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AGeekM
Asked: 2020-10-23 02:26:56 +0800 CST 2020-10-23 02:26:56 +0800 CST

Return value of a vector in java

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Hi, it may seem like a silly question but I am creating a method that passes an integer as a parameter and when it matches the position of a vector, it returns the value in that position. What would be the correct syntax? Thanks in advance.

java

1 Answers

  1. Best Answer

    First you must verify that the integer value that your method receives is less than the length of the vector, if it is, you proceed to return the value of the vector using that number received as an index

    private int devuelveNum( int numeroRecibido ){
     if(numeroRecibido < mivector.length){
          return mivector[numeroRecibido];
     }
     return null;
}

    The condition must be numeroRecibido < mivector.lengthbecause you must remember that mivector.lengthit will return the number of objects in the vector, 8 for example. But the indices start from 0, so the index of the last object will be 7.

       0       1      2     3      4      5      6      7        índice
| ojb1 | obj2 | obj3 | obj4 | obj5 | obj6 | obj7 | obj8 |    vector de objetos

    If you receive a parameter 8 and do mivector[8]it will look at index 8 which does not exist. You will receive an index out of range exception.

    The latter returnis because all paths in a code must return something in a function.

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