following is the advantage of BigDecimal over double?

A. Syntax
B. Memory usage
C. Garbage creation
D. Precision
Answer» E.
Discussion
17.

Are enums are type-safe?

A. True
B. False
Answer» B. False
Discussion
18.

Which class does all the Enums extend?

A. Object
B. Enums
C. Enum
D. Enum Class
Answer» D. Enum Class
Discussion
19.

Which method returns the elements of Enum class?

A. getEnums()
B. getEnumConstants()
C. getEnumList()
D. getEnum()
Answer» C. getEnumList()
Discussion
20.

What is the output of below code snippet? enum Enums { A, B, C; private Enums() { System.out.println(10); } } public class MainClass { public static void main(String[] args) { Enum en = Enums.B; } }

A. 10 10 10
B. Compilation Error
C. Runtime Exception
D. 10 10
Answer» B. Compilation Error
Discussion
21.

What is the output of below code snippet? enum Levels { private TOP, public MEDIUM, protected BOTTOM; }

A. Runtime Error
B. EnumNotDefined Exception
C. It runs successfully
D. Compilation Error
Answer» E.
Discussion
22.

What is the output of below code snippet? class A { } enum Enums extends A { ABC, BCD, CDE, DEF; }

A. Runtime Error
B. Compilation Error
C. It runs successfully
D. EnumNotDefined Exception
Answer» C. It runs successfully
Discussion
23.

If we try to add Enum constants to a TreeSet, what sorting order will it use?

A. Sorted in the order of declaration of Enums
B. Sorted in alphabetical order of Enums
C. Sorted based on order() method
D. Sorted in descending order of names of Enums
Answer» B. Sorted in alphabetical order of Enums
Discussion
24.

enum Season { WINTER, SPRING, SUMMER, FALL }; System.out.println(Season.WINTER.ordinal());

A. 0
B. 1
C. 2
D. 3
Answer» B. 1
Discussion
25.

Can we create instance of Enum outside of Enum itself?

A. True
B. False
Answer» C.
Discussion
26.

What is the order of variables in Enum?

A. Ascending order
B. Descending order
C. Random order
D. depends on the order() method
Answer» B. Descending order
Discussion
27.

What is the output of this program? class asciicodes { public static void main(String args[]) { char var1 = 'A'; char var2 = 'a'; System.out.println((int)var1 + " " + (int)var2); } }

A. 162
B. 65 97
C. 67 95
D. 66 98
Answer» C. 67 95
Discussion
28.

What is the output of this program? class booloperators { public static void main(String args[]) { boolean var1 = true; boolean var2 = false; System.out.println((var2 & var2)); }

A. 0
B. 1
C. True
D. False
Answer» E.
Discussion
29.

What is the output of this program? class mainclass { public static void main(String args[]) { boolean var1 = true; boolean var2 = false; if (var1) System.out.println(var1); else System.out.println(var2); } }

A. 0
B. 1
C. True
D. False
Answer» D. False
Discussion
30.

What is the output of this program? class mainclass { public static void main(String args[]) { char a = 'A'; a++; System.out.print((int)a); } }

A. 66
B. 67
C. 55
D. 54
Answer» B. 67
Discussion
31.

What is the output of this program? class array_output { public static void main(String args[]) { char array_variable [] = new char[10]; for (int i = 0; i < 10; ++i) { array_variable[i] = 'i'; System.out.print(array_variable[i] + "" ); i++; } } }

A. i i i i i
B. 0 1 2 3 4
C. i j k l m
D. None of the mentioned
Answer» B. 0 1 2 3 4
Discussion
32.

Which one is a valid declaration of a boolean?

A. boolean b1 = 1;
B. boolean b2 = ‘false’;
C. boolean b3 = false;
D. boolean b4 = ‘true’
Answer» D. boolean b4 = ‘true’
Discussion
33.

Which of these occupy first 0 to 127 in Unicode character set used for characters in Java?

