Java中的 StrictMath rint() 方法

rint()是Java中 StrictMath 类的内置方法，用于获取与参数值最接近且等于整数的 double 值。它返回整数值，即使作为整数的两个双精度值同样接近给定参数的值。当参数值已经等于整数时，它返回与参数相同的值，当参数是 NaN 或无穷大或正零或负零时，它返回与参数相同的值。
句法：

public static double rint(double num)

参数：该方法接受要使用该方法转换的double类型的单个参数num 。
返回值：该方法返回等于整数的最接近的浮点值。
例子 ：

Input: num =72.2
Output: 72.0

下面的程序说明了 rint() 方法：
方案一：

java

// Java program to illustrate the
// java.lang.StrictMath.rint()
 
import java.lang.*;
 
public class Geeks {
    public static void main(String[] args)
    {
 
        // Get a double number
        double num1 = 87.1;
 
        // Convert the double number using rint() method
        double rint_Value = StrictMath.rint(num1);
 
        // Print the result
        System.out.println(" The Integer value closest to "
                         + num1 + " = " + rint_Value);
 
        // Get a double number
        double num2 = 65.9;
 
        // Convert the double number using rint() method
        rint_Value = StrictMath.rint(num1);
 
        // Print the result
        System.out.println(" The Integer value closest to "
                         + num1 + " = " + rint_Value);
    }
}

输出：

The Integer value closest to 87.1 = 87.0 
The Integer value closest to 87.1 = 87.0

方案二：

Java

// Java program to illustrate the
// java.lang.StrictMath.rint()
 
import java.lang.*;
 
public class Geeks {
 
    public static void main(String[] args)
    {
 
        // Get a double number
        double num1 = -65.5;
 
        // Convert the double number using rint() method
        double rint_Value = StrictMath.rint(num1);
 
        // Print the result
        System.out.println(" The Integer value closest to "
                         + num1 + " = " + rint_Value);
 
        // Get a double number
        double num2 = -42.7;
 
        // Convert the double number using rint() method
        rint_Value = StrictMath.rint(num1);
 
        // Print the result
        System.out.println(" The Integer value closest to "
                         + num1 + " = " + rint_Value);
    }
}

输出：

The Integer value closest to -65.5 = -66.0 
The Integer value closest to -65.5 = -66.0