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发表于 2019-08-26 15:24:39 | 查看: 5133| 回复: 0

Guava IntMath类

Guava IntMath类

IntMath提供整型的实用方法。

类声明

以下是com.google.common.math.IntMath类的声明:

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

方法

Guava IntMath类_www.wityx.com

方法继承

这个类从以下类继承的方法:

java.lang.Object

IntMath 例子

选择使用任何编辑器创建以下java程序在 C:/> Guava GuavaTester.java

import java.math.RoundingMode;
import com.google.common.math.IntMath;

public class GuavaTester {

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

   private void testIntMath(){
      try{
         System.out.println(IntMath.checkedAdd(Integer.MAX_VALUE, Integer.MAX_VALUE));
      }catch(ArithmeticException e){
         System.out.println("Error: " + e.getMessage());
      }

      System.out.println(IntMath.divide(100, 5, 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(IntMath.divide(100, 3, RoundingMode.UNNECESSARY));
      }catch(ArithmeticException e){
         System.out.println("Error: " + e.getMessage());
      }

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

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

      System.out.println("sqrt(100): "+IntMath.sqrt(IntMath.pow(10,2), RoundingMode.HALF_EVEN));

      System.out.println("gcd(100,50): "+IntMath.gcd(100,50));

      System.out.println("modulus(100,50): "+IntMath.mod(100,50));

      System.out.println("factorial(5): "+IntMath.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

Error: overflow
20
Error: mode was UNNECESSARY, but rounding was necessary
Log2(2): 1
Log10(10): 1
sqrt(100): 10
gcd(100,50): 50
modulus(100,50): 0
factorial(5): 120


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