below is a program that has a bug - it doesn't create an array
before assigning into it (happens in a constructor).
Under 116v4a/glibc, the program says "Can't find class" rather
than printing a nice stacktrace. Under 115v5,7 it sometimes
prints the stacktrace; sometimes the constructor returns
null and no (correct) error is printed.
-----
// 1.1.6v4a calles the parent constructor(shape), then
// says "Can't find class bblobBUG"
// 1.1.5v5 runs, but theShape is printed as null
// search for BUG.
import java.awt.*;
import java.applet.*;
class avector {
avector() { arr = new float[3]; }
float[] arr;
}
abstract class shape
{
static avector p[][];
shape()
{
System.out.println("shape constructor, initializing");
// BUG is here: need p = new avector[2][2]
for( int ir=0; ir < 2; ir++ ) {
for( int it=0; it < 2; it++ ) {
p[ir][it] = new avector();
}
}
}
} //shape
//----------------------------------------------------------------
public class bblobBUG extends java.applet.Applet
{
static class sphere extends shape
{
sphere() {
super();
System.out.println("sphere constructor");
}
} //sphere
//----------------------------------------------------------------
final static int XRES = 300;
final static int YRES = 300;
static shape theShape = new sphere();
//----------------------------------------------------------------
public static void main(String[] args)
{
bblobBUG bb = new bblobBUG();
System.out.println(theShape); // BUG: says "null"
Frame mainFrame = new Frame("bblob");
mainFrame.setSize(XRES, YRES);
mainFrame.add(bb);
mainFrame.show();
} //main
} //bblob
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j.p.lewis [EMAIL PROTECTED]
012 345 6789 //www.idiom.com/~zilla
