Java 番石榴| IntMath.checkedAdd(int a,int b)方法带示例

原文:https://www . geesforgeks . org/Java-guava-int math-checkedaddint-a-int-b-method-with-examples/

checkedAdd(int a,int b) 是番石榴的 IntMath 类的一种方法,它接受两个参数 ab ,并返回它们的和。

语法:

public static int checkedAdd(int a, int b)

参数:该方法接受两个整数值 ab 并计算它们的和。

返回值:该方法返回传递给它的 int 值之和,前提是它不溢出。

异常:如果和(即,a–b)在有符号整数运算中溢出,方法 CheckEdad(int a,int b)将抛出 算法异常

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);
    }
}

Output:

Sum of 25 and 36 is: 61
Sum 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);
        }
    }
}

Output:

参考: https://Google . github . io/guava/releases/20.0/API/docs/com/Google/common/math/intmath . html # checkedAdd-int-int-