Sort Array using an int variable from another class

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Sort Array using an int variable from another class

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#1 by (4 votes)
#2 by (2 votes)

4

I am currently new to this java and I have a question about sorting arrays . I have this code in a previously created class.

public class Orden {

    int value;

    public Orden(){}

    public Orden(int value){

        this.value= value;
    }


    public int getValue() {
        return value;
    }

    public void setValue(int value) {
        this.value = value;
    }

}

Then I have another class with the following:

public class Main {


    public static void main(String[] args) {

        int i;
        int j;
        int aux;
        Orden[] cosa=new Orden[10];

        cosa[1]= new Orden(5);
        cosa[2]= new Orden(9);
        cosa[3]= new Orden(55);
        cosa[4]= new Orden(88);
        cosa[5]= new Orden(44);
        cosa[6]= new Orden(66);
        cosa[7]= new Orden(33);
        cosa[8]= new Orden(33);
        cosa[9]= new Orden(44);
        cosa[0]= new Orden(88);


        for(i=0;i<(cosa.length-1);i++)
        {
            for(j=i+1;j<cosa.length;j++)
            {
                if(cosa[i].getValue()>cosa[j].getValue())
                {
                    aux=cosa[i].getValue();
                    cosa[i]=cosa[j];
                    cosa[j]=aux;
                }
            }
        }


    }

}

But I have an error in the line where cosa[j]=aux; is indicated. According to what I have been able to understand, it is because I am saving an object in a variable int , but I can not see how to save that value in the variable aux . Any recommendation?

java array

asked by Jesus Figuera 06.04.2018 в 07:17

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2 answers

2

You can define aux of type Order and simply make aux=cosa[i]; , it would be logical to exchange the objects of place in the array and not their values.

answered by 06.04.2018 в 08:38

make Javascript work when several events happen When is it better to use LinkedList and when ArrayList.?

score 4 · Accepted Answer

You are using POO , then to assign the value to an attribute you should use the setter defined in your class in this way, plus the attribute should be private and not public .

private int value; // clase Orden

cosa[j].setValue(aux);

But apparently you try to apply the bubble method to order items which is incorrect I recommend reading the documentation on this method. Instead of declaring the temporary variable as a whole (int) declare it of the class type Orden as mentioned @PabloLozano (which in principle I did not take into account)

  int n = cosa.length;
    for (int i = 0; i < n-1; i++){
        for (int j = 0; j < n-i-1; j++){
            if (cosa[j].getValue() > cosa[j+1].getValue()){
                Orden temp = cosa[j];
                cosa[j]= cosa[j+ 1];
                cosa[j+1] = temp;
            }
        }
    }

With Java8 it is easier to Order in the following way. (ascending, if you want descending, change the order p2.getValue () - p1.getValue ()) ;

Arrays.asList(cosa).sort((p1, p2) -> p1.getValue() - p2.getValue());