Sort an Array using Bubble sort, Error- required: variable, found: value

Question

I'm trying to sort an array using Bubble sort, but it won't work. It says 'required: variable, found: value'

Array.java:143: error: unexpected type
temp.get(d) = temp.get(d+1);

^

required: variable
found: value

Array.java:144: error: unexpected type
temp.get(d+1) = swap;

^

required: variable
found: value

So the Main is given, and all I need to do is write this Bubble sort function

This is what I wrote

public static void bubbleSort(Array<Integer> lista){
boolean swapped;
    Array<Integer> temp;
    int n;

    n= temp.size;

    int swap;

     for (int c = 0; c < ( n - 1 ); c++) {
        for (int d = 0; d < n - c - 1; d++) {
            if (temp.get(d) > temp.get(d+1))
            {
                swap = temp.get(d);
                temp.get(d) = temp.get(d+1);
                temp.get(d+1) = swap;
            }
        }
     }
}

And here's the Main that was given

public static void main(String[] args) throws IOException{
    BufferedReader stdin = new BufferedReader( new InputStreamReader(System.in)); 
    String s = stdin.readLine();
    int N = Integer.parseInt(s);
    Array<Integer> niza =new Array<Integer>(N);
    bubbleSort(niza);

    for(int i=0;i<N;i++){
        s = stdin.readLine();
        niza.set(i, Integer.parseInt(s));
    }

    System.out.println(brojDoProsek(niza));
}

How do I fix this error?

You can't assign to a function. You're looking for set().

SLaks
– SLaks

2014-01-07 17:35:06 +00:00
Commented Jan 7, 2014 at 17:35 — SLaks
– SLaks, Commented Jan 7, 2014 at 17:35

JB Nizet · Accepted Answer · 2014-01-07 17:36:37Z

2

Assuming Array is in fact ArrayList, and assuming you want to store the value that is at index d + 1 in the index d, you need

temp.set(d, temp.get(d + 1));

temp.get(d) is not a variable to which you can assign a value. It's an expression returning a value. And you can't assign anything to a value.

answered Jan 7, 2014 at 17:36

JB Nizet

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2 Comments

naou Over a year ago

now there's a problem with n = temp.size; it says Array.java:134: error: variable temp might not have been initialized n= temp.size;

JB Nizet Over a year ago

That's a good thing you get this error: you indeed haven't initialized temp. Do it.

Potanium · Accepted Answer · 2014-01-07 18:42:13Z

0

As the other users have said, you have to use the set() method to change the value stored at an index of your array.

I think you meant to use an ArrayList. If that is the case, then you should be using n = temp.size() instead of n = temp.size to get the length of the list, as size is a method in the ArrayList class.

answered Jan 7, 2014 at 18:42

Potanium

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