301.Which package does define String and StringBuffer classes?
Ans : java.lang package.
302. Which method can be used to obtain the length of the String?
Ans : length( ) method.
303. How do you concatenate Strings?
Ans : By using " + " operator.
304. Which method can be used to compare two strings for equality?
Ans : equals( ) method.
305. Which method can be used to perform a comparison between strings that ignores case differences?
Ans : equalsIgnoreCase( ) method.
306. What is the use of valueOf( ) method?
Ans : valueOf( ) method converts data from its internal format into a human-readable form.
307. What are the uses of toLowerCase( ) and toUpperCase( ) methods?
Ans : The method toLowerCase( ) converts all the characters in a string from uppercase to
lowercase.
The method toUpperCase( ) converts all the characters in a string from lowercase to
uppercase.
308. Which method can be used to find out the total allocated capacity of a StrinBuffer?
Ans : capacity( ) method.
309. Which method can be used to set the length of the buffer within a StringBuffer object?
Ans : setLength( ).
310. What is the difference between String and StringBuffer?
Ans : String objects are constants, whereas StringBuffer objects are not.
String class supports constant strings, whereas StringBuffer class supports growable, modifiable strings.
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