A. ASCII
B. ISO-LATIN-1
C. None of the mentioned
D. ASCII and ISO-LATIN1
Answer» E.
Discussion
34.

Which of these values can a boolean variable contain?

A. True & False
B. 0 & 1
C. Any integer value
D. true
Answer» B. 0 & 1
Discussion
35.

Which of these coding types is used for data type characters in Java?

A. ASCII
B. ISO-LATIN-1
C. UNICODE
D. None of the mentioned
Answer» D. None of the mentioned
Discussion
36.

What is the numerical range of a char data type in Java?

A. -128 to 127
B. 0 to 256
C. 0 to 32767
D. 0 to 65535
Answer» E.
Discussion
37.

What is the output of this program? class area { public static void main(String args[]) { double r, pi, a; r = 9.8; pi = 3.14; a = pi * r * r; System.out.println(a); } }

A. 301.5656
B. 301
C. 301.56
D. 301.56560000
Answer» B. 301
Discussion
38.

What is the output of this program? class increment { public static void main(String args[]) { int g = 3; System.out.print(++g * 8); } }

A. 25
B. 24
C. 32
D. 33
Answer» D. 33
Discussion
39.

What will be the output of these statement? class output { public static void main(String args[]) { double a, b,c; a = 3.0/0; b = 0/4.0; c=0/0.0; System.out.println(a); System.out.println(b); System.out.println(c); } }

A. Infinity
B. 0.0
C. NaN
D. all of the mentioned
Answer» E.
Discussion
40.

What is the output of this program? class average { public static void main(String args[]) { double num[] = {5.5, 10.1, 11, 12.8, 56.9, 2.5}; double result; result = 0; for (int i = 0; i < 6; ++i) result = result + num[i]; System.out.print(result/6); } }

A. 16.34
B. 16.566666644
C. 16.46666666666667
D. 16.46666666666666
Answer» D. 16.46666666666666
Discussion
41.

Which data type value is returned by all transcendental math functions?

A. int
B. float
C. double
D. long
Answer» D. long
Discussion
42.

Which of these literals can be contained in float data type variable?

A. -1.7e+308
B. -3.4e+038
C. +1.7e+308
D. -3.4e+050
Answer» C. +1.7e+308
Discussion
43.

An expression involving byte, int, and literal numbers is promoted to which of these?

A. int
B. long
C. byte
D. float
Answer» B. long
Discussion
44.

Which of the following are legal lines of Java code? 1. int w = (int)888.8; 2. byte x = (byte)100L; 3. long y = (byte)100; 4. byte z = (byte)100L;

A. 1 and 2
B. 2 and 3
C. 3 and 4
D. All statements are correct.
Answer» E.
Discussion
45.

What is the range of byte data type in Java?

A. -128 to 127
B. -32768 to 32767
C. -2147483648 to 2147483647
D. None of the mentioned
Answer» B. -32768 to 32767
Discussion
46.

What is the range of short data type in Java?

A. -128 to 127
B. -32768 to 32767
C. -2147483648 to 2147483647
D. None of the mentioned
Answer» C. -2147483648 to 2147483647
Discussion
47.

A magnetic tape volume that is used on a data processing operation without any change to its contents is

A. Magnetic disk
B. Magnetic disk
C. Master tape
D. Card reader
Answer» D. Card reader
Discussion
48.

Which of these access specifiers can be used for an interface?

A. Public
B. Protected
C. Private
D. All of the mentioned
Answer» B. Protected
Discussion
49.

Which of these class extend InputStream class?

A. ObjectStream
B. ObjectInputStream
C. ObjectOutput
D. ObjectInput
Answer» C. ObjectOutput
Discussion
50.

class A { protected int method1(int a, int b) { return 0; } } Which is valid in a class that extends class A?

A. public int method1(int a, int b) {return 0; }
B. private int method1(int a, int b) { return 0; }
C. public short method1(int a, int b) { return 0; }
D. static protected int method1(int a, int b) { return 0; }
Answer» B. private int method1(int a, int b) { return 0; }
Discussion