Java Month enum

user_9223876 0
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Hi guys I am new to Java so I don't really know much can you help me as simply as possible so this is my code and I got an error about the month(int) so that means it cannot import the library.

public enum Month {
    January(1), February(2), March(3), April(4),May(5),June(6), July(7), August(8), September(9), October(10),  November(11), December(12)
}

ERROR:Description Resource Path Location Type The constructor Month(int) is undefined Month.java /tb00594_comp1027_formative2/src/tb00594_comp1027_formative2 line 4 Java Problem

WARNING:Description Resource Path Location Type Build path specifies execution environment JavaSE-1.7. There are no JREs installed in the workspace that are strictly compatible with this environment. tb00594_comp1027_formative2 Build path JRE System Library Problem

So if you can help me as quickly as possible I would be greatefull.

java
4 Answers

Enum is basically declaration of final set of passible options (in your case months). But it is still Java Class ~ Object.

Your error literally says you are missing constructor for Java Class while you want to give every enumeration certain property. I guess you want to add month order in calendar. All you need to do is just declare property of class and enum constructor.

public enum Month {
    JANUARY(1), FEBRUARY(2), MARCH(3), APRIL(4),MAY(5),JUNE(6), JULY(7), AUGUST(8), SEPTEMBER(9), OCTOBER(10),  NOVEMBER(11), DECEMBER(12);

    private int monthOrder;

    public Month (int monthOrder) {
        this.monthOrder = monthOrder;
    }

    public int getMonthOrder() {
        return this.monthOrder;
    }
 }
user_23807990

You have to write constructor for enum. So you need to implement like this;

public enum Month {
    January(1), February(2), March(3), April(4), May(5), June(6), July(7), August(8), September(9), October(10), November(11), December(12);

    private int value;

    Month(int i) {
        this.value = i;
    }

}

As you can see the constructor ;

Month(int i) {
    this.value = i;
}

which is giving the integer value of related month.And set to value field of enum which is keep the month's value.

user_102884200

The Value you are providing in enum is by default 0, 1,... an so on as in array indexing. If you want to change this, you need to have value integer taken explicitly and add it in constructor as well. Also, to use this value you can have a getter as well.

Try this:

public enum Month {

    January(1),
    February(2),
    March(3),
    April(4),
    May(5),
    June(6),
    July(7),
    August(8),
    September(9),
    October(10),
    November(11),
    December(12);

    private int value;

    Month(int value) {
        this.value = value;
    }

    public int getValue() {
        return value;
    }

}
user_92159100

Add constructor:

public enum Month {
    JANUARY(1), FEBRUARY(2), MARCH(3), APRIL(4), MAY(5), JUNE(6), JULY(7), AUGUST(8), SEPTEMBER(9), OCTOBER(10),  NOVEMBER(11), DECEMBER(12);

    private final int number;

    public Month (int number) {
        this.number = number;
    }

    public int getNumber() {
        return number;
    }
}
user_60664700
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