print array from arrayList in java

Question

i am trying to print arrayList but i am getting something like this.

[[Ljava.lang.String;@506c589e, [Ljava.lang.String;@69d0a921, [Ljava.lang.String;@446cdf90]

I also tried but no result.

Arrays.toString(list.get(0))

Please help.

public ArrayList getByName(String name) {
    try {
        preSt = con.prepareStatement("SELECT * FROM DATA WHERE name=?");
        preSt.setString(1, name);
        rs = preSt.executeQuery();
        ArrayList list = new ArrayList();
        int i = 0;
        while(rs.next()) {
            Object[] temp = new String[3];
            temp[0] = rs.getString("name");
            temp[1] = rs.getString("surname");
            temp[2] = rs.getString("age");
            list.add(i, temp);
            i++;
        }
        System.out.println(list);
        return list;
    } catch (Exception ex) {
        System.out.println("Error: "+ex);
    }
    return null;
}

Patrick Parker · Accepted Answer · 2016-12-03 10:44:33Z

5

Since you are already working with arrays, you may consider this method which will allow you to avoid writing a hand-coded loop:

System.out.println(Arrays.deepToString(list.toArray()));

answered Dec 3, 2016 at 10:44

Patrick Parker

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1 Comment

BARNI Over a year ago

Thank you, this one works too. but i needed to print out arrays separately.

Dawood ibn Kareem · Accepted Answer · 2016-12-03 10:39:18Z

3

The easiest way to print that list is to iterate through it. Remember that each element of that list is itself an array, so you'll need Arrays.toString to print it.

List<Object[]> list = new ArrayList<>();

// populate it in here

for(Object[] array : list) {
    System.out.println(Arrays.toString(array));
}

answered Dec 3, 2016 at 10:39

Dawood ibn Kareem

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2 Comments

BARNI Over a year ago

I tried to run this code when list is returned here is a code which gets it. code public void getNew(List name) { for(Object[] array : name) { System.out.println(Arrays.toString(array)); } } i get error like this code Error:(15, 30) java: incompatible types: java.lang.Object cannot be converted to java.lang.Object[]

Dawood ibn Kareem Over a year ago

That error would only happen if you didn't change the declaration of list, like I've shown on the first line of code in my answer.

JRA · Accepted Answer · 2016-12-03 10:40:31Z

-1

You can try this

public ArrayList getByName(String name) {
    try {
        preSt = con.prepareStatement("SELECT * FROM DATA WHERE name=?");
        preSt.setString(1, name);
        rs = preSt.executeQuery();
        ArrayList list = new ArrayList();
        int i = 0;
        while(rs.next()) {
            Object[] temp = new String[3];
            temp[0] = rs.getString("name");
            temp[1] = rs.getString("surname");
            temp[2] = rs.getString("age");
            list.add(i, temp);
            i++;
        }
        for(int i=0;i<list.size();i++){
            System.out.println(list[i]);
        }
        return list;
    } catch (Exception ex) {
        System.out.println("Error: "+ex);
    }
    return null;
}

answered Dec 3, 2016 at 10:40

JRA

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5 Comments

BARNI Over a year ago

i tried this one and gor err like this Error:(63, 40) java: array required, but java.util.ArrayList<java.lang.Object> found

Dawood ibn Kareem Over a year ago

This won't fix the problem. Did you actually try it?

denvercoder9 Over a year ago

list is an ArrayList. You can't access elements using [] like an array.

JRA Over a year ago

Then u can you map instead of list.Because you are adding twom paramter so go with map like this

JRA Over a year ago

Map<int,object> map = new HashMap<int,object>();

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