Stringbuilder to string conversion in java

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I know we can convert a string builder to string using toString() and new String(stringbuilder) functions and constructor.. But I want to know the reason why this statement raises an error as "StringBuilder cannot be converted to String"

Java

String s = (String) StringBuilder;

What I have tried:

Convert stringbuilder to string using string literal

Posted 14-Feb-18 0:56am

Akshit Gupta

Updated 14-Feb-18 1:07am

v3

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3 solutions

Solution 1

Because a StringBuilder is a different class, and cannot be directly used as a String. You must use the toString() method, as described in the documentation.

Posted 14-Feb-18 1:01am

Richard MacCutchan

Updated 14-Feb-18 1:04am

v2

Solution 3

Well, I guess in case of type casting you'll have to take check for the "IS-A" test which would fail in this case as StringBuilder is NOT a String. In case of conversion you explicitly have to use the "toString()"(note that 't' isn't capital).

Posted 14-Feb-18 1:07am

vishaljamdagni

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phil.o · Accepted Answer · 2018-02-14T01:07:00

There is no such thing as a StringBuilder to String conversion.
StringBuilder class provides you with a toString method which allows you to get the string which is actually stored in the internal buffer of the StringBuilder object.
You have to use

Java

String s = sb.ToString();

, sb being a variable of the StringBuilder class.

Java

// Bad code!
String s = (String)StringBuilder;

is not correct on at least two levels:

You cannot cast a StringBuilder variable to a string directly.
StringBuilder is a class, not a variable. You cannot cast a class to anything, you only cast variables.

Stringbuilder to string conversion in java

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