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Top 20 Java Programming MCQ’s Questions and Answers

By Team Alpha | General knowledge | Jun 12, 2019

What is the range of short data type in Java?
1. -32768 to 32767
2. -128 to 127
3. -2147483648 to 2147483647
4. None of the mentioned Ans a.( -32768 to 32767)

Which of these literals can be contained in float data type variable?
1. +1.7e+308
2. -1.7e+308
3. -3.4e+050
4. -3.4e+038 Ans d.( -3.4e+038)

Which data type value is returned by all transcendental math functions?
1. double
2. int
3. long
4. float Ans a.( double)

Decrement operator, −−, decreases value of variable by what number?
1. 4
2. 2
3. 3
4. 1 Ans d.( 1)

Can 8 byte long data type be automatically type cast to 4 byte float data type?
1. True
2. False Ans a.(True)

Which of these is not a bitwise operator?
1. |=
2. <=
3. &
4. <&= Ans b.(<=)

Which operator is used to invert all the digits in binary representation of a number?
1. <<<
2. >>>
3. ~
4. ^ Ans c.(~)

Which right shift operator preserves the sign of the value?
1. >>
2. <<
3. >>=
4. <<= Ans a.(>>)

What is the output of relational operators?
1. Characters
2. Double
3. Boolean
4. Integer Ans c.( Boolean)

Is SimpleDateFormat thread safe?
1. True
2. False Ans b.(False)

How is Date stored in database?
1. sql.DateTime
2. util.DateTime
3. sql.Date
4. util.Date Ans c.( java.sql.Date)

What does LocalTime represent?
1. Time without Date
2. Date and Time
3. Date and Time with timezone
4. Date without time Ans a.( Time without Date)

How to get UTC time?
1. getUTC();
2. now();
3. getUTC();
4. getUTC(); Ans b.( Instant.now();)

toRadian() and toDegree() methods were added by which version of Java?
1. Java 1.5
2. Java 3.0
3. Java 2.0
4. Java 1.0 Ans c.(Java 2.0)

Which of these keywords are used to define an abstract class?
1. abstract class
2. Abstract
3. abstract
4. abst Ans c.( abstract)

Which of these is not abstract?
1. AbstractList
2. Thread
3. List
4. None of the Mentioned Ans b.(Thread)

Which of these packages contains abstract keyword?
1. system
2. io
3. util
4. lang Ans d.( java.lang)

Which of these keyword can be used in subclass to call the constructor of superclass?
1. extends
2. extent
3. this
4. super Ans d.( super)

Which of these keywords can be used to prevent Method overriding?
1. protected
2. constant
3. static
4. final Ans d.( final)

Which of these is supported by method overriding in Java?
1. Encapsulation
2. Abstraction
3. Polymorphism
4. None of the mentioned Ans c.( Polymorphism)

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