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Message:

Translating C pointers to Java

Posted by Lutz Ihlenburg on April 20, 2000 at 3:42 AM

Hi all,

with the following attempt to transfer a program I failed. The Java program prints 'null', not 33. Is there a way, which leads to the correct result? But I do not mean programs, which int as return value supplies or which int a into an array of the length one pack. That already occurred to me.
If there is no solution: Why may one make something in Java with arrays, what is forbidden with normal objects?
Best greetings Lutz

/************ C code ************************

int x;

void subprog(int* a)
{
*a = 33;
return;
}

void main(void)
{
subprog(&x);
printf("%d\n", x);
}

************* Faulty Java translation ******/

public class Stupid
{
static Integer x;
static public void a(Integer y)
{
y = new Integer(33);
}
public static void main(String[] args)
{
a(x);
System.out.println(x);
}
}

• Mutable versus Immutable Objects Bill Venners April 23, 2000 at 8:07 PM (3)
  • RE: Mutable versus Immutable Objects Lutz Ihlenburg April 26, 2000 at 9:50 AM (2)
    • Immutables and Multi-valued Returns Bill Venners April 26, 2000 at 1:58 PM (1)
      • Immutables and Multi-valued Returns Lutz Ihlenburg April 28, 2000 at 9:51 AM (0)
• reply just try April 23, 2000 at 6:15 PM (0)