Example of StringBuilder by reverse() method in java.

class string26capacity
{
public static void main(String surat[])
{
StringBuilder sb=new StringBuilder();
System.out.println(sb.capacity()); //default 16

sb.append("Hello");
System.out.println(sb.capacity()); //now 16

sb.append("java is my favourite language");
System.out.println(sb.capacity());//now (16*2)+2=34 i.e (oldcapacity*2)+2
}
}

Output: