CODEWITHSUNDEEP
javaactionscript-3arraylist
Ketil Gustavsen
Ketil Gustavsen

Reputation: 3

Getting values from multiple arrayLists in java

i've just recently started with java on my school, and i have a bit of a problem. Well not really a problem, since i've found a way to solve it (complicated one though).

im supposed to make a poemgenerator.

so, in a for loop, i want to build a string, of words that is in some arrayLists, so im using a StringBuilder for that.

the thing is, that my sentence should consists of words from 4 different arrayLists, (different wordclasses)

and, a while ago, i programmed in actionscript3, and there was something there that i could really use for this problem, that would make the code so much simplier. using This[]

so. i have 4 lists: list0, list1, list2, list3

and in my loop, i would've done something like the following in AS3(flash, actionscript3)

for(int i = 0; i<4; i++){
    poem.append(This["list" + i].get(randomindex))
}

so that the first time the loop goes, i get a random word from list0, the second time, i get a random word from list1, and so on... is there any way to do this simple in java? x)

Upvotes: 0

Views: 138

Answers (3)

talex
talex

Reputation: 20544

You can use array;

List<String> list1 = Arrays.asList("String1", "String2");
List<String> list2 = Arrays.asList("String3", "String4");
List<String> list3 = Arrays.asList("String5", "String6");
List<String> list3 = Arrays.asList("String7", "String8");
List<String>[] lists = new List[]{ list1, list2, list3, list4};

Then replace your code with 

for(int i = 0; i<4; i++){
    poem.append(lists[i].get(randomindex));
}

Upvotes: 3

Kent
Kent

Reputation: 195209

Make a fullList : List<List<String>> contains your list0-3

Random r = new Random();
StringBuildr poem = new StringBuilder();
for (List<String> list : fullList)
    poem.append(list.get(r.nextInt(list.size())));

poem.toString(); //this is your poem

codes are not written in IDE, not tested either.

Upvotes: 1

Robert
Robert

Reputation: 1316

You can use a two dimensional array see here

list[0] = {"firstWordA","firstWordB"};
list[1] = {"secondWordA","secondWordB"};
list[2] = {"thirdWordA","thirdWordB"};
list[3] = {"fourthWordA","fourthWordB"};

for(int i = 0; i<4; i++){
    poem.append(list[i][randomindex])
}

Upvotes: 0

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