�Standard output variable �out� is defined in which class?
1.Process
2.Void
3.System
4.Runtime
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
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
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
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
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
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
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)
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.*
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.
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()
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()
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()
Which of the following method of Process class can terminate a process?
1.void destroy()
2.void terminate()
3.void kill()
4.void exit()
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()
Which of the following package stores all the simple data types in java?
1.java.packages
2.util
3.lang
4.java
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.
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.
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
Which of these class can encapsulate an entire executing program?
1.Process
2.Runtime
3.System
4.Void
Which of these class can generate an array which can increase and decrease in size automatically?
1.DynamicsList()
2.DynamicList()
3.ArrayList()
4.LinkedList()
Which of these class have only one field �TYPE�?
1.Process
2.Void
3.Runtime
4.System
Which of these class holds a collection of static methods and variables?
1.System
2.Void
3.Runtime
4.Process
Which of these class is superclass of String and StringBuffer class?
1.ArrayList
2.java.lang
3.java.util
4.None
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
Which of these constructors is used to create an empty String object?
1.String()
2.String(void)
3.String(0)
4.None
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
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
Which of these is a super class of wrappers Long, Character & Integer?
1.Number
2.Long
3.Float
4.Digits
Which of these is a wrapper for data type int?
1.Byte
2.Long
3.Both a & b
4.Integer
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
Which of these is wrapper for simple data type char?
1.Character
2.Float
3.String
4.Both a & c
Which of these is wrapper for simple data type float?
1.Double
2.double
3.float
4.Float
Which of these keywords is used to define packages in Java?
1.Pkg
2.Package
3.package
4.pkg
Which of these method can be used to increase the capacity of ArrayList object manually?
1.ensureCapacity()
2.increasecapacity()
3.increaseCapacity()
4.Capacity()
Which of these method of ArrayList class is used to obtain present size of an object?
1.index()
2.size()
3.capacity()
4.length()
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()
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()
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()
Which of these method of class String is used to obtain length of String object?
1.lengthof()
2.Sizeof()
3.get()
4.length()
Which of these method of class String is used to remove leading and trailing whitespaces?
1.startsWith()
2.Trim()
3.trim()
4.doTrim()
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()
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
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()
Which of these methods can be used to obtain a static array from an ArrayList object?
1.Array()
2.toArray()
3.covertArray()
4.covertoArray()
Which of these methods is used to check for infinitely large and small values?
1.Isinfinite()
2.isInfinite()
3.IsNaN()
4.isNaN()
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()
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()
Which of these operators can be used to concatenate two or more String objects?
1.+
2.&
3.||
4.+=
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