import java.util.Random;
/***********************
 * @author gTowell 
 * Created: August 28, 2019 
 * Modified: August 29, 2019 
 * 
 * Purpose:
 * Generic Methods
 ***********************/
public class GenericMethod {
    public static void main(String[] args) {
        Integer[] jj = { 1, 2, 3, 4, 5, 6, 7, 8, 9 }; // NOTE AUTOBOXING!!!
        new GenericMethod().randomize(jj);
        for (int j : jj)
            System.out.println(j);
        String[] ss = { "A", "B", "c", "d", "E", "F" };
        new GenericMethod().randomize(ss);
        for (String s : ss)
            System.out.println(s);
    }

    /**
     * Generic method to randomize  list
     * @param <T>
     * @param data the data (of Type T) to be randomized
     */
    public <T> void randomize(T[] data) {
        Random r = new Random();
        for (int i = 0; i < data.length; i++) {
            int tgt = r.nextInt(data.length);
            swap(data, i, tgt);
        }
    }

    /**
     * Generic swap function.  From within the passed array, swap the location of the dat items at locA and locB
     * @param <W> Note here that although swap is called from randomized, the naming of the type does not have to match
     * That is, it is T in randomize and W here. 
     * @param data the data (of type W) to be worked on
     * @param locA the first location in the array
     * @param locB the second location in the array
     */
    public <W> void swap(W[] data, int locA, int locB) {
        W temp = data[locA];
        data[locA]=data[locB];
        data[locB]=temp;
    }

    /**
     * Question from class, can you have a generic method with two generic classes.  Answer yes. As here. Also 3, 4, ...  
     * @param <S>
     * @param <T>
     * @param ess
     * @param tee
     */
    public <S, T> void twoGenericMethod(S ess, T tee)
    {
        System.out.println(ess + " " + tee);
    }

}