Method unchar

chapter21/src/main/java/com/seaofnodes/simple/SB.java:91–91

()

  //   sb.unchar().p(']');  // remove extra trailing comma
  //
  public SB unchar() { return unchar(1); }
  public SB unchar(int x) { _sb.setLength(_sb.length()-x); return this; }
  public SB setLen(int len) { _sb.setLength(len); return this; }
  public String subString(int start, int end ) { return _sb.substring(start,end); }