Java用1D数组填充2D数组

Question

Whats the nicest way to fill up following array:
From main:

String[][] data = new String[x][3]; 

for(int a = 0; a < x; a++){ 
    data[a] = someFunction();
}

Function I am using..:

 public String[] someFunction(){
     String[] out = new String[3];

     return out;
 }

Is it possible to do something like this? Or do I have to fill it with for-loop?

With this code im getting error "non-static method someFunction() cannot be refferenced from static content ---"(netbeans) on line data[a] = someFunction();

Answer 1

You have to specify how many rows your array contains.

String[][] data = new String[n][];

for(int i = 0; i < data.length; i++){
    data[i] = someFunction();
}

Note that someFunction can return arrays of varying lengths.

Of course, your someFunction returns an array of null references, so you still have to initialize the String s of that array in some loop.

I just noticed the error you got. Change your someFunction to be static.

Answer 2

Change your someFunction() by adding "static".

You also should consider using an ArrayList for such tasks, those are dynamic and desinged for your purpose (I guess).

public static void main(String[] args){

    int x = 3;

    String[][] data = new String[x][3]; 

    for(int a = 0; a < x; a++){ 
        data[a] = someFunction();
    }

}

public static String[] someFunction(){
     String[] out = new String[3];
     return out;
 }

Greetings Tim