import java.util.EnumSet;

public class HelloEnumSetJumbo {
	
	public enum Elements {
		H, He, 
		Li, Be, B, C, N, O, F, Ne,
		Na, Mg, Al, Si, P, S, Cl, Ar,
		K, Ca, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, Ge, As, Se, Br, Kr,
		Rb, Sr, Y, Zr, Nb, Mo, Tc, Ru, Rh, Pd, Ag, Cd, In, Sn, Sb, Te, I, Xe,
		Cs, Ba, 
		La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu,	
		Hf, Ta, W, Re, Os, Ir, Pt, Au, Hg, Tl, Pb, Bi, Po, At, Rn,
		Fr, Ra, 
		Ac, Th, Pa, U, Np, Pu, Am, Cm, Bk, Cf, Es, Fm, Md, No, Lr,
		Rf, Db, Sg, Bh, Hs, Mt, Ds, Rg, Cn, Nh, Fl, Mc, Lv, Ts, Og
	}
	
	public static void main(String...args) {
		System.out.println("Hello EnumSet Jumbo!");
		
		EnumSet<Elements> eSet = EnumSet.allOf(Elements.class);
		
		int size = eSet.size();
		
		System.out.println(eSet);	
		System.out.printf("size = %s\n", size);
	}
}

import java.util.EnumSet;

public class HelloEnumSetJumbo {

    public enum Elements {
        H, He, Li, Be, B, C, N, O, F, Ne, Na, Mg, Al, Si, P, S, Cl, Ar, 
        K, Ca, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, Ge, As, Se, 
        Br, Kr, Rb, Sr, Y, Zr, Nb, Mo, Tc, Ru, Rh, Pd, Ag, Cd, In, Sn, 
        Sb, Te, I, Xe, Cs, Ba, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, 
        Ho, Er, Tm, Yb, Lu, Hf, Ta, W, Re, Os, Ir, Pt, Au, Hg, Tl, Pb, 
        Bi, Po, At, Rn, Fr, Ra, Ac, Th, Pa, U, Np, Pu, Am, Cm, Bk, Cf, 
        Es, Fm, Md, No, Lr, Rf, Db, Sg, Bh, Hs, Mt, Ds, Rg, Cn, Nh, 
        Fl, Mc, Lv, Ts, Og
    }

    public static void main(String... args) {
        System.out.println("Hello EnumSet Jumbo!");

        EnumSet<Elements> eSet = EnumSet.allOf(Elements.class);

        int size = eSet.size();

        System.out.println(eSet);
        System.out.printf("size = %s\n", size);
    }
}

Update HelloEnumSetJumbo.java