kotlin java.lang.NumberFormatException: For input string: "null"

Question

if (aa.isNullOrBlank() || aa.isEmpty() || aa.isNullOrEmpty()) {//to check null
} else {
    someVar = aa.toInt()
    //here error is showing java.lang.NumberFormatException: For input string: "null"
}

So what is exactly your question?

Michael Rovinsky
– Michael Rovinsky

2021-04-30 06:00:28 +00:00
Commented Apr 30, 2021 at 6:00 — Michael Rovinsky
– Michael Rovinsky, Commented Apr 30, 2021 at 6:00

Yeldar Nurpeissov · Accepted Answer · 2021-04-30 04:58:49Z

2

Before casting into Integer, you have to check if there are only digits. By isDigitsOnly()

if (aa.isNullOrBlank() || 
    aa.isEmpty() || 
    aa.isNullOrEmpty() ||  
    !aa.isDigitsOnly() ||
    aa.toIntOrNull() == null
) {
//to check null
} else {
    arra[i][j] = aa.toInt()
}

answered Apr 30, 2021 at 4:58

Yeldar Nurpeissov

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1 Comment

user3703276 Over a year ago

thank you so much was stuck on the problem for about an hour

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