Java Programming Multiple Choice Questions - Java Lang

This section focuses on the "Java Lang" in Java programming. These Multiple Choice Questions (MCQ) should be practiced to improve the Java programming skills required for various interviews (campus interviews, walk-in interviews, company interviews), placements and other competitive examinations.

1. Which of the following would compile without error?

A. int a = Math.abs(-5);
B. int b = Math.abs(5.0);
C. int d = Math.abs(5L);
D. int c = Math.abs(5.5F);

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2. Which of these classes encapsulate runtime state of an object?

A. Class
B. Runtime
C. System
D. Cache

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3. Which of these classes is not included in java.lang?

A. Class
B. Integer
C. Array
D. Byte

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4. Which of the following will produce an answer that is closest in value to a double, d, while not being greater than d?

A. (int)Math.abs(d);
B. (int)Math.max(d);
C. (int)Math.min(d);
D. (int)Math.floor(d);

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5. Which of these methods returns the class of an object?

A. getClass()
B. WhoseObject()
C. Class()
D. WhoseClass()

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6. Which of these class have only one field "TYPE"?

A. Void
B. Process
C. System
D. Runtime

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7. Which of the following method of Process class can terminate a process?

A. void kill()
B. void destroy()
C. void terminate()
D. void exit()

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8. Standard output variable "out" is defined in which class?

A. Void
B. Process
C. Runtime
D. System

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9. Which of these class can encapsulate an entire executing program?

A. Void
B. Process
C. Runtime
D. System

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10. 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()

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11. Which of these is a process of converting a simple data type into a class?

A. type casting
B. type conversion
C. type wrapping
D. None of the Mentioned

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12. 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()

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13. Which of these methods is used to check for infinitely large and small values?

A. isInfinite()
B. Isinfinite()
C. isNaN()
D. IsNaN()

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14. Which of the following methods is a method of wrapper Integer for obtaining hash code for the invoking object?

A. Integer hashcode()
B. int hashcode()
C. int hashCode()
D. int hash()

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15. Which of the following method of Process class can terminate a process??

A. void terminate()
B. void destroy()
C. void exit()
D. void kill()

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