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javaconstructorstringbuilder

StringBuilder not being initialized to the length value given

I am trying to create a StringBuilder object with a given length, but every time I try to do so, the length of the StringBuilder object is printed as 0. Anyone know why?

String s = "i";
StringBuilder sb = new StringBuilder(s.length()+1);
System.out.println(sb.length());

In the above code, the length of the StringBuilder object should be 2 (1 from the length of "i" + 1), but when I print the StringBuilder's length in Eclipse, I get 0. I changed the length to 17 and 100, but I still got 0 as sb's length.

Solution

  • You're not setting its length in that constructor, you're setting its capacity. Its length is the number of chars actually in it and you haven't yet appended any characters to it.