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Tip of the Day
Language: Java Language
Expertise: Beginner
Dec 15, 1999



Application Security Testing: An Integral Part of DevOps

String to StringBuffer Conversion

How do I convert a String object to a StringBuffer object? I tried to put a String object into a stringBuffer using a cast, but I got an invalid cast error message.

String is an immutable class derived only from Object. Therefore you cannot cast it to another type. In C++ a copy constructor will be invoked, if available, when performing an assignment, but there is no equivalent behavior in Java.

To convert a String to a StringBuffer you must create a new StringBuffer instance with the String as an argument to the constructor. For example:

String str = "a string";
StringBuffer strbuf;

strbuf = new StringBuffer(str);
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