Creating a Copy of a Java Array :: Calling Java from MATLAB (External Interfaces)

External Interfaces

Creating a Copy of a Java Array

You can create an entirely new array from an existing Java array by indexing into the array to describe a block of elements, (or subarray), and assigning this subarray to a variable. The assignment copies the values in the original array to the corresponding cells of the new array.

As with the example in section Creating a New Array Reference, an original array is created and initialized. But, this time, a copy is made of the array contents rather than copying the array reference. Changes made using the reference to the new array do not affect the original.

origArray = javaArray('java.lang.Double', 3, 4);
for m = 1:3
   for n = 1:4
      origArray(m,n) = java.lang.Double((m * 10) + n);
   end
end

origArray
origArray =
java.lang.Double[][]:
    [11]    [12]    [13]    [14]
    [21]    [22]    [23]    [24]
    [31]    [32]    [33]    [34]

%  ----- Make a copy of the array contents -----
newArray = origArray(:,:);
newArray(3,:) = java.lang.Double(0);

origArray
origArray = 
java.lang.Double[][]:
    [11]    [12]    [13]    [14]
    [21]    [22]    [23]    [24]
    [31]    [32]    [33]    [34]

Creating a New Array Reference Passing Data to a Java Method