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Java IntMath.checkedMultiply(int a, int b)用法及代码示例


CheckedMultiply(int a,int b)是Guava IntMath类的方法,该方法接受两个参数a和b并返回其乘积。

用法:

public static int checkedMultiply(int a, int b)

参数:该方法接受两个int值a和b并计算它们的乘积。


返回值:该方法返回传递给它的int值的乘积,前提是它不会溢出。

异常:如果乘积(a-b)在有符号的int算术中溢出,则checkedMultiply(int a,int b)的方法将引发ArithmeticException。

以下示例说明了上述方法的实现:

范例1:

// Java code to show implementation of 
// checkedMultiply(int a, int b) method 
// of Guava's IntMath class 
  
import java.math.RoundingMode; 
import com.google.common.math.IntMath; 
  
class GFG { 
  
    // Driver code 
    public static void main(String args[]) 
    { 
        int a1 = 25; 
        int b1 = 36; 
  
        // Using checkedMultiply(int a, int b) 
        // method of Guava's IntMath class 
        int ans1 = IntMath.checkedMultiply(a1, b1); 
  
        System.out.println("Product of " + a1 + " and "
                           + b1 + " is:" + ans1); 
  
        int a2 = 150; 
        int b2 = 667; 
  
        // Using checkedMultiply(int a, int b) 
        // method of Guava's IntMath class 
        int ans2 = IntMath.checkedMultiply(a2, b2); 
  
        System.out.println("Product of " + a2 + " and "
                           + b2 + " is:" + ans2); 
    } 
}
输出:
Product of 25 and 36 is:900
Product of 150 and 667 is:100050

范例2:

// Java code to show implementation of 
// checkedMultiply(int a, int b) method 
// of Guava's IntMath class 
  
import java.math.RoundingMode; 
import com.google.common.math.IntMath; 
  
class GFG { 
  
    static int findDiff(int a, int b) 
    { 
        try { 
  
            // Using checkedMultiply(int a, int b) method 
            // of Guava's IntMath class 
            // This should throw "ArithmeticException" 
            // as the product overflows in signed 
            // int arithmetic 
            int ans = IntMath.checkedMultiply(a, b); 
  
            // Return the answer 
            return ans; 
        } 
        catch (Exception e) { 
            System.out.println(e); 
            return -1; 
        } 
    } 
  
    // Driver code 
    public static void main(String args[]) 
    { 
        int a = Integer.MIN_VALUE; 
        int b = 452; 
  
        try { 
  
            // Function calling 
            findDiff(a, b); 
        } 
        catch (Exception e) { 
            System.out.println(e); 
        } 
    } 
}
输出:
java.lang.ArithmeticException:overflow

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



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注:本文由纯净天空筛选整理自Sahil_Bansall大神的英文原创作品 Java Guava | IntMath.checkedMultiply(int a, int b) method with Examples。非经特殊声明,原始代码版权归原作者所有,本译文未经允许或授权,请勿转载或复制。