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Java translation to x10

I was translating a java program to x10 and was running into a few issues that I was wondering if someone could help me translate. here's one java segment i'm trying to translate.

ArrayList<Posting>[] list = new ArrayList[this.V];
for (int k=0; k<this.V; ++k) {
    list[k] = new ArrayList<Posting>();
}

and this is what i did in x10

var list:ArrayList[Posting]=new ArrayList[Posting](this.V);
for (var k:int=0; k<this.V; ++k) {
    list(k)=new ArrayList[Posting]();
}

a string that creates a mess of error statements,

list(k)=new ArrayList[Posting]();

Any suggestions and possibly an explanation of what I am doing wrong?

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2 answers


Consistent with trutheality. You should define it list

as something like Rail[ArrayList[Posting]]

:

var list:Rail[ArrayList[Posting]]=new Rail[ArrayList[Posting]](this.V);


Additionally, since X10 supports type inference for immutable variables, it is often better to use val

instead of var

and omit the type declaration altogether:

val list = new Rail[ArrayList[Posting]](this.V);
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Here's the code that should work for you:

val list = new Rail[ArrayList[Posting]](this.V);
for (k in 1..(this.V)) {
  list(k)=new ArrayList[Posting]();
}

And you can also do



val list = new Rail[ArrayList[Posting]](this.V, (Long)=>new ArrayList[Temp]());

i.e. use one statement to create an initialized array.

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