因項目測試須要，打印出對象的鍵值對，直接上代碼

 1 public String toString() { 2         Field[] fields = getClass().getFields(); 3         StringBuffer sb = new StringBuffer(); 4         sb.append(getClass().getName() + ":[/n"); 5         for (Field field : fields) { 6             sb.append("    "); 7             sb.append(field.getName() + " = "); 8             try { 9                 sb.append(field.get(this));10             } catch (IllegalArgumentException e) {11                 e.PRintStackTrace();12             } catch (IllegalaccessException e) {13                 e.printStackTrace();14             }15             sb.append("/n");16         }17         sb.append("]");18         return sb.toString();19     }

效果圖: