Capacity and length

Return	Method	Summary
int	capacity()	Returns the current capacity.
int	length()	Returns the length (character count).
void	ensureCapacity(int minimumCapacity)	Ensures that the capacity is at least equal to the specified minimum.
void	setLength(int newLength)	Sets the length of the character sequence.
void	trimToSize()	Attempts to reduce storage used for the character sequence.


public class Main {
  public static void main(String[] argv) {
    StringBuilder sb = new StringBuilder();
    sb.append("java2s.com");

    System.out.println(sb.length());
    System.out.println(sb.capacity());

    
    sb.trimToSize();
    
    System.out.println(sb.length());
    System.out.println(sb.capacity());
    
  }
}

The output:

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