Pass multiple integer value from jni to java

Question

To pass multiple value from jni to java, I pass 2 Integer reference to jni/c, and use SetIntField() to modify the object.

Unfortunately, the 2 value are the same. Lawrence D'Oliveiro explains Integer is not mutable, so we cant change it. I don't know why.

As a workaround, I created my own Integer class:

public class MyInteger {
    int value;

    public MyInteger(int v) {
        value = v;
    }
}

And pass object of this type to jni:

native int do_something(MyInteger p1, MyInteger p2);

It works. I'm curious why Integer doesn't work. Thanks all.

`Integer` is not mutable, yes, so what is the question exactly? If you want something mutable, use an `int[1]` — Samuel Audet, May 19 '12 at 03:04

score 0 · Accepted Answer · answered May 22 '12 at 05:52

0

This issue has no relation with 'immutable object'. The original code using Integer doesn't work is because of autoboxing.

answered May 22 '12 at 05:52

pengguang001

1 Answers1