I made a post on stackoverflow but nobody has helped me.

 

I am supposed to write a program that has a generic method to swap any two variables of any data type.

 

I have this, could anyone help me.

public class GArray <E extends Number> {}

private E[] list;

public GArray()

list = (E[]) new Number[10]

I don't know how to write this. Could anyone tell me how to do this?

Thanks

I made a post on stackoverflow but nobody has helped me.

 

I am supposed to write a program that has a generic method to swap any two variables of any data type.

 

I have this, could anyone help me.

public class GArray <E extends Number> {}

private E[] list;

public GArray()

list = (E[]) new Number[10]

I don't know how to write this. Could anyone tell me how to do this?

Thanks

public static <E> List<E> swapIt(List<E> things, E thing1, E thing2) {
      Collections.swap(things, things.indexOf(thing1), things.indexOf(thing2));
      return things;
}

something like this?

Thank you for your help. This is my second java course and I can tell you I am not taking up programming anymore. Just taking this class to satisfy needs in Information Technology. How would I go about giving it some sample data like int 10 and string tree?

I am almost done with this course thank god. 1 month

i put this in the main

 

swapIt(things, 10, "tree");
//something is wrong

Edited October 28, 20169 yr by Mechagoober

 

Thank you for your help. This is my second java course and I can tell you I am not taking up programming anymore. Just taking this class to satisfy needs in Information Technology. How would I go about giving it some sample data like int 10 and string tree?

I am almost done with this course thank god. 1 month

i put this in the main

 

swapIt(things, 10, "tree");
//something is wrong

 

you're passing two different types. They should both be of 1 type (E)

public static <IIlIiiiIIlII> List<IIlIiiiIIlII> IIIIiiiIIlII (List<IIlIiiiIIlII> IIIIiiiIIlII, IIlIiiiIIlII IIIIiiIIlII, IIlIiiiIIlII IIIIiiIIII) {
     Collections.swap(IIIIiiiIIlII, IIIIiiiIIlII.indexOf(IIIIiiIIlII), IIIIiiiIIlII.indexOf(IIIIiiIIII));
     return IIIIiiiIIlII;
}

just for the sake of it i decided to do this

Edited October 28, 20169 yr by Imateamcape

public class Swap {

    public static List<?> swap(List<?> list, Object a, Object b) {
        List<?> result = new ArrayList<>(list);
        Collections.swap(result, list.indexOf(a), list.indexOf(b));
        return result;

    }

    public static <A, B> Object[] swap(Object[] array, Object a, Object b) {
        return swap(Arrays.asList(array), a , b).toArray();
    }

    /*
    Example
    */
    public static void main(String[] args) {
        Object[] array = new Object[]{1, "two", 3, "four"};
        List<?> list = new ArrayList<>(Arrays.asList(array));
        System.out.println(swap(array, 3, "two"));
        System.out.println(swap(list, "four", 1));
    }

}

yw

Edited November 3, 20169 yr by Botre