Making sure user inputs all input before thrwing exception

I am developing code in which i need user must enter all the inputs and compiler should throw exception after taking all inputs and do not close program execution abruptly.

Lets say I have to take 4 num inputs from user and at 2 nd input line user enters char then java should take another two inputs and only after that throw an exception

eg: 1 2 @ 4

Number mismatch exception

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