// StringBufferTest.java - demo StringBuffer methods
public class StringBufferTest {
  public static void main(String[] args) {
    StringBuffer sbuf1 = new StringBuffer();
    StringBuffer sbuf2 = new StringBuffer("abcd");
    StringBuffer sbuf3 = new StringBuffer(30);
    System.out.println(sbuf1.length());
    System.out.println(sbuf2.length());
    System.out.println(sbuf3.length());
    System.out.println(sbuf1.capacity());
    System.out.println(sbuf2.capacity());
    System.out.println(sbuf3.capacity());
    System.out.println(sbuf2.charAt(1));
    sbuf2.setCharAt(2,'Z');
    System.out.println(sbuf2);
    sbuf2.append("xyz");
    System.out.println(sbuf2);
    sbuf2.append('?');
    sbuf2.insert(4, "---");
    sbuf2.insert(2, '+');
    System.out.println(sbuf2);
    sbuf2.reverse();
    System.out.println(sbuf2);
    System.out.println("sbuf2 capacity " +
                       sbuf2.capacity());
    System.out.println("sbuf2 length " +
                       sbuf2.length());
  }
}