Fill specific row in a 2D array Java

Question

i was wondering if we can in java fill a specified case in a 2D array for example

String[][] Dictionary = new String[25][2];
Dictionary[count][] = word.getName();
Dictionary[][count] = word.getHint();

i don't know if am being clear in my question but all what i am searching for is to fill part by part the 2D array not all the row or all the columns

Answer 1

not shure what you are trying, but if you want to fill in whole columns or rows you could do that the following way:

int size=100;
int dest=50; //value of the column/row you want to fill
String[][] Dictionary = new String[size][size];
//LOOP FOR FILLING COLUMN  :
for (int i=0; i< size;i++){
Dictionary[i][dest] = word.getName();
}
//LOOP FOR FILLING ROW :
for (int i=0; i< size;i++){
Dictionary[dest][i] = word.getName();
}

IF you just want to puncutal enter a specific value at a specific index in your array you must fill in your prevered indices in the "breaks":

i=1; //index row
j==1;//index column
Dictionary[i][j] = word.getName();

Answer 2

There is no such thing as a 2D array in Java. Java only has arrays of arrays. So your 2D array is in fact an array of rows. A row being itself an array of Strings. So if you want to replace the third "row" of your array, you would use

dictionary[2] = new String[] {"hello", "world"};

If you want to fill the existing cells of the third row, you would use

dictionary[2][0] = "hello";
dictionary[2][1] = "world";

If you want to fill the second "column" of your array, you would use

dictionary[0][1] = "hello";
dictionary[1][1] = "world";
dictionary[2][1] = "!";
...

Answer 3

I believe you're trying to do something like this.

String[][] dictionary = new String[25][2];
Dictionary[count][0] = word.getName();
Dictionary[count][1] = word.getHint();

Depending on what you're trying to do you might be better off doing this a little differently. For instance if you're storing a collection of names for which you want to lookup a hint then you might want to look at using a map.

Map<String, String> dictionary = new HashMap<String, String>();
dictionary.put(word.getName(), word.getHint());

String hint = dictionary.get("name");

Answer 4

There's a shortcut for filling all the values of a particular row.

-> Arrays.fill(Dictionary[i],"value");

If you want to fill the whole 2D array.

for(String[] array : Dictionary) Arrays.fill(array,"value");

By this logic, you can fill any dimension array instead of iterating and assigning each value.