Guava教程
BigIntegerMath提供BigInteger的实用方法。
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方法:java.lang.Object
使用所选择的任何编辑器创建下面的java程序 C:/> Guava
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编译器编译如下类
C:\Guava>javac GuavaTester.java
现在运行GuavaTester看到的结果
C:\Guava>java GuavaTester
看到结果
5
Error: Rounding necessary
Log2(2): 1
Log10(10): 1
sqrt(100): 10
factorial(5): 120
转载自并发编程网-ifeve.com