Java 番石榴| Longs.checkedSubtract(长 a，长 b)方法带示例
原文:https://www . geesforgeks . org/Java-guava-longs-checked subtractlong-a-long-b-method-with-examples/
checkedSubtract(long a，long b) 是番石榴 LongMath 类的一种方法，接受两个参数 a 和 b ，并返回它们的差值。
语法:
public static long checkedSubtract(long a, long b)
参数:该方法接受两个长值 a 和 b 并计算它们的差值。
返回值:该方法返回传递给它的长值之差，前提是不溢出。
异常:如果差(即，a–b)在有符号长算术中溢出，方法 checkedSubtract(长 a，长 b)将抛出 算术异常 。
下面的例子说明了上述方法的实现:
例 1:
// Java code to show implementation of
// checkedSubtract(long a, long b) method
// of Guava's LongMath class
import java.math.RoundingMode;
import com.google.common.math.LongMath;
class GFG {
// Driver code
public static void main(String args[])
{
long a1 = 25;
long b1 = 36;
// Using checkedSubtract(long a, long b)
// method of Guava's LongMath class
long ans1 = LongMath.checkedSubtract(a1, b1);
System.out.println("Difference of " + a1 + " and "
+ b1 + " is: " + ans1);
long a2 = 150;
long b2 = 667;
// Using checkedSubtract(long a, long b)
// method of Guava's LongMath class
long ans2 = LongMath.checkedSubtract(a2, b2);
System.out.println("Difference of " + a2 + " and "
+ b2 + " is: " + ans2);
}
}
输出:
Difference of 25 and 36 is: -11
Difference of 150 and 667 is: -517
例 2:
// Java code to show implementation of
// checkedSubtract(long a, long b) method
// of Guava's LongMath class
import java.math.RoundingMode;
import com.google.common.math.LongMath;
class GFG {
static long findDiff(long a, long b)
{
try {
// Using checkedSubtract(long a, long b) method
// of Guava's LongMath class
// This should throw "ArithmeticException"
// as the difference overflows in signed
// long arithmetic
long ans = LongMath.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[])
{
long a = Long.MIN_VALUE;
long b = 452;
try {
// Function calling
findDiff(a, b);
}
catch (Exception e) {
System.out.println(e);
}
}
}
输出:
java.lang.ArithmeticException: overflow
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