String, String Buffers And Its Functions
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- 1.The method toUpperCase and toLowerCase will return the same string if no case conversion was needed
- A.
True
- B.
False
- 2.String objects are immutable. what do you mean by that?
- A.
A. Object state can be replaced
- B.
B. Object state can’t be replaced
- C.
C. Object state can’t be modified
- D.
D. Object state can be modified
- 3.Which operators are overloaded for Strings?
- A.
=
- B.
++
- C.
+=
- D.
==
- 4.Which of the following statements are false?
- A.
Reverse() is available in String
- B.
The content of StringBuffer can be expanded beyond their initial buffer size
- C.
The standard java.lang.StringTokenizer class is a special type of Enumeration that represents segments of a string, which may be separated by one or more "delimiters"
- D.
StringBuffer is a final class
- E.
String objects are immutable
- 5.What will be the result if you compare StringBuffer with String if both have same values?
- A.
True
- B.
False
- C.
Error
- D.
None of these
- 6.Passing null to indexOf or lastIndexOf will throw
- A.
NullCharacterException
- B.
NullParameterException
- C.
NullPointerException
- D.
NumberFormatException
- 7.StringBuffer is faster when performing concatenation than String
- A.
True
- B.
False
- 8.
- A.
Ergic th
- B.
Ergic Thu
- C.
Ergic Th
- D.
ErgicThu
- 9.How many overloaded constructors ,other than the default constructor, does Stringbuffer have?
- A.
5
- B.
2
- C.
3
- D.
4
- 10.What is the output of this code? String s="Now is the time for all good men"+"to come to the aid of their country"; System.out.println(s.indexOf('t')); System.out.println(s.lastIndexOf('t',10)); System.out.println(s.indexOf("the"));
- A.
7,10,7
- B.
8,12,8
- C.
7,11,7
- D.
8,11,8
- 11.Number of constructors in string object in JAVA2 v5.0 ?
- A.
11
- B.
10
- C.
14
- D.
12
- 12.If two strings are same,the method public int compareTo returns
- A.
Null
- B.
Positive
- C.
Negative
- D.
Zero
- 13.A.hashCode() == b.hashCode() must also mean that a.equals(b)
- A.
True
- B.
False
- 14.Which of the following are used to manipulate the string buffer?
- A.
Append,trim,setCharAt,and replace
- B.
Append,insert,setCharAt,and reverse
- C.
Append,insert,getChars,and replace
- D.
Append,trim,getChars,and reverse
- 15.With respect to equals() , if x.equals(y) is true, then x.hashCode() == y.hashCode() is true. This is know as...............?
- A.
Consistent
- B.
Symmetric
- C.
Null
- D.
Reflexive
- E.
Transitive
- 16.What is the output of this code? String s=”First Program”; System.out.println(“[“ + s + “]”); s.trim( );
- A.
[ First Program ]
- B.
[First Program]
- C.
[FirstProgram]
- D.
First Program
- 17.Choose the correct option.
- A.
StringBuilder is synchronized, it offers faster performance than StringBuffer
- B.
StringBuilder is not synchronized, it offers faster performance than StringBuffer
- C.
StringBuilder is not synchronized, it offers slower performance than StringBuffer
- D.
StringBuilder is synchronized, it offers slower performance than StringBuffer
- 18.In one of the cases, we must apply StringBuffer rather than StringBuilder
- A.
Multitasking
- B.
Multithreading
- C.
Exception handling
- D.
String comparision
- 19.All operands are appended by calling toString method, if needed
- A.
True
- B.
False
- 20.If we override equals() , then we may or maynot override hashCode()
- A.
True
- B.
False
- 21.What is the use of ensureCapacity()?
- A.
Returns current number of capacity
- B.
The string buffer is allocated atmost ‘n’ places
- C.
The string buffer is allocated atleast ‘n’ places
- D.
The string buffer is allocated some ‘n+1’ places
- 22.What iis the output? { String name = "Petroleum"; System.out.println(name.equals("Petroleum")); System.out.println(name.equals("petroleum")); System.out.println(name.equalsIgnoreCase("petroleum")); }
- A.
True true true
- B.
True false false
- C.
True false true
- D.
False true true
- 23.StringBuffer ab=new StringBuffer(“smith”); System.out.println(“ab = “ + ab); char charArr[ ] = “Hi xy”.tocharArray( ); Ab.getChars(0,2,charArr,3); What is the output?
- A.
Hi smi
- B.
Hi sm
- C.
Smi
- D.
Ith
- 24.There is no relationship between String and StringBuffer.
- A.
True
- B.
False
- 25.The String class is final – its methods can’t be overloaded
- A.
True
- B.
False
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