StringBuffer no-arg constructor

How do I assign a value to a stringBuffer object if I am using default constructor?

The following code does not compile:

Code:

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public class StringBufferDemo {
        public static void main(String args[])
        {
                StringBuffer sb1=new StringBuffer();
                sb1="1234567890";
        }
}

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PS: I know we can use the constructor StringBuffer(String str), but what is the use of the no-arg constructor if we can assign values only by using StringBuffer(str)?

I have never needed to do this so I don't know. But I just looked at the API and what I do know is how I could approach it and even test it. Did you read the API and look at the methods? Do you see anything that might provide an answer? If I have to read the API to help answer some of these questions then I expect you and others to make an attempt also.

Regards,
Jim

a StringBuffer is not a String, so why are you trying to assign a String to a StringBuffer?

There are four constructors for StringBuffer:

StringBuffer( )
StringBuffer(int size)
StringBuffer(String str)
StringBuffer(CharSequence chars)

If I want to use the first version of the overloaded constructor, how to assign a value? You will be ultimately be using 3rd or 4th version of the constructor to assign the value, so what is the use of no-arg constructor?

Suhaas, you need to get your terminology straight before continuing to post 'questions' here. The line

Code:

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StringBuffer sb = new StringBuffer();

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declares a variable sb of type StringBuffer and assigns a value to it, a reference to a newly created StringBuffer.

What you are referring to as 'a value' is anybody's guess.

db

Ok, lets use the line:

StringBuffer sb = new StringBuffer();

Now suppose I want to assign "abc" to it. How do I go about it?

You're still not reading the API documentation. Do you want to be stuck forever? When are you actually going to LISTEN to the advice you ask for?

Quote:

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Originally Posted by suhaas.mohandos@gmail.com

Ok, lets use the line:

StringBuffer sb = new StringBuffer();

Now suppose I want to assign "abc" to it. How do I go about it?

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There isn't any way you can assign a String literal to a StringBuffer variable in Java.

Maybe you'd be happier with a language that isn't type safe.

db