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MCQOPTIONS
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 output of this program? import java.lang.System; class Output { public static void main(String args[]) { byte a[] = { 65, 66, 67, 68, 69, 70 }; byte b[] = { 71, 72, 73, 74, 75, 76 }; System.arraycopy(a, 0, b, 0, a.length); System.out.print(new String(a) + " " + new String(b)); } } |
| A. | ABCDEF ABCDEF |
| B. | ABCDEF GHIJKL |
| C. | GHIJKL ABCDEF |
| D. | GHIJKL GHIJKL |
| Answer» B. ABCDEF GHIJKL | |
| 2. |
What is the output of this program? import java.lang.System; class Output { public static void main(String args[]) { long start, end; start = System.currentTimeMillis(); for (int i = 0; i < 10000000; i++); end = System.currentTimeMillis(); System.out.print(end - start); } } |
| A. | 0 |
| B. | 1 |
| C. | 1000 |
| D. | System Dependent |
| Answer» E. | |
| 3. |
Which of these values are returns under the case of normal termination of a program? |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | 3 |
| Answer» B. 1 | |
| 4. |
Which of these method can set the out stream to OutputStream? |
| A. | setStream() |
| B. | setosteam() |
| C. | setOut() |
| D. | streamtoOstream() |
| Answer» D. streamtoOstream() | |
| 5. |
Which of these methods loads the specified dynamic library? |
| A. | load() |
| B. | library() |
| C. | loadlib() |
| D. | loadlibrary() |
| Answer» B. library() | |
| 6. |
Which of these methods initiates garbage collection? |
| A. | gc() |
| B. | garbage() |
| C. | garbagecollection() |
| D. | Systemgarbagecollection() |
| Answer» B. garbage() | |
| 7. |
Which of these exceptions is thrown by methods of System class? |
| A. | IOException |
| B. | SystemException |
| C. | SecurityException |
| D. | InputOutputException |
| Answer» D. InputOutputException | |
| 8. |
What is the output of this program? class Output { public static void main(String args[]) { double x = 2.0; double y = 3.0; double z = Math.pow( x, y ); System.out.print(z); } } |
| A. | 2.0 |
| B. | 4.0 |
| C. | 8.0 |
| D. | 9.0 |
| Answer» D. 9.0 | |
| 9. |
What is the output of this program? class Output { public static void main(String args[]) { double x = 3.1; double y = 4.5; double z = Math.max( x, y ); System.out.print(z); } } |
| A. | true |
| B. | flase |
| C. | 3.1 |
| D. | 4.5 |
| Answer» E. | |
| 10. |
What is the output of this program? class Output { public static void main(String args[]) { int x = 3.14; int y = (int) Math.abs(x); System.out.print(y); } } |
| A. | 0 |
| B. | 3 |
| C. | 3.0 |
| D. | 3.1 |
| Answer» C. 3.0 | |
| 11. |
What is the value of “d” after this line of code has been executed? double d = Math.round ( 2.5 + Math.random() ); |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 2.5 |
| Answer» C. 4 | |
| 12. |
Which of these class encapsulate the run time state of an object or an interface? |
| A. | Class |
| B. | Object |
| C. | Runtime |
| D. | System |
| Answer» B. Object | |
| 13. |
Which of these class contains only floating point functions? |
| A. | Math |
| B. | Process |
| C. | System |
| D. | Object |
| Answer» B. Process | |
| 14. |
Which of these method is a rounding function of Math class? |
| A. | max() |
| B. | min() |
| C. | abs() |
| D. | all of the mentioned |
| Answer» E. | |
| 15. |
What is the value of double consonant ‘E’ defined in Math class? |
| A. | approximately 3 |
| B. | approximately 3.14 |
| C. | approximately 2.72 |
| D. | approximately 0 |
| Answer» D. approximately 0 | |
| 16. |
Which of these method of Object class can generate duplicate copy of the object on which it is called? |
| A. | clone() |
| B. | copy() |
| C. | duplicate() |
| D. | dito() |
| Answer» B. copy() | |
| 17. |
Which of these class is superclass of all other classes? |
| A. | Math |
| B. | Process |
| C. | System |
| D. | Object |
| Answer» E. | |
| 18. |
