Guava – IntMath.checkedSubtract()方法及实例

来源：这里教程网时间：2026-02-17 21:40:50 作者：

Guava – IntMath.checkedSubtract()方法及实例

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

语法:

public static int checkedSubtract(int a, int b)

参数: 该方法接受两个int值a和b，并计算它们的差异。

返回值: 该方法返回传递给它的int值的差值，只要它不溢出。

异常情况: CheckedSubtract(int a, int b)方法如果差值即(a – b)在有符号int算术中溢出，则抛出ArithmeticException。

下面的例子说明了上述方法的实现。

例1:

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

输出:

Difference of 25 and 36 is: -11Difference of 150 and 667 is: -517

例2:

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