LongMath 类|番石榴| Java
LongMath 用于对 Long 值进行数学运算。基本的独立数学函数根据所涉及的主要数值类型分为类【IntMath】【long math】【double math】和类 。这些类具有并行结构,但每个都只支持相关的函数子集。
申报:申报为 的班级为:
@GwtCompatible(emulated = true)
public final class LongMath
extends Object
下表显示了番石榴 LongMath Class 提供的一些方法:
例外:
- log2:IllegalArgumentExceptionif x<= 0
- log10:IllegalArgumentExceptionif x<= 0
- pow:T2】IllegalArgumentExceptionif k<0
- sqrt : 非法参数异常 if x < 0
- 除: 算术异常如果 q == 0,或者如果 mode ==不必要且 a 不是 b 的整数倍
- 修改: 算术异常如果 m < = 0
- gcd:IllegalArgumentException如果 a < 0 或 b < 0
- 如果 a + b 在有符号长算术中溢出,则检查 dd : 算术异常
- 检查子管道: 算术异常如果 a–b 在有符号长算术中溢出
- 检查倍数: 算术异常如果 a * b 在有符号长算术中溢出
- 检查电流: 算术异常如果 b 到 k 次方在有符号长算术中溢出
- 阶乘:T2【IllegalargumentExceptionif n<0
- 二项式:IllegalArgumentExceptionif n<0,k < 0 或 k > n
番石榴 LongMath 类提供的其他一些方法有:
例 1 :
// Java code to show implementation of
// LongMath Class of Guava
import java.math.RoundingMode;
import com.google.common.math.LongMath;
class GFG {
// Driver code
public static void main(String args[])
{
// Creating an object of GFG class
GFG obj = new GFG();
// Function calling
obj.examples();
}
private void examples()
{
try {
// exception will be thrown as 80 is not
// completely divisible by 3
// thus rounding is required, and
// RoundingMode is set as UNNESSARY
System.out.println(LongMath.divide(80, 3, RoundingMode.UNNECESSARY));
}
catch (ArithmeticException ex) {
System.out.println("Error Message is : " + ex.getMessage());
}
}
}
输出:
Error Message is : mode was UNNECESSARY, but rounding was necessary
例 2 :
// Java code to show implementation of
// LongMath Class of Guava
import java.math.RoundingMode;
import com.google.common.math.LongMath;
class GFG {
// Driver code
public static void main(String args[])
{
// Creating an object of GFG class
GFG obj = new GFG();
// Function calling
obj.examples();
}
private void examples()
{
// As 120 is divisible by 4, so
// no exception is thrown
System.out.println(LongMath.divide(120, 4, RoundingMode.UNNECESSARY));
// To compute GCD of two integers
System.out.println("GCD is : " + LongMath.gcd(70, 14));
// To compute log to base 10
System.out.println("Log10 is : " + LongMath.log10(1000, RoundingMode.HALF_EVEN));
// To compute remainder
System.out.println("modulus is : " + LongMath.mod(125, 5));
// To compute factorial
System.out.println("factorial is : " + LongMath.factorial(7));
// To compute log to base 2
System.out.println("Log2 is : " + LongMath.log2(8, RoundingMode.HALF_EVEN));
// To compute square root
System.out.println("sqrt is : " + LongMath.sqrt(LongMath.pow(12, 2), RoundingMode.HALF_EVEN));
}
}
输出:
30
GCD is : 14
Log10 is : 3
modulus is : 0
factorial is : 5040
Log2 is : 3
sqrt is : 12
参考:T2】谷歌番石榴
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