Guava BigIntegerMath类

BigIntegerMath为BigInteger提供了实用方法。

类声明

以下是 com.google.common.math.BigIntegerMath 类的声明 –

@GwtCompatible(emulated = true)
public final class BigIntegerMath
   extends Object

方法

继承的方法

这个类继承了以下类的方法：

• java.lang.Object

BigIntegerMath类的示例

使用您选择的任何编辑器，在C:/> Guava中创建以下Java程序。

GuavaTester.java

import java.math.BigInteger;
import java.math.RoundingMode;

import com.google.common.math.BigIntegerMath;

public class GuavaTester {

   public static void main(String args[]) {
      GuavaTester tester = new GuavaTester();
      tester.testBigIntegerMath();
   }

   private void testBigIntegerMath() {
      System.out.println(BigIntegerMath.divide(BigInteger.TEN, new BigInteger("2"), RoundingMode.UNNECESSARY));
      try {

         //exception will be thrown as 100 is not completely divisible by 3 
         // thus rounding is required, and RoundingMode is set as UNNESSARY
         System.out.println(BigIntegerMath.divide(BigInteger.TEN, new BigInteger("3"), RoundingMode.UNNECESSARY));
      } catch(ArithmeticException e) {
         System.out.println("Error: " + e.getMessage());
      }

      System.out.println("Log2(2): " + BigIntegerMath.log2(new BigInteger("2"), RoundingMode.HALF_EVEN));

      System.out.println("Log10(10): " + BigIntegerMath.log10(BigInteger.TEN, RoundingMode.HALF_EVEN));

      System.out.println("sqrt(100): " + BigIntegerMath.sqrt(BigInteger.TEN.multiply(BigInteger.TEN), RoundingMode.HALF_EVEN));

      System.out.println("factorial(5): "+BigIntegerMath.factorial(5));
   }
}

验证结果

使用 javac 编译器编译该类，方法如下：

C:\Guava>javac GuavaTester.java

现在运行GuavaTester以查看结果。

C:\Guava>java GuavaTester

查看结果。

5
Error: Rounding necessary
Log2(2): 1
Log10(10): 1
sqrt(100): 10
factorial(5): 120