There is a prerequisite for forced type conversion or automatic upward modeling, that is, the modeling object must be converted type data.

For example, your Object[] args={ rowld}, where rowld is an int type, but all types in java inherit the Object type, so rowld can also be said to be an Object type, and assignment will not be reported incorrectly. args2[i]=args[i]。 toString()； Because the return type of the Object.toString () method is Stirng, the assignment will not give an error.

But it is obviously wrong to directly convert args into args2, just like Stringstr =1; Same, incompatible types. . .