Java IntMath.checkedMultiply(int a, int b)用法及代碼示例

CheckedMultiply(int a，int b)是Guava IntMath類的方法，該方法接受兩個參數a和b並返回其乘積。

用法:

public static int checkedMultiply(int a, int b)

參數：該方法接受兩個int值a和b並計算它們的乘積。

返回值：該方法返回傳遞給它的int值的乘積，前提是它不會溢出。

異常：如果乘積(a-b)在有符號的int算術中溢出，則checkedMultiply(int a，int b)的方法將引發ArithmeticException。

以下示例說明了上述方法的實現：

範例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); 
    } 
}

輸出：

Product of 25 and 36 is:900
Product of 150 and 667 is:100050

範例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); 
        } 
    } 
}

輸出：

java.lang.ArithmeticException:overflow

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

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