本文整理了Java中org.json.JSONObject.stringToNumber()方法的一些代码示例，展示了JSONObject.stringToNumber()的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。JSONObject.stringToNumber()方法的具体详情如下：
包路径：org.json.JSONObject
类名称：JSONObject
方法名：stringToNumber

JSONObject.stringToNumber介绍

[英]Converts a string to a number using the narrowest possible type. Possible returns for this function are BigDecimal, Double, BigInteger, Long, and Integer. When a Double is returned, it should always be a valid Double and not NaN or +-infinity.
[中]使用可能的最窄类型将字符串转换为数字。此函数的可能返回值为BigDecimal、Double、BigInteger、Long和Integer。返回Double时，它应该始终是有效的Double，而不是NaN或+-无穷大。

代码示例

代码示例来源：origin: loklak/loklak_server

/**
 * Get the Number value associated with a key.
 *
 * @param index
 *            The index must be between 0 and length() - 1.
 * @return The numeric value.
 * @throws JSONException
 *             if the key is not found or if the value is not a Number
 *             object and cannot be converted to a number.
 */
public Number getNumber(int index) throws JSONException {
  Object object = this.get(index);
  try {
    if (object instanceof Number) {
      return (Number)object;
    }
    return JSONObject.stringToNumber(object.toString());
  } catch (Exception e) {
    throw new JSONException("JSONArray[" + index + "] is not a number.", e);
  }
}

代码示例来源：origin: loklak/loklak_server

/**
 * Get an optional {@link Number} value associated with a key, or the default if there
 * is no such key or if the value is not a number. If the value is a string,
 * an attempt will be made to evaluate it as a number ({@link BigDecimal}). This method
 * would be used in cases where type coercion of the number value is unwanted.
 *
 * @param index
 *            The index must be between 0 and length() - 1.
 * @param defaultValue
 *            The default.
 * @return An object which is the value.
 */
public Number optNumber(int index, Number defaultValue) {
  Object val = this.opt(index);
  if (JSONObject.NULL.equals(val)) {
    return defaultValue;
  }
  if (val instanceof Number){
    return (Number) val;
  }
  
  if (val instanceof String) {
    try {
      return JSONObject.stringToNumber((String) val);
    } catch (Exception e) {
      return defaultValue;
    }
  }
  return defaultValue;
}

代码示例来源：origin: loklak/loklak_server

return stringToNumber((String) val);
} catch (Exception e) {
  return defaultValue;

代码示例来源：origin: loklak/loklak_server

/**
 * Get the Number value associated with a key.
 *
 * @param key
 *            A key string.
 * @return The numeric value.
 * @throws JSONException
 *             if the key is not found or if the value is not a Number
 *             object and cannot be converted to a number.
 */
public Number getNumber(String key) throws JSONException {
  Object object = this.get(key);
  try {
    if (object instanceof Number) {
      return (Number)object;
    }
    return stringToNumber(object.toString());
  } catch (Exception e) {
    throw new JSONException("JSONObject[" + quote(key)
        + "] is not a number.", e);
  }
}

代码示例来源：origin: b3log/latke

/**
 * Get the Number value associated with a key.
 *
 * @param index
 *            The index must be between 0 and length() - 1.
 * @return The numeric value.
 * @throws JSONException
 *             if the key is not found or if the value is not a Number
 *             object and cannot be converted to a number.
 */
public Number getNumber(int index) throws JSONException {
  Object object = this.get(index);
  try {
    if (object instanceof Number) {
      return (Number)object;
    }
    return JSONObject.stringToNumber(object.toString());
  } catch (Exception e) {
    throw new JSONException("JSONArray[" + index + "] is not a number.", e);
  }
}

代码示例来源：origin: b3log/latke

/**
 * Get an optional {@link Number} value associated with a key, or the default if there
 * is no such key or if the value is not a number. If the value is a string,
 * an attempt will be made to evaluate it as a number. This method
 * would be used in cases where type coercion of the number value is unwanted.
 *
 * @param key
 *            A key string.
 * @param defaultValue
 *            The default.
 * @return An object which is the value.
 */
public Number optNumber(String key, Number defaultValue) {
  Object val = this.opt(key);
  if (NULL.equals(val)) {
    return defaultValue;
  }
  if (val instanceof Number){
    return (Number) val;
  }
  
  try {
    return stringToNumber(val.toString());
  } catch (Exception e) {
    return defaultValue;
  }
}

