What does the "Multiple markers" mean?

I am trying to use sets in the following way:

static Set<String> languages = new HashSet<String>();
languages.add("en");
languages.add("de");

And I get the following error message generated by Eclipse:

> Multiple markers at this line
>   - Syntax error on token ""en"", delete this      token
>   - Syntax error on token(s), misplaced    construct(s)

开发者_开发技巧I cannot figure out what I am doing wrong. Can anybody please help me?

"Multiple markers" just means "there's more than one thing wrong with this line".

But the basic problem is that you're trying to insert statements directly into a class, rather than having them in a constructor, method, initializer etc.

I suggest you change your code to something like this:

static Set<String> languages = getDefaultLanguages();

private static Set<String> getDefaultLanguages()
{
    Set<String> ret = new HashSet<String>();
    ret.add("en");
    ret.add("de");
    return ret;
}

You are doing something illegal:

Either this (if your code is at class level):

// field definition on class level
static Set<String> languages = new HashSet<String>();
// statements are not allowed here, the following lines are illegal:
languages.add("en");
languages.add("de");

or this:

private void foo(){
    // static keyword not legal inside methods
    static Set<String> languages = new HashSet<String>();
    languages.add("en");
    languages.add("de");

}

Instead, you could use a static initializer to initialize your set:

static Set<String> languages = new HashSet<String>();
static{
  languages.add("en");
  languages.add("de");
}

This means on a single line you are getting multiple errors.

The pic below describes the best. Refer @Jon Skeet to know how to resolve these errors.