Guava – LongMath.mod方法与实例

Guava的LongMath类的mod(long x, long m)方法接受两个参数x和m，并用于计算x在m下的模数值。

语法:

public static long mod(long x, long m)

参数： 该方法接受两个参数x和m，它们都是长类型的，用来计算x对m的模数。

返回值： 该方法返回x对m的模数，它将是一个小于m的非负值。

异常: 如果m<=0，该方法mod(long x, long m)会抛出ArithmeticException。

以下例子说明了mod(long x, long m)方法。

例1 :

// Java code to show implementation of// mod(long x, long m) method of Guava's// LongMath classimport java.math.RoundingMode;import com.google.common.math.LongMath;  class GFG {      // Driver code    public static void main(String args[])    {        long x1 = -77;        long m1 = 4;          long ans1 = LongMath.mod(x1, m1);          // Using mod(long x, long m)        // method of Guava's LongMath class        System.out.println(x1 + " mod "                           + m1 + " is : " + ans1);          long x2 = 22;        long m2 = 6;          long ans2 = LongMath.mod(x2, m2);          // Using mod(long x, long m)        // method of Guava's LongMath class        System.out.println(x2 + " mod "                           + m2 + " is : " + ans2);    }}

输出:

-77 mod 4 is : 322 mod 6 is : 4

例2:

// Java code to show implementation of// mod(long x, long m) method of Guava's// LongMath classimport java.math.RoundingMode;import com.google.common.math.LongMath;  class GFG {      static long findMod(long x, long m)    {        try {            // Using mod(long x, long m)            // method of Guava's LongMath class            // This should throw "ArithmeticException"            // as m <= 0            long ans = LongMath.mod(x, m);              // Return the answer            return ans;        }        catch (Exception e) {            System.out.println(e);            return -1;        }    }      // Driver code    public static void main(String args[])    {        long x = 11;        long m = -5;          try {            // Function calling            findMod(x, m);        }        catch (Exception e) {            System.out.println(e);        }    }}

输出:

java.lang.ArithmeticException: Modulus must be positive

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