String in Java

There is a companion class to string called ………………….., whose objects contain strings that can be modified after they are created.

• stringBuffer

• stringClass

• toString( )

• stringChar

Consider the following code,

string s=new String(); will create an instance of string with

• at least one character

• a default character

• no characters in it

• number of characters in it

…………………. returns a sting that contains the human-readable equivalent of the value with which it is called.

• toValue()

• value()

• valueOf()

• getValue()

…………………… method simply return a string that appropriately describes an object of your class.

• getChars()

• toString()

• toCharArray()

• getString()

To extract a single character from a sting, you can refer directly to an individual character via the …………………… method.

• charAt()

• getChars()

• getCharAt()

• getAt()

If you need to extract more than one character at a time, you can use the …………………………. .

• getBytes()

• charAt()

• getChars()

• getString()

If S1 and S2 are two strings, which of the following statements or expressions are correct.

i) String S3=S1+S2;

ii) String S3=S1-S2;

iii) S1<=S2;

iv) S1.compareTo(S2);

• i and ii only

• ii and iii only

• ii and iv only

• i and iv only

For the following expression,

String S=new String(“abc”);

Which of the following calls are valid?

i) S.trim()

ii) S.replace(‘a’, ‘A’)

iii) S.Substring(3)

iv) S.toUpperCase()

• i and ii only

• i, ii and iii only

• ii, iii and iv only

• All i, ii, iii and iv

What will be the output of the following code?

String S=new String();

System.Out.Println (“S = ” +S);

• null

• error

• =S

• S=

…………………………….. is most useful when you are exporting a string value into an environment that does not support 16-bit unicode characters.

• getChars()

• getString()

• getValue()

• getBytes()