Guava – LongMath.sqrt方法与实例

Guava – LongMath.sqrt方法与实例

Guava的LongMath类的sqrt(long x, RoundingMode mode)方法接受两个参数,根据第二个参数指定的舍入模式计算第一个参数的平方根。

语法:

public static long sqrt(long x, RoundingMode mode)

参数: 这个方法接受两个参数。

  • x:是一个长值,要找到它的平方根。
  • mode:是要进行舍入的舍入模式。

返回值: 该方法返回x的平方根,根据指定的四舍五入模式进行舍入。

异常情况: 此方法抛出以下参数。

  • IllegalArgumentException: 如果x < 0.
  • ArithmeticException: 如果模式是RoundingMode.UNNECESSARY并且sqrt(x)不是一个整数。

Enum RoundingMode

Enum 常数 描述
CEILING 向正无穷大舍入的舍入模式。
DOWN 向零舍入的舍入模式。
FLOOR 四舍五入到负无穷大的模式。
HALF_DOWN 向 “最近的邻居 “舍入的舍入模式,除非两个邻居的距离相等,在这种情况下向下舍入。
HALF_EVEN 向 “最近的邻居 “四舍五入的模式,除非两个邻居都是等距离,在这种情况下,向偶数邻居四舍五入。
HALF_UP 向 “最近的邻居 “四舍五入的模式,除非两个邻居都是等距离的,在这种情况下,向上舍入。
UNNECESSARY 四舍五入模式断言请求的操作有一个精确的结果,因此不需要四舍五入。
UP 四舍五入模式是指从零开始舍入。

下面给出了一些例子,以便更好地理解实现:

示例1:

// Java code to show implementation of
// sqrt(long x, RoundingMode mode) method
// of Guava's LongMath class
  
import java.math.RoundingMode;
import com.google.common.math.LongMath;
  
class GFG {
  
    // Driver code
    public static void main(String args[])
    {
        long x1 = 524;
  
        // Using sqrt(long x, RoundingMode mode)
        // method of Guava's LongMath class
        // The RoundingMode HALF_EVEN rounds towards
        // the nearest neighbor unless both neighbors
        // are equidistant, in which case, round towards
        // the even neighbor.
        long ans1
            = LongMath.sqrt(x1,
                            RoundingMode.HALF_EVEN);
  
        System.out.println("Square root of " + x1
                           + " is : " + ans1);
  
        long x2 = 316;
  
        // Using sqrt(long x, RoundingMode mode)
        // method of Guava's LongMath class
        // The RoundingMode FLOOR rounds towards
        // negative infinity.
        long ans2
            = LongMath.sqrt(x2,
                            RoundingMode.FLOOR);
  
        System.out.println("Square root of " + x2
                           + " is : " + ans2);
    }
}

输出:

Square root of 524 is : 23
Square root of 316 is : 17

示例2:

// Java code to show implementation of
// sqrt(long x, RoundingMode mode) method
// of Guava's LongMath class
  
import java.math.RoundingMode;
import com.google.common.math.LongMath;
  
class GFG {
  
    // Driver code
    public static void main(String args[])
    {
        int x = -65;
  
        try {
            // Using sqrt(long x, RoundingMode mode)
            // method of Guava's LongMath class
            // The RoundingMode HALF_EVEN rounds towards
            // the nearest neighbor unless both neighbors
            // are equidistant, in which case, round towards
            // the even neighbor.
  
            // This should throw "IllegalArgumentException"
            // as x < 0
            long ans1 = LongMath.sqrt(x,
                                      RoundingMode.HALF_EVEN);
        }
        catch (Exception e) {
            System.out.println(e);
        }
    }
}

输出:

java.lang.IllegalArgumentException: x (-65) must be >= 0

参考: https://google.github.io/guava/releases/20.0/api/docs/com/google/common/math/LongMath.html#sqrt-long-java.math.RoundingMode-

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