是的，这是一段微不足道的代码，但我仍然想知道是否有一个内置的替代品。
代码如下：

/**
 * Cast x to int, throw an exception if there's loss of information
 */
public static int safeLongToInt(long x)
{
  int result = (int) x;
  if (result != x)
    throw new RuntimeException("long doesn't fit in an int: " + x);

  return result;
}

c中的代码是：

int foo;
long bar = ...;
checked
{
  foo = bar;
}