Java/Java Mcq Question Set 9 Sample Test,Sample questions

Question:
�Standard output variable �out� is defined in which class?

1.Process

2.Void

3.System

4.Runtime


Question:
Output : package pkg; class output { public static void main(String args[]) { StringBuffer s1 = new StringBuffer("Hello"); s1.setCharAt(1, x); System.out.println(s1); } }

1.Hexlo

2.xxxxx

3.xello

4.Hxllo


Question:
What is the string contained in s after following lines of code? StringBuffer s new StringBuffer(Hello); s.deleteCharAt(0);

1.ello

2.llo

3.Hell

4.Hel


Question:
What is the value returned by function compareTo() if the invoking string is less than the string compared?

1.value less than zero

2.value greater than zero

3.zero

4.None


Question:
What is the value returned by unction compareTo() if the invoking string is less than the string compared?

1.value less than zero

2.value greater than zero

3.zero

4.None


Question:
What will s2 contain after following lines of code? String s1 = one; String s2 = s1.concat(two)

1.one

2.two

3.twoone

4.onetwo


Question:
What will s2 contain after following lines of code? StringBuffer s1 = one; StringBuffer s2 = s1.append(two)

1.one

2.two

3.twoone

4.onetwo


Question:
Which of the following are incorrect form of StringBuffer class constructor?

1.StringBuffer(int size)

2.StringBuffer()

3.StringBuffer(int size , String str)

4.StringBuffer(String str)


Question:
Which of the following is correct way of importing an entire package pkg?

1.Import pkg.

2.Import pkg.*

3.import pkg.

4.import pkg.*


Question:
Which of the following is incorrect statement about packages?

1.A package can be renamed without renaming the directory in which the classes are stored.

2.Package defines a namespace in which classes are stored.

3.Java uses file system directories to store packages.

4.A package can contain other package within it.


Question:
Which of the following is method of System class is used to find how long a program takes to execute?

1.currenttimeMillis()

2.currentTimeMillis()

3.currenttime()

4.currentTime()


Question:
Which of the following is method of wrapper Float for converting the value of an object into byte?

1.byte bytevalue()

2.Bytevalue()

3.Byte Bytevalue()

4.bytevalue()


Question:
Which of the following is method of wrapper Integer for converting the value of an object into byte?

1.bytevalue()

2.Byte Bytevalue()

3.Bytevalue()

4.byte bytevalue()


Question:
Which of the following method of Process class can terminate a process?

1.void destroy()

2.void terminate()

3.void kill()

4.void exit()


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

1.Integer hashcode()

2.int hashCode()

3.int hashcode()

4.int hash()


Question:
Which of the following package stores all the simple data types in java?

1.java.packages

2.util

3.lang

4.java


Question:
Which of the following statement is correct?

1.replace() method replaces all the characters in invoking string with another character.

2.replace() replace() method replaces last occurrence of a character in invoking string with another character.

3.replace() method replaces only first occurances of a character in invoking string with another character.

4.replace() method replaces all occurrences of one character in invoking string with another character.


Question:
Which of the following statement is correct?

1.reverseall() method reverses all characters.

2.reverse() method reverses all characters.

3.replace() method replaces last occurrence of a character in invoking string with another character

4.replace() method replaces first occurrence of a character in invoking string with another character.


Question:
Which of these access specifiers can be used for a class so that it's members can be accessed by a different class in the different package?

1.Public

2.Private

3.Protected

4.None


Question:
Which of these class can encapsulate an entire executing program?

1.Process

2.Runtime

3.System

4.Void


Question:
Which of these class can generate an array which can increase and decrease in size automatically?

1.DynamicsList()

2.DynamicList()

3.ArrayList()

4.LinkedList()


Question:
Which of these class have only one field �TYPE�?

1.Process

2.Void

3.Runtime

4.System


Question:
Which of these class holds a collection of static methods and variables?

1.System

2.Void

3.Runtime

4.Process


Question:
Which of these class is superclass of String and StringBuffer class?

1.ArrayList

2.java.lang

3.java.util

4.None


Question:
Which of these class is used to create an object whose character sequence is mutable?

