Enum in Java

The basic using of Enum should be like following:

public enum SimpleColor {
    RED,
    GREEN,
    BLUE
}

public static void main(String[] args) {
    for (SimpleColor sc : SimpleColor.values()) {
        System.out.println(sc);
    }
}

In addition, you may also using it as following:

public enum ComplexColor {
    RED ("Red", "0XFF0000"),
    GREEN ("Green", "0X00FF00"),
    BLUE ("Blue", "0X0000FF");

    private String title;
    private String rgb;

    ComplexColor(String title, String rgb) {
        this.title = title;
        this.rgb = rgb;
    }

    public String title() {
        return title;
    }

    public String rgb() {
        return rgb;
    }
}

public static void main(String[] args) {
    for (ComplexColor cc : ComplexColor.values()) {
        System.out.println(cc.title() + " - " + cc.rgb());
    }
}

so, you can have more information on it.