Get SizeOf

gistfile1.java

package methods;

public class GetSize {
    public static void main(String[] args) {
        Byte[] b = {1};
        Short[] s = {2, 2};
        Integer[] i = {3, 3, 3};
        Long[] l = {4l, 4l, 4l, 4l};
        Float[] f = {5f, 5f, 5f, 5f, 5f};
        Double[] d = {6d, 6d, 6d, 6d, 6d, 6d};

        System.out.println(getArrSize(b));
        System.out.println(getArrSize(s));
        System.out.println(getArrSize(i));
        System.out.println(getArrSize(l));
        System.out.println(getArrSize(f));
        System.out.println(getArrSize(d));
    }

    private static <T> byte getArrSize(T[] arr) {
        if (arr.length <= 0) {
            return 0;
        }
        return (byte)(sizeof(arr[0])*arr.length);
    }

    private static byte sizeof(byte b) { return 1; }
    private static byte sizeof(short s) { return 2; }
    private static byte sizeof(int i) { return 4; }
    private static byte sizeof(long l) { return 8; }
    private static byte sizeof(float f) { return 4; }
    private static byte sizeof(double d) { return 8; }
    private static byte sizeof(Object o) {
        switch (o.getClass().getName()) {
            case "java.lang.Byte":
                return 1;
            case "java.lang.Short":
                return 2;
            case "java.lang.Integer":
                return 4;
            case "java.lang.Long":
                return 8;
            case "java.lang.Float":
                return 4;
            case "java.lang.Double":
                return 8;
        }
        return 0;
    }
}