Java Lang Java by API

/*
 * Output:
   Length: 0
   Capacity:40
 * */
public class MainClass {
  public static void main(String args[]) {
    StringBuffer sb = new StringBuffer(40);
    System.out.println(sb);
    System.out.println("Length: "+sb.length());
    System.out.println("Capacity:"+sb.capacity());
  }
}