我们如何检查Java中是否发生下溢？
当给变量分配的值小于该变量的最小允许值时，就会发生下溢。如果Java中发生下溢，那么JVM 不会抛出任何异常，并且程序员有责任处理下溢情况。
示例
public class UnderlowTest {
public static void main(String[] args) {
int num1 = -2147483648;
int num2 = -1;
System.out.println("Number 1: " + num1);
System.out.println("Number 2: " + num2);
long sum = (long)num1 + (long)num2;
if(sum < Integer.MIN_VALUE) {
throw new ArithmeticException("发生下溢！");
}
System.out.println("The sum of two numbers : " + (int)sum);
}
}输出结果
Number 1: -2147483648
Number 2: -1
Exception in thread "main" java.lang.ArithmeticException: 发生下溢！
at UnderlowTest.main(UnderlowTest.java:9)