Java Mock Test
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This section presents you various set of Mock Tests related to Java Framework . You can download these sample mock tests at your local machine and solve offline at your convenience. Every mock test is supplied with a mock test key to let you verify the final score and grade yourself.
Java Mock Test I
Answer : C
Explaination
Correct syntax is public static void main(String[] args).
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Answer : B
Explaination
Boolean is a class and is not a keyword.
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Answer : A
Explaination
A class is a blue print from which individual objects are created. A class can contain fields and methods to describe the behavior of an object.
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Answer : A
Explaination
Primitive variables like int, float are stored on Stack.
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Answer : B
Explaination
Objects are allocated memory in heap memory space.
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Answer : A
Explaination
True, Static functions can be accessed via class name or via null reference.
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Answer : B
Explaination
True, Compile time error will occur if an int variable is compared with Boolean variable.
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Answer : D
Explaination
Local variables are not assigned any value by default.
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Answer : C
Explaination
Instance variables are assigned default values based on their types. For example, int variable is assigned 0 and an object type variable is assigned null as default value.
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Answer : A
Explaination
The byte data type is represented by an 8-bit signed two's complement integer.
Minimum value: -128
Maximum value: 127
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Answer : B
Explaination
The short data type is represented by 16-bit signed two's complement integer.
Minimum value: -32,768
Maximum value: 32,767
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Answer : C
Explaination
The int data type is represented by 32-bit signed two's complement integer,
Minimum value: -231
Maximum value: 231-1
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Answer : D
Explaination
The long data type is represented by 64-bit two's complement integer.
Minimum value: -263
Maximum value: 263-1
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Answer : C
Explaination
The float data type is represented by single-precision 32-bit IEEE 754 floating point.
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Answer : D
Explaination
The double data type is represented by double-precision 64-bit IEEE 754 floating point.
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Answer : B
Explaination
The char data type is represented by single 16-bit Unicode character.
Minimum value: '\u0000' (or 0)
Maximum value: '\uffff' (or 65,535)
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Answer : B
Explaination
The boolean data type can take either true or false, but its "size" isn't precisely defined.
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Answer : A
Explaination
True, an empty .java file is a valid source file.
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Answer : A
Explaination
True, a java file can contain one public class and many other non-public classes.
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Answer : B
Explaination
No, a java file can contain only one public class.
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Answer : A
Explianation
Byte variable has default value of 0 if defined as an instance/static variable.
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Answer : B
Explaination
Short variable has default value of 0 if defined as an instance/static variable.
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Answer : A
Explaination
Byte variable has default value of 0 if defined as an instance/static variable.
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Answer : B
Explaination
short variable has default value of 0 if defined as an instance/static variable.
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Answer : A
Explaination
int variable has default value of 0 if defined as an instance/static variable.
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