Java可选问题,我这样做了吗？

例：

private enum Foo {
    NULL(1,null,2),NOT_NULL(3,new Bar(),4);

    private int a,c;
    private Bar b;

    Foo(int a,Bar b,int c) {
        this.a = a;
        this.b = b;
        this.c = c;
    }
}

所以现在我正在尝试将我的代码转换为使用Optional< T>像每个人都在暗示,但我不确定我是否正确地做到了.

这是我的代码(Trimmed枚举)：

public static enum Difficulty { 
    EASY,MEDIUM,HARD
}

public static enum SlayerTasks {
    NONE(0,Optional.empty(),Optional.empty()),NPC(1,Optional.of(Difficulty.EASY),Optional.of("That one place."),Optional.of(1));

    private int taskId;
    private Optional<Difficulty> difficulty;
    private Optional<String> location;
    private Optional<Integer> npcId;

    SlayerTasks(int taskId,Optional<Difficulty> difficulty,Optional<String> location,Optional<Integer> npcId) {
        this.taskId = taskId;
        this.difficulty = difficulty;
        this.location = location;
        this.npcId = npcId;
    }

    public int getTaskId() {
        return taskId;
    }

    public Difficulty getDifficulty() {
        return difficulty.get();
    }

    public String getLocation() {
        return location.get();
    }

    public int getNpcId() {
        return npcId.get();
    }
}

困扰我的是指向#get()的文档找到here,其中指出：

If a value is present in this Optional,returns the value,otherwise throws NoSuchElementException.

所以,我认为为了防止这种情况,我会将getter包装在#isPresent()中,但后来我无法弄清楚如何返回空.

这是正确的做事方式,还是我错过了什么？我不是在寻找“修复”,我正在寻找有关效率和正确实践的信息.