3
How to count how many times an item appears in an Array I don’t know the size of? The array was created from a . CSV.
2 answers
6
I think you can do so, create a method and pass by parameter the Array and the Item to be checked, if it is a String Array for example:
public int contarRepeticoes(String[] array, String valor) {
int contador = 0;
if(array!=null) {
for(int i=0; i<array.length(); i++) {
if(array[i]!=null) {
if(array[i].equals(valor)) {
contador++;
}
}
}
} else {
System.out.println("Vetor nulo");
}
return contador;
}
I think something like this works, no IDE here to test.
5
The code below serves for any type of input data (String, int, double etc):
public static int contaArray(ArrayList<Object> array, Object valorProcurado){
int contador = 0;
if (array != null){
for (Object item : array){
if (item != null && item.equals(valorProcurado)){
contador++;
}
}
}
return contador;
}
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Very good, didn’t know that! But even if it passes a normal array will work?
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@Joãoneto The way it is you can not pass a normal array, but this special "for" also works with arrays, so just change the signature of the method without modifying the content.
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Got it @utluiz. Thanks!
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Considered using a loop
for(Object object : csv)instead of somethingfor(int i = 0; i < csv.length; i++)?– Renan Gomes
If you have an array then you can get its size - just access the property
lengtharray - independent of how the array was created.– carlosfigueira
@user2296455 if the answer has solved your question let us know, if you do not also warn. :)
– João Neto