1.StringBuffer()

2.String()

3.Both of the mentioned

4.None


Question:
Which of these constructors is used to create an empty String object?

1.String()

2.String(void)

3.String(0)

4.None


Question:
Which of these data type value is returned by equals() method of String class?

1.boolean

2.char

3.int

4.All of the above


Question:
Which of these is a mechanism for naming and visibility control of a class and its content?

1.Object

2.Interface

3.Packages

4.None


Question:
Which of these is a super class of wrappers Long, Character & Integer?

1.Number

2.Long

3.Float

4.Digits


Question:
Which of these is a wrapper for data type int?

1.Byte

2.Long

3.Both a & b

4.Integer


Question:
Which of these is an an correct statement?

1.StringBuffer class is used to store string in a buffer for later use.

2.String object can point to some other reference of String variable.

3.String objects are immutable, they cannot be changed.

4.None


Question:
Which of these is wrapper for simple data type char?

1.Character

2.Float

3.String

4.Both a & c


Question:
Which of these is wrapper for simple data type float?

1.Double

2.double

3.float

4.Float


Question:
Which of these keywords is used to define packages in Java?

1.Pkg

2.Package

3.package

4.pkg


Question:
Which of these method can be used to increase the capacity of ArrayList object manually?

1.ensureCapacity()

2.increasecapacity()

3.increaseCapacity()

4.Capacity()


Question:
Which of these method of ArrayList class is used to obtain present size of an object?

1.index()

2.size()

3.capacity()

4.length()


Question:
Which of these method of class String is used to check weather a given object starts with a particular string literal?

1.Starts()

2.ends()

3.endsWith()

4.startsWith()


Question:
Which of these method of class String is used to compare two String objects for their equality?

1.Equals()

2.equals()

3.Isequal()

4.isequal()


Question:
Which of these method of class String is used to extract a single character from a String object?

1.charat()

2.charAt()

3.ChatAt()

4.CHARAT()


Question:
Which of these method of class String is used to obtain length of String object?

1.lengthof()

2.Sizeof()

3.get()

4.length()


Question:
Which of these method of class String is used to remove leading and trailing whitespaces?

1.startsWith()

2.Trim()

3.trim()

4.doTrim()


Question:
Which of these method of class StringBuffer is used to concatenate the string representation to the end of invoking string?

1.join()

2.append()

3.concat()

4.concatenate()


Question:
Which of these method of class StringBuffer is used to extract a substring from a String object

1.SubString()

2.substring()

3.Substring()

4.None


Question:
Which of these method of class StringBuffer is used to find the length of current character sequence?

1.capacity()

2.Capacity()

3.Length()

4.length()


Question:
Which of these methods can be used to obtain a static array from an ArrayList object?

1.Array()

2.toArray()

3.covertArray()

4.covertoArray()


Question:
Which of these methods is used to check for infinitely large and small values?

1.Isinfinite()

2.isInfinite()

3.IsNaN()

4.isNaN()


Question:
Which of these methods is used to compare a specific region inside a string with another specific region in another string?

1.regionMatches()

2.RegionMatches()

3.regionMatch()

4.match()


Question:
Which of these methods is used to obtain value of invoking object as a long?

1.Long longvalue()

2.long longValue()

3.Long Longvalue()

4.long value()


Question:
Which of these operators can be used to concatenate two or more String objects?

1.+

2.&

3.||

4.+=


Question:
Which of this access specifies can be used for a class so that its members can be accessed by a different class in the same package?

1.Protected

2.No Modifier

3.Public

4.All of the above


More MCQS

  1. Java Mcq Question Set 1
  2. Java Mcq Question Set 2
  3. Java Mcq Question Set 3
  4. Java Mcq Question Set 4
  5. Java Mcq Question Set 5
  6. Java Mcq Question Set 6
  7. Java Mcq Question Set 7
  8. Java Mcq Question Set 8
  9. Java Mcq Question Set 9
  10. Java Multiple Choice Questions
  11. DATA TYPES IN JAVA
  12. Classes ,Constructor ,Methods,Inheritance
  13. Java Multiple Choice Questions.
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