java方法怎么返回数组

public class JavaTest1
{
public static void main(String[] agrs)
{
int a[][]={{2,1,3,6,9},{27,18,34}};
int b[][];
System.out.println("The array a is");
showArray(a);
b=addArray(a);
System.out.println("The array b is");
showArray(b);
}
public static int[][] addArray(int[][] a)
{
for(int i=0;i<a.length;i++)
{
for(int j=0;j<a[i].length;j++)
{
a[i][j]++;
}
}
return a;
}
public static void showArray(int[][] a)
{
for(int i=0;i<a.length;i++)
{
for(int j=0;j<a[i].length;j++)
{
System.out.print(" "+a[i][j]);
}
System.out.println("");
}
}
}