What is the use of StringBuilder in java?

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Is it mandatory to use StringBuilder for string concatenation in java? Is it so?

Jun 19, 2018 in Java by scarlett
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If you use String concatenation in a loop, like

String str = "";
for (int i = 0; i < 50; i++)
{
    str += ", " + i;
}

then StringBuilder is used (not StringBuffer) instead of a String because it is much faster and consumes less memory.

If you have a single statement,

String str = "1, " + "2, " + "3, " + "4," + "5, " ...;

then you can use Strings because the compiler will use StringBuilder automatically.

answered Jun 19, 2018 by Akrati
• 960 points

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