本文整理了Java中java.lang.Number.doubleValue()方法的一些代码示例，展示了Number.doubleValue()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。Number.doubleValue()方法的具体详情如下：
包路径：java.lang.Number
类名称：Number
方法名：doubleValue

Number.doubleValue介绍

[英]Returns this object's value as a double. Might involve rounding.
[中]以双精度形式返回此对象的值。可能需要四舍五入。

代码示例

代码示例来源：origin: apache/incubator-dubbo

@Override
  public Object decode(Object jv) {
    if (jv instanceof Number) {
      return ((Number) jv).doubleValue();
    }
    return (double) 0;
  }
};

代码示例来源：origin: apache/incubator-dubbo

@Override
  public Object decode(Object jv) {
    if (jv instanceof Number) {
      return ((Number) jv).doubleValue();
    }
    return (double) 0;
  }
};

代码示例来源：origin: apache/incubator-dubbo

@Override
  public Object decode(Object jv) throws IOException {
    if (jv instanceof Number) {
      return BigDecimal.valueOf(((Number) jv).doubleValue());
    }
    return (BigDecimal) null;
  }
};

代码示例来源：origin: apache/incubator-dubbo

/**
 * get double value.
 *
 * @param key key.
 * @param def default value.
 * @return value or default value.
 */
public double getDouble(String key, double def) {
  Object tmp = mMap.get(key);
  return tmp != null && tmp instanceof Number ? ((Number) tmp).doubleValue() : def;
}

代码示例来源：origin: apache/incubator-dubbo

/**
 * get double value.
 *
 * @param index index.
 * @param def   default value.
 * @return value or default value.
 */
public double getDouble(int index, double def) {
  Object tmp = mArray.get(index);
  return tmp != null && tmp instanceof Number ? ((Number) tmp).doubleValue() : def;
}

代码示例来源：origin: apache/incubator-dubbo

/**
 * get double value.
 *
 * @param key key.
 * @param def default value.
 * @return value or default value.
 */
public double getDouble(String key, double def) {
  Object tmp = mMap.get(key);
  return tmp != null && tmp instanceof Number ? ((Number) tmp).doubleValue() : def;
}

代码示例来源：origin: apache/incubator-dubbo

@Override
  public Object decode(Object jv) {
    if (jv instanceof Number) {
      return new Double(((Number) jv).doubleValue());
    }
    return (Double) null;
  }
};

代码示例来源：origin: apache/incubator-dubbo

/**
 * get double value.
 *
 * @param index index.
 * @param def   default value.
 * @return value or default value.
 */
public double getDouble(int index, double def) {
  Object tmp = mArray.get(index);
  return tmp != null && tmp instanceof Number ? ((Number) tmp).doubleValue() : def;
}

代码示例来源：origin: apache/incubator-dubbo

@Override
  public Object decode(Object jv) {
    if (jv instanceof Number) {
      return new Double(((Number) jv).doubleValue());
    }
    return (Double) null;
  }
};

代码示例来源：origin: apache/incubator-dubbo

@Override
  public Object decode(Object jv) throws IOException {
    if (jv instanceof Number) {
      return BigDecimal.valueOf(((Number) jv).doubleValue());
    }
    return (BigDecimal) null;
  }
};

代码示例来源：origin: google/guava

/**
 * Adds the given values to the dataset.
 *
 * @param values a series of values, which will be converted to {@code double} values (this may
 *     cause loss of precision)
 */
public void addAll(Iterator<? extends Number> values) {
 while (values.hasNext()) {
  add(values.next().doubleValue());
 }
}

代码示例来源：origin: google/guava

@Override
 public Double transformEntry(Number key, Number value) {
  return key.doubleValue() + value.doubleValue();
 }
};

代码示例来源：origin: google/guava

/**
 * Adds the given values to the dataset.
 *
 * @param values a series of values, which will be converted to {@code double} values (this may
 *     cause loss of precision)
 */
public void addAll(Iterable<? extends Number> values) {
 for (Number value : values) {
  add(value.doubleValue());
 }
}

代码示例来源：origin: apache/incubator-dubbo

@Override
  public void encode(Object obj, JSONWriter jb) throws IOException {
    jb.valueDouble(((Number) obj).doubleValue());
  }
};

代码示例来源：origin: apache/incubator-dubbo

@Override
  public void encode(Object obj, JSONWriter jb) throws IOException {
    jb.valueDouble(((Number) obj).doubleValue());
  }
};

代码示例来源：origin: stackoverflow.com

DecimalFormat df = new DecimalFormat("#.####");
df.setRoundingMode(RoundingMode.CEILING);
for (Number n : Arrays.asList(12, 123.12345, 0.23, 0.1, 2341234.212431324)) {
  Double d = n.doubleValue();
  System.out.println(df.format(d));
}

代码示例来源：origin: google/guava

@Override
public int compare(Number a, Number b) {
 return ((Double) a.doubleValue()).compareTo(b.doubleValue());
}

代码示例来源：origin: apache/incubator-dubbo

public double getParameter(String key, double defaultValue) {
  Number n = getNumbers().get(key);
  if (n != null) {
    return n.doubleValue();
  }
  String value = getParameter(key);
  if (StringUtils.isEmpty(value)) {
    return defaultValue;
  }
  double d = Double.parseDouble(value);
  getNumbers().put(key, d);
  return d;
}

代码示例来源：origin: apache/incubator-dubbo

public double getParameter(String key, double defaultValue) {
  Number n = getNumbers().get(key);
  if (n != null) {
    return n.doubleValue();
  }
  String value = getParameter(key);
  if (StringUtils.isEmpty(value)) {
    return defaultValue;
  }
  double d = Double.parseDouble(value);
  getNumbers().put(key, d);
  return d;
}

代码示例来源：origin: apache/incubator-dubbo

public double getMethodParameter(String method, String key, double defaultValue) {
  String methodKey = method + "." + key;
  Number n = getNumbers().get(methodKey);
  if (n != null) {
    return n.doubleValue();
  }
  String value = getMethodParameter(method, key);
  if (StringUtils.isEmpty(value)) {
    return defaultValue;
  }
  double d = Double.parseDouble(value);
  getNumbers().put(methodKey, d);
  return d;
}