What is the output of this program? class Output { public static void main(String args[]) { byte a[] = { 65, 66, 67, 68, 69, 70 }; byte b[] = { 71, 72, 73, 74, 75, 76 }; System.arraycopy(a, 1, b, 3, 0); System.out.print(new String(a) + " " + new String(b)); } } |
| A. | ABCDEF GHIJKL |
| B. | ABCDEF GCDEFL |
| C. | GHIJKL ABCDEF |
| D. | GCDEFL GHIJKL |
| Answer» B. ABCDEF GCDEFL | |
| 19. |
What is the output of this program? class Output { public static void main(String args[]) { byte a[] = { 65, 66, 67, 68, 69, 70 }; byte b[] = { 71, 72, 73, 74, 75, 76 }; System.arraycopy(a, 2, b, 1, a.length-2); System.out.print(new String(a) + " " + new String(b)); } } |
| A. | ABCDEF GHIJKL |
| B. | ABCDEF GCDEFL |
| C. | GHIJKL ABCDEF |
| D. | GCDEFL GHIJKL |
| Answer» C. GHIJKL ABCDEF | |
| 20. |
What is the output of this program? class Output { public static void main(String args[]) { byte a[] = { 65, 66, 67, 68, 69, 70 }; byte b[] = { 71, 72, 73, 74, 75, 76 }; System.arraycopy(a , 0, b, 0, a.length); System.out.print(new String(a) + " " + new String(b)); } } |
| A. | ABCDEF ABCDEF |
| B. | ABCDEF GHIJKL |
| C. | GHIJKL ABCDEF |
| D. | GHIJKL GHIJKL |
| Answer» B. ABCDEF GHIJKL | |
| 21. |
What is the output of this program? class Output { public static void main(String args[]) { long start, end; start = System.currentTimeMillis(); for (int i = 0; i < 10000000; i++); end = System.currentTimeMillis(); System.out.print(end - start); } } |
| A. | 0 |
| B. | 1 |
| C. | 100 |
| D. | System Dependent |
| Answer» E. | |
| 22. |
Which of these class holds a collection of static methods and variables? |
| A. | Void |
| B. | Process |
| C. | Runtime |
| D. | System |
| Answer» E. | |
| 23. |
Which of the following is method of System class is used to find how long a program takes to execute? |
| A. | currenttime() |
| B. | currentTime() |
| C. | currentTimeMillis() |
| D. | currenttimeMillis() |
| Answer» D. currenttimeMillis() | |
| 24. |
Which of these class can encapsulate an entire executing program? |
| A. | Void |
| B. | Process |
| C. | Runtime |
| D. | System |
| Answer» C. Runtime | |
| 25. |
Standard output variable ‘out’ is defined in which class? |
| A. | Void |
| B. | Process |
| C. | Runtime |
| D. | System |
| Answer» E. | |
| 26. |
Which of the following method of Process class can terminate a process? |
| A. | void kill() |
| B. | void destroy() |
| C. | void terminate() |
| D. | void exit() |
| Answer» C. void terminate() | |
| 27. |
Which of these class have only one field ‘TYPE’? |
| A. | Void |
| B. | Process |
| C. | System |
| D. | Runtime |
| Answer» B. Process | |
| 28. |
What is the output of this program? class Output { public static void main(String args[]) { Long i = new Long(256); System.out.print(i.hashCode()); } } |
| A. | 256 |
| B. | 256.0 |
| C. | 256.00 |
| D. | 257.00 |
| Answer» B. 256.0 | |
| 29. |
What is the output of this program? class Output { public static void main(String args[]) { Integer i = new Integer(257); float x = i.floatValue(); System.out.print(x); } } |
| A. | 0 |
| B. | 1 |
| C. | 257 |
| D. | 257.0 |
| Answer» E. | |
| 30. |
What is the output of this program? class Output { public static void main(String args[]) { Integer i = new Integer(257); byte x = i.byteValue(); System.out.print(x); } } |
| A. | 0 |
| B. | 1 |
| C. | 256 |
| D. | 257 |
| Answer» C. 256 | |
| 31. |
What is the output of this program? class Output { public static void main(String args[]) { char a[] = {'a', '5', 'A', ' '}; System.out.print(Character.isDigit(a[0]) + " "); System.out.print(Character.isWhitespace(a[3]) + " "); System.out.print(Character.isUpperCase(a[2])); } } |
| A. | true false true |
| B. | false true true |
| C. | true true false |
| D. | false false false |
| Answer» C. true true false | |
| 32. |
Which of these methods is used to obtain value of invoking object as a long? |
| A. | long value() |
| B. | long longValue() |
| C. | Long longvalue() |
