Que- Which of these methods is used to check for infinitely large and small values?
a. isInfinite()
b. isNaN()
c. Isinfinite()
d. IsNaN()
Answer- isInfinite()
Que- Which of the following package stores all the simple data types in java?
a. lang
b. java
c. util
d. java.packages
Answer- lang
Que- Which of these is a wrapper for data type int?
a. Integer
b. Long
c. Byte
d. Double
Answer- Integer
Que- 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- int hashCode()
Que- Which of these is a super class of wrappers Long, Character & Integer?
a. Long
b. Digits
c. Float
d. Number
Answer- Number
Que- Which of these is a wrapper for simple data type char?
a. Float
b. Character
c. String
d. Integer
Answer- Character
Que- 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- int intValue();
Que- 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- long longValue()
Que- Which of these class have only one field 'TYPE'?
a. Void
b. Process
c. System
d. Runtime
Answer- Void
Que- 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- void destroy()
Que- Standard output variable 'out' is defined in which class?
a. Void
b. Process
c. Runtime
d. System
Answer- System
Que- Which of these class can encapsulate an entire executing program?
a. Void
b. Process
c. Runtime
d. System
Answer- Process
Que- 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- currentTimeMillis()
Que- Which of these class holds a collection of static methods and variables?
a. Void
b. Process
c. Runtime
d. System
Answer- System
Que- Which of these class is a superclass of all other classes?
a. Math
b. Process
c. System
d. Object
Answer- Object
Que- 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- clone()
Que- 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- approximately 2.72
Que- Which of these method is a rounding function of Math class?
a. max()
b. min()
c. abs()
d. all of the mentioned
Answer- all of the mentioned
Que- Which of these class contains only floating point functions?
a. Math
b. Process
c. System
d. Object
Answer- Math
Que- Which of these class encapsulate the runtime state of an object or an interface?
a. Class
b. Object
c. Runtime
d. System
Answer- Class
Que- What is the value of "d" in the following Java code snippet? double d = Math.round ( 2.5 + Math.random() );
a.2
b.3
c.4
d.2.5
Answer-3
Que- Which of these exceptions is thrown by methods of System class?
a. IOException
b. SystemException
c. SecurityException
d. InputOutputException
Answer- SecurityException
Que- Which of these methods initiates garbage collection?
a. gc()
b. garbage()
c. garbagecollection()
d. Systemgarbagecollection()
Answer- gc()
Que- Which of these methods loads the specified dynamic library?
a. load()
b. library()
c. loadlib()
d. loadlibrary()
Answer- load()