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Ricardo Sauceda
Asked: 2020-09-28 20:29:24 +0800 CST 2020-09-28 20:29:24 +0800 CST

How to convert String rest = "1,2,3"; in an array of integers in JAVA?

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good night!

I have three stringsString cosa1 = request.getParameter("cosa1").toString(); -> SALIDAS con números aleatorios (**LOS NÚMEROS SON IDS DE PRODUCTOS**): 4,3 - 3,4,5 - 1,5,4

I want to pass that data to three INT arrays in Java, I try this and it doesn't work:

String cosa1 = request.getParameter("cosa1").toString();
String cosa2 = request.getParameter("cosa2").toString();
String cosa3 = request.getParameter("cosa3").toString();
int cosa_1 = Integer.parseInt("cosa1");
int cosa_2 = Integer.parseInt("cosa2");
int cosa_3 = Integer.parseInt("cosa3");

It sends me the following error:

org.apache.jasper.JasperException: Ha sucedido una excepción al procesar la página JSP /registro/18-paso-23.jsp en línea 35

32:             String cosa1 = request.getParameter("cosa1").toString();
33:             String cosa2 = request.getParameter("cosa2").toString();
34:             String cosa3 = request.getParameter("cosa3").toString();
35:             int cosa_1 = Integer.parseInt("cosa1");
36:             int cosa_2 = Integer.parseInt("cosa2");
37:             int cosa_3 = Integer.parseInt("cosa3");

I hope you can help me, I already tried and I can't get my array of integers.

java

1 Answers

  1. Best Answer

    If the string has bad values ​​like the , to make castsure you'll get a NumberFormatExceptionas seems to be your case.

    To convert a arrayfrom integers there can be many ways but I will show two, iteratively and with Streams (you must replace the variable a in by thing1, thing2, etc) also with the regular expression we avoid spaces, letters.

    String a = "1,2,3,4,7,a,7,, ,,";
String[] digitos =  a.split("\\D+"); //
int[] resultado = new int[digitos.length];
for (int i = 0; i < resultado.length; i++) {
    resultado[i] = Integer.parseInt(digitos[i].trim());
}

System.out.println(Arrays.toString(resultado));

    Departure

    [1, 2, 3, 4, 7, 7]

    Streams

    int[] resultado= Stream.of(a.split("\\D+")).mapToInt(Integer::parseInt).toArray();
System.out.println(Arrays.toString(resultado));
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