代码示例来源：origin: b3log/latke

/**
 * Get an optional {@link Number} value associated with a key, or the default if there
 * is no such key or if the value is not a number. If the value is a string,
 * an attempt will be made to evaluate it as a number ({@link BigDecimal}). This method
 * would be used in cases where type coercion of the number value is unwanted.
 *
 * @param index
 *            The index must be between 0 and length() - 1.
 * @param defaultValue
 *            The default.
 * @return An object which is the value.
 */
public Number optNumber(int index, Number defaultValue) {
  Object val = this.opt(index);
  if (JSONObject.NULL.equals(val)) {
    return defaultValue;
  }
  if (val instanceof Number){
    return (Number) val;
  }
  
  if (val instanceof String) {
    try {
      return JSONObject.stringToNumber((String) val);
    } catch (Exception e) {
      return defaultValue;
    }
  }
  return defaultValue;
}

代码示例来源：origin: b3log/latke

/**
 * Get the Number value associated with a key.
 *
 * @param key
 *            A key string.
 * @return The numeric value.
 * @throws JSONException
 *             if the key is not found or if the value is not a Number
 *             object and cannot be converted to a number.
 */
public Number getNumber(String key) throws JSONException {
  Object object = this.get(key);
  try {
    if (object instanceof Number) {
      return (Number)object;
    }
    return stringToNumber(object.toString());
  } catch (Exception e) {
    throw new JSONException("JSONObject[" + quote(key)
        + "] is not a number.", e);
  }
}

代码示例来源：origin: org.b3log/latke

/**
 * Get the Number value associated with a key.
 *
 * @param index
 *            The index must be between 0 and length() - 1.
 * @return The numeric value.
 * @throws JSONException
 *             if the key is not found or if the value is not a Number
 *             object and cannot be converted to a number.
 */
public Number getNumber(int index) throws JSONException {
  Object object = this.get(index);
  try {
    if (object instanceof Number) {
      return (Number)object;
    }
    return JSONObject.stringToNumber(object.toString());
  } catch (Exception e) {
    throw new JSONException("JSONArray[" + index + "] is not a number.", e);
  }
}

代码示例来源：origin: org.b3log/latke

/**
 * Get an optional {@link Number} value associated with a key, or the default if there
 * is no such key or if the value is not a number. If the value is a string,
 * an attempt will be made to evaluate it as a number. This method
 * would be used in cases where type coercion of the number value is unwanted.
 *
 * @param key
 *            A key string.
 * @param defaultValue
 *            The default.
 * @return An object which is the value.
 */
public Number optNumber(String key, Number defaultValue) {
  Object val = this.opt(key);
  if (NULL.equals(val)) {
    return defaultValue;
  }
  if (val instanceof Number){
    return (Number) val;
  }
  
  try {
    return stringToNumber(val.toString());
  } catch (Exception e) {
    return defaultValue;
  }
}

代码示例来源：origin: org.b3log/latke

/**
 * Get an optional {@link Number} value associated with a key, or the default if there
 * is no such key or if the value is not a number. If the value is a string,
 * an attempt will be made to evaluate it as a number ({@link BigDecimal}). This method
 * would be used in cases where type coercion of the number value is unwanted.
 *
 * @param index
 *            The index must be between 0 and length() - 1.
 * @param defaultValue
 *            The default.
 * @return An object which is the value.
 */
public Number optNumber(int index, Number defaultValue) {
  Object val = this.opt(index);
  if (JSONObject.NULL.equals(val)) {
    return defaultValue;
  }
  if (val instanceof Number){
    return (Number) val;
  }
  
  if (val instanceof String) {
    try {
      return JSONObject.stringToNumber((String) val);
    } catch (Exception e) {
      return defaultValue;
    }
  }
  return defaultValue;
}

代码示例来源：origin: org.b3log/latke

/**
 * Get the Number value associated with a key.
 *
 * @param key
 *            A key string.
 * @return The numeric value.
 * @throws JSONException
 *             if the key is not found or if the value is not a Number
 *             object and cannot be converted to a number.
 */
public Number getNumber(String key) throws JSONException {
  Object object = this.get(key);
  try {
    if (object instanceof Number) {
      return (Number)object;
    }
    return stringToNumber(object.toString());
  } catch (Exception e) {
    throw new JSONException("JSONObject[" + quote(key)
        + "] is not a number.", e);
  }
}