Guava-1.17.1类Objects.ToStringHelper

public ToStringHelper add(String name, double value)

public ToStringHelper addValue(@NullableDecl Object value)

public String toString()

@Override
    public String toString() {
      // create a copy to keep it consistent in case value changes
      boolean omitNullValuesSnapshot = omitNullValues;
      String nextSeparator = "";
      StringBuilder builder = new StringBuilder(32).append(className).append('{');
      for (ValueHolder valueHolder = holderHead.next;
          valueHolder != null;
          valueHolder = valueHolder.next) {
        Object value = valueHolder.value;
        if (!omitNullValuesSnapshot || value != null) {
          builder.append(nextSeparator);
          nextSeparator = ", ";

          if (valueHolder.name != null) {
            builder.append(valueHolder.name).append('=');
          }
          if (value != null && value.getClass().isArray()) {
            Object[] objectArray = {value};
            String arrayString = Arrays.deepToString(objectArray);
            builder.append(arrayString, 1, arrayString.length() - 1);
          } else {
            builder.append(value);
          }
        }
      }
      return builder.append('}').toString();
    }