This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
1.string is immutable where is string builder is mutable 2.In stringBuilder, automatically increase and decrease size of string object whenever add elements and delete elements .Where in string , it is fixed size . 3.StringBuilder can performe a insert(),Delete(),Reverse(),Sort() operations etc and we can create multiple instances .Where as String , It can't perfome . 4.StringBuilder takes enough memory for variable .Where as String can't perfome