| D. | Long Longvalue() |
| Answer» C. Long longvalue() | |
| 33. |
Which of the following is method of wrapper Integer for converting the value of an object into int? |
| A. | bytevalue() |
| B. | int intValue(); |
| C. | Bytevalue() |
| D. | Byte Bytevalue() |
| Answer» C. Bytevalue() | |
| 34. |
Which of these is wrapper for simple data type char? |
| A. | Float |
| B. | Character |
| C. | String |
| D. | Integer |
| Answer» C. String | |
| 35. |
Which of these is a super class of wrappers Long, Character & Integer? |
| A. | Long |
| B. | Digits |
| C. | Float |
| D. | Number |
| Answer» E. | |
| 36. |
Which of the following methods is a method of wrapper Integer for obtaining hash code for the invoking object? |
| A. | int hash() |
| B. | int hashcode() |
| C. | int hashCode() |
| D. | Integer hashcode() |
| Answer» D. Integer hashcode() | |
| 37. |
Which of these is a wrapper for data type int? |
| A. | Integer |
| B. | Long |
| C. | Byte |
| D. | Double |
| Answer» B. Long | |
| 38. |
What is the output of this program? class binary { public static void main(String args[]) { int num = 17; System.out.print(Integer.toBinaryString(num)); } } |
| A. | 1001c |
| B. | 10011 |
| C. | 11011 |
| D. | 10001 |
| Answer» E. | |
| 39. |
What is the output of this program? class isNaN_output { public static void main(String args[]) { Double d = new Double(1 / 0.); boolean x = d.isNaN(); System.out.print(x); } } |
| A. | 0 |
| B. | 1 |
| C. | True |
| D. | False |
| Answer» E. | |
| 40. |
What is the output of this program? class isinfinite_output { public static void main(String args[]) { Double d = new Double(1 / 0.); boolean x = d.isInfinite(); System.out.print(x); } } |
| A. | 0 |
| B. | 1 |
| C. | True |
| D. | False |
| Answer» D. False | |
| 41. |
Which of the following package stores all the simple data types in java? |
| A. | lang |
| B. | java |
| C. | util |
| D. | java.packages |
| Answer» B. java | |
| 42. |
Which of these methods is used to check for infinitely large and small values? |
| A. | isInfinite() |
| B. | isNaN() |
| C. | Isinfinite() |
| D. | IsNaN() |
| Answer» B. isNaN() | |
| 43. |
Which of the following is method of wrapper Float for converting the value of an object into byte? |
| A. | bytevalue() |
| B. | byte byteValue() |
| C. | Bytevalue() |
| D. | Byte Bytevalue(). |
| Answer» C. Bytevalue() | |
| 44. |
Which of these is wrapper for simple data type float? |
| A. | float |
| B. | double |
| C. | Float |
| D. | Double |
| Answer» D. Double | |
| 45. |
Which of these is a super class of wrappers Double & Integer? |
| A. | Long |
| B. | Digits |
| C. | Float |
| D. | Number |
| Answer» E. | |
| 46. |
Which of these is a process of converting a simple data type into a class? |
| A. | type wrapping |
| B. | type conversion |
| C. | type casting |
| D. | none of the Mentioned. |
| Answer» B. type conversion | |
| 47. |
Which of these classes is not included in java.lang? |
| A. | Byte |
| B. | Integer |
| C. | Array |
| D. | Class |
| Answer» D. Class | |
| 48. |
What is the output of this program? class output { public static void main(String args[]) { StringBuffer s1 = new StringBuffer("Hello"); s1.insert(1,"Java"); System.out.println(s1); } } |
| A. | hello |
| B. | Java |
| C. | Hello Java |
| D. | HelloJava |
| Answer» E. | |
| 49. |
What is the output of this program? class output { public static void main(String args[]) { StringBuffer s1 = new StringBuffer("Hello World"); s1.insert(6 , "Good "); System.out.println(s1); } } |
| A. | HelloGoodWorld |
| B. | HellGoodoWorld |
| C. | HellGood oWorld |
| D. | Hello Good World |
| Answer» E. | |
| 50. |
What is the output of this program? class output { public static void main(String args[]) { StringBuffer s1 = new StringBuffer("Hello"); s1.setCharAt(1,'x'); System.out.println(s1); } } |
| A. | xello |
| B. | xxxxx |
| C. | Hxllo |
| D. | Hexlo |
| Answer» D. Hexlo | |