How to print out from a nested Array List

Question

This is my code so far :

ArrayList<String[]> data = timeTable.getTimeTableData();

    for (int i = 0; i < data.size(); i++){

        for (int j = 0; j < data.get(i).length; j++){
            printWriter.print("Value " + data + "\n");

        }
        //printWriter.print("Length " + data.get(j). + "\n");
    }

I am having an issue to print out the values, I been looking at ways to do it and that's why I am posting here. What I hold in the ArrayList values coming from the database. I am expecting 14 values altogether. I am seeing 14 values in the current out put I get however as you can see its some weird characters.

This is the output I currently get :

Value [[Ljava.lang.String;@15ad30e, [Ljava.lang.String;@2403d547]
Value [[Ljava.lang.String;@15ad30e, [Ljava.lang.String;@2403d547]
Value [[Ljava.lang.String;@15ad30e, [Ljava.lang.String;@2403d547]
Value [[Ljava.lang.String;@15ad30e, [Ljava.lang.String;@2403d547]
Value [[Ljava.lang.String;@15ad30e, [Ljava.lang.String;@2403d547]
Value [[Ljava.lang.String;@15ad30e, [Ljava.lang.String;@2403d547]
Value [[Ljava.lang.String;@15ad30e, [Ljava.lang.String;@2403d547]
Value [[Ljava.lang.String;@15ad30e, [Ljava.lang.String;@2403d547]
Value [[Ljava.lang.String;@15ad30e, [Ljava.lang.String;@2403d547]
Value [[Ljava.lang.String;@15ad30e, [Ljava.lang.String;@2403d547]
Value [[Ljava.lang.String;@15ad30e, [Ljava.lang.String;@2403d547]
Value [[Ljava.lang.String;@15ad30e, [Ljava.lang.String;@2403d547]
Value [[Ljava.lang.String;@15ad30e, [Ljava.lang.String;@2403d547]
Value [[Ljava.lang.String;@15ad30e, [Ljava.lang.String;@2403d547]

Please, can someone guide or help he get the output correct? Thank You :)

Presumably Arrays.toString(data) ? – Nothing Nothing Jul 28 '17 at 19:12 — Nothing Nothing, Jul 28 '17 at 19:12

score 4 · Accepted Answer · answered Jul 28 '17 at 19:13

4

just need to change

printWriter.print("Value " + data + "\n");

for

printWriter.print("Value " + data.get(i)[j] + "\n");

Thats because your dat.get(i) is an array of Strings. And you want to access to the j element of that array.

answered Jul 28 '17 at 19:13

melli-182

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What I am trying to do is to pass the value back from my servelet to javascript. I know I have not mentioned it within my question. This is a snapshot of how my function looks like https://gyazo.com/034eaf2c5043c019454ec2138863d714 – dark_illusion_909099 Jul 28 '17 at 19:24
Would you by any chance know how to pass as a json this value back to javascript – dark_illusion_909099 Jul 28 '17 at 19:25
you can create your own array or object and then for example use JSON.stringify(your_arr); – melli-182 Jul 28 '17 at 19:27
Sorry I didn't understand what you meant ? – dark_illusion_909099 Jul 28 '17 at 19:28
I am already getting it as an array so how would I be able to sent that back to the javascript as a JSON format so I can do other things to it – dark_illusion_909099 Jul 28 '17 at 19:29

How to print out from a nested Array List

1 Answers1