Double类doubleToLongBits()方法 (Double class doubleToLongBits() method)

• doubleToLongBits() method is available in java.lang package.

  doubleToLongBits()方法在java.lang包中可用。

• doubleToLongBits() method follows IEEE 754 double floating-point standards and according to standards, it returns the bits that denote floating-point value.

  doubleToLongBits()方法遵循IEEE 754双浮点标准，并且根据这些标准，它返回表示浮点值的位。

• doubleToLongBits() method is a static method, it is accessible with the class name too and if we try to access the method with the class object then also we will not get an error.

  doubleToLongBits()方法是一个静态方法，也可以使用类名进行访问，如果我们尝试使用类对象访问该方法，那么也不会收到错误。

• doubleToLongBits() method does not throw an exception at the time of representing bits.

  doubleToLongBits()方法在表示位时不会引发异常。

Syntax:

句法：

    public static long doubleToLongBits(double value);

Parameter(s):

参数：

• double value – This parameter represents the double precision floating point value.

  double value –此参数表示双精度浮点值。

Return value:

返回值：

The return type of this method is long, it returns the bits that represent the double precision floating-point value.

此方法的返回类型为long ，它返回表示双精度浮点值的位。

Note:

注意：

• If we pass positive infinity, it returns the value 0x7ff0000000000000L.

  如果我们传递正无穷大 ，它将返回值0x7ff0000000000000L 。

• If we pass negative infinity, it returns the value 0xfff0000000000000L.

  如果我们传递负无穷大 ，它将返回值0xfff0000000000000L 。

• If we pass NaN, it returns the value 0x7ff8000000000000L.

  如果我们通过NaN ，它将返回值0x7ff8000000000000L 。

Example:

例：

// Java program to demonstrate the example 
// of doubleToLongBits(double value)
// method of Double class
public class DoubleToLongBitsOfDoubleClass {
public static void main(String[] args) {
// Variables initialization
double value1 = 18.20;
double value2 = 19.20;
// Display value1,value2 values
System.out.println("value1: " + value1);
System.out.println("value2: " + value2);
// It returns the bits denoted by the double 
// floating-point argument by calling 
// Double.doubleToLongBits(value1)
long result1 = Double.doubleToLongBits(value1);
// It returns the bits denoted by the double 
// floating-point argument by calling 
// Double.doubleToLongBits(value2)
long result2 = Double.doubleToLongBits(value2);
// Display result1,result2 values
System.out.println("Double.doubleToLongBits(value1): " + result1);
System.out.println("Double.doubleToLongBits(value2): " + result2);
}
}

Output

输出量

value1: 18.2
value2: 19.2
Double.doubleToLongBits(value1): 4625816062258262835
Double.doubleToLongBits(value2): 4626097537234973491

翻译自: https://www.includehelp.com/java/double-class-doubletolongbits-method-with-example.aspx