I would like to know how to return two multidimentional arrays from the same method:
public static arraysReturn() {
int [][] A={{1,2},{2,3},{4,5}};
int [][] B={{1,2},{2,3},{4,5}};
return A,B;
}
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A 3D array, with the first dimension as size 2?JeffHeaton– JeffHeaton2014-09-16 16:07:00 +00:00Commented Sep 16, 2014 at 16:07
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3 Answers
Java does not support returning multiple things at once.
However, you could create a small class that does this:
public class TwoArrays {
public final int[][] A;
public final int[][] B;
public TwoArrays(int[][] A, int[][] B) {
this.A = A;
this.B = B;
}
}
Then make your method like this:
public static TwoArrays arraysreturn() {
int [][] A={{1,2},{2,3},{4,5}};
int [][] B={{1,2},{2,3},{4,5}};
return new TwoArrays(A,B);
}
To access values:
TwoArrays arrays = arraysreturn();
System.out.println(Arrays.toString(arrays.A)); //Due to the way java prints arrays, this is needed, but it isn't a requirement for doing other stuff with the array.
System.out.println(Arrays.toString(arrays.B));
4 Comments
morpheus05
if the fields are public I would recommend to set them "final"
Pokechu22
It depends on what needs to be done. If you wanted to change the value, you could do that. But I'll label them as final to appease you.
Bill K
This is a very good start, I use classes like this with public final variables to group returns quite a bit. The thing is, if you even remotly follow the SRP then those two pieces of data are related and SHOULD be parts of a class. After this keep an eye out for methods that operate only on this data, they should be methods OF your "TwoArrays" class. After a while you make the variables private, rename the class and you have done a fantastic proper OO refactor. This is one of the first steps in really understanding and working towards OO design.
user4047127
I am curious to know how to capture the return values in main method? @Pokechu22
Make one array which contains both arrays. In your case
int[2][][] = {
{{1,2},{2,3},{4,5}},
{{1,2},{2,3},{4,5}}
};
Or better, make an object which contains both arrays.
1 Comment
Bill K
downvote only in that it is a much better idea to add a class, complicating a structure which you have no insight into (from the calling class) is not a good solution. This works but nobody should ever do it.
You can't return multiple values from a method.
You can return a single Object that contains two arrays as members though.
You could also return a multi-dimensional array that contains both arrays, but that's not a very OOP solution.
