Answer Posted / srikanth reddy

-->String objects are constants and immutable where as
StringBuffer objects are mutable
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-->in string class we can create object by two ways
1)using new operator --> string s = new String("Java");

2)without new operator --> String s2="raju";

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-->in string class there string constant pooling technique
but in stringbuffer there is no facility
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all the methods in stringbuufer class is synchorined so
thread safe but not in string class

FOR EXAMPLE WE R HAVING TWO LIST ELEMENTS ..BOTH LISTS CONTAINS ID,NAME,PLACE ..I NEED TO COMPARE BOTH IDS IN TWO LISTS,IF ID'S R SAME MEANS WE HAVE ADD THE DETAILS(LIKE NAME,PLACE) TO MAP...HOW IS POSSIBLE ?CAN ANY ONE SUGGEST?

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