Guava – IntMath.checkedAdd()方法及实例

checkedAdd(int a, int b)是Guava的IntMath类的一个方法，接受两个参数 a and b ，并返回它们的总和。

语法:

public static int checkedAdd(int a, int b)

参数: 该方法接受两个int值a和b并计算它们的总和。

返回值: 该方法返回传递给它的int值的总和，只要它不溢出。

异常情况: 方法checkedAdd(int a, int b)抛出了ArithmeticException，如果和，即(a – b)在有符号的int算术中溢出。

下面的例子说明了上述方法的实现。

例1:

// Java code to show implementation of// checkedAdd(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 checkedAdd(int a, int b)        // method of Guava's IntMath class        int ans1 = IntMath.checkedAdd(a1, b1);          System.out.println("Sum of " + a1 + " and "                           + b1 + " is: " + ans1);          int a2 = 150;        int b2 = 667;          // Using checkedAdd(int a, int b)        // method of Guava's IntMath class        int ans2 = IntMath.checkedAdd(a2, b2);          System.out.println("Sum of " + a2 + " and "                           + b2 + " is: " + ans2);    }}

输出:

Sum of 25 and 36 is: 61Sum of 150 and 667 is: 817

例2:

// Java code to show implementation of// checkedAdd(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 checkedAdd(int a, int b) method            // of Guava's IntMath class            // This should throw "ArithmeticException"            // as the sum overflows in signed            // int arithmetic            int ans = IntMath.checkedAdd(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:

参考资料 :

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