MinMaxMeth.java

// GMI-MinMaxMeth/MinMaxMeth.java
 
class MinMaxMeth {
    static <T extends Comparable<T>> T getMax(T[] arr) {
        if (arr == null || arr.length == 0)
            throw new IllegalArgumentException();
        T max = arr[0];
        for (int i = 1; i < arr.length; ++i)
            if (arr[i].compareTo(max) > 0) max = arr[i];
        return max;
    }

    public static void main(String[] args) {
        int mxi = getMax(new Integer[]{3, -2 , -7, 2});
          // one may enforce type to be substituted for T;
          // usually, as here, not needed, as the correct
          // type will be inferred by the compiler anyway
        String mxs = MinMaxMeth.<String>getMax(
                new  String[]{"A", "Z", "C"});

        System.out.println("I - max = " + mxi);
        System.out.println("S - max = " + mxs);